From 4ee0df8c466861bcd258ec55b58283f276d3b3d5 Mon Sep 17 00:00:00 2001
From: qiulaidongfeng <2645477756@qq.com>
Date: Sat, 26 Jul 2025 16:46:22 +0800
Subject: [PATCH] cmd: remove dead code

Fixes #74076

Change-Id: Icc67b3d4e342f329584433bd1250c56ae8f5a73d
Reviewed-on: https://go-review.googlesource.com/c/go/+/690635
Reviewed-by: Alan Donovan <adonovan@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Commit-Queue: Alan Donovan <adonovan@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
Auto-Submit: Alan Donovan <adonovan@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
---
 src/cmd/asm/internal/arch/loong64.go          |  12 --
 src/cmd/asm/internal/asm/asm.go               |   8 -
 src/cmd/compile/internal/importer/support.go  | 108 ----------
 src/cmd/compile/internal/inline/inl.go        |  11 --
 .../internal/inline/inlheur/scoring.go        |   8 -
 src/cmd/compile/internal/ir/copy.go           |   9 -
 src/cmd/compile/internal/ir/mini.go           |   9 -
 src/cmd/compile/internal/ir/visit.go          |  13 --
 src/cmd/compile/internal/noder/posmap.go      |   1 -
 src/cmd/compile/internal/noder/reader.go      |  11 --
 src/cmd/compile/internal/noder/writer.go      |   5 -
 .../compile/internal/reflectdata/reflect.go   |   7 -
 .../compile/internal/ssa/biasedsparsemap.go   |   8 -
 src/cmd/compile/internal/ssa/debug.go         |   4 -
 src/cmd/compile/internal/ssa/expand_calls.go  |  55 ------
 src/cmd/compile/internal/ssa/prove.go         |   5 +-
 src/cmd/compile/internal/ssa/regalloc.go      |   5 -
 src/cmd/compile/internal/ssa/rewrite.go       |  68 -------
 src/cmd/compile/internal/ssagen/ssa.go        |  23 ---
 src/cmd/compile/internal/syntax/printer.go    |   4 -
 src/cmd/compile/internal/typecheck/iexport.go |  20 --
 src/cmd/compile/internal/typecheck/stmt.go    |   3 -
 src/cmd/compile/internal/types/type.go        |   7 -
 src/cmd/compile/internal/types2/api.go        |   4 -
 .../internal/types2/compilersupport.go        |   6 -
 src/cmd/dist/imports.go                       |  12 --
 src/cmd/dist/util.go                          |  10 -
 src/cmd/go/internal/gover/toolchain.go        |  10 -
 .../lockedfile/internal/filelock/filelock.go  |   8 -
 src/cmd/go/internal/modfetch/codehost/git.go  |  17 --
 src/cmd/go/internal/modfetch/coderepo.go      |   4 -
 src/cmd/go/internal/modindex/build.go         | 187 ------------------
 src/cmd/go/internal/modindex/read.go          |   5 -
 src/cmd/go/internal/modload/buildlist.go      |   5 -
 src/cmd/go/internal/modload/init.go           |  24 ---
 src/cmd/go/internal/work/gc.go                |  27 ---
 src/cmd/internal/archive/archive.go           |  14 --
 src/cmd/internal/gcprog/gcprog.go             |  49 -----
 src/cmd/internal/goobj/objfile.go             |  18 --
 src/cmd/internal/obj/arm64/asm7.go            |  13 --
 src/cmd/internal/obj/loong64/asm.go           |   4 -
 src/cmd/internal/obj/loong64/obj.go           |   8 -
 src/cmd/internal/obj/ppc64/asm9.go            |   4 -
 src/cmd/internal/obj/riscv/obj.go             |  18 --
 src/cmd/internal/obj/s390x/asmz.go            | 101 ----------
 src/cmd/internal/obj/x86/asm6.go              |  17 --
 src/cmd/internal/obj/x86/obj6.go              |   5 -
 src/cmd/internal/robustio/robustio.go         |  14 --
 src/cmd/internal/script/engine.go             |   8 -
 src/cmd/link/internal/amd64/asm.go            |   4 -
 src/cmd/link/internal/ld/decodesym.go         |  29 ---
 src/cmd/trace/viewer.go                       |   5 -
 52 files changed, 1 insertion(+), 1033 deletions(-)

diff --git a/src/cmd/asm/internal/arch/loong64.go b/src/cmd/asm/internal/arch/loong64.go
index bf5175f4a0..21263d3433 100644
--- a/src/cmd/asm/internal/arch/loong64.go
+++ b/src/cmd/asm/internal/arch/loong64.go
@@ -23,18 +23,6 @@ func jumpLoong64(word string) bool {
 	return false
 }
 
-// IsLoong64MUL reports whether the op (as defined by an loong64.A* constant) is
-// one of the MUL/DIV/REM instructions that require special handling.
-func IsLoong64MUL(op obj.As) bool {
-	switch op {
-	case loong64.AMUL, loong64.AMULU, loong64.AMULV, loong64.AMULVU,
-		loong64.ADIV, loong64.ADIVU, loong64.ADIVV, loong64.ADIVVU,
-		loong64.AREM, loong64.AREMU, loong64.AREMV, loong64.AREMVU:
-		return true
-	}
-	return false
-}
-
 // IsLoong64RDTIME reports whether the op (as defined by an loong64.A*
 // constant) is one of the RDTIMELW/RDTIMEHW/RDTIMED instructions that
 // require special handling.
diff --git a/src/cmd/asm/internal/asm/asm.go b/src/cmd/asm/internal/asm/asm.go
index 9a6e22cab2..6bdbcb9c1b 100644
--- a/src/cmd/asm/internal/asm/asm.go
+++ b/src/cmd/asm/internal/asm/asm.go
@@ -974,14 +974,6 @@ func (p *Parser) getConstant(prog *obj.Prog, op obj.As, addr *obj.Addr) int64 {
 	return addr.Offset
 }
 
-// getImmediate checks that addr represents an immediate constant and returns its value.
-func (p *Parser) getImmediate(prog *obj.Prog, op obj.As, addr *obj.Addr) int64 {
-	if addr.Type != obj.TYPE_CONST || addr.Name != 0 || addr.Reg != 0 || addr.Index != 0 {
-		p.errorf("%s: expected immediate constant; found %s", op, obj.Dconv(prog, addr))
-	}
-	return addr.Offset
-}
-
 // getRegister checks that addr represents a register and returns its value.
 func (p *Parser) getRegister(prog *obj.Prog, op obj.As, addr *obj.Addr) int16 {
 	if addr.Type != obj.TYPE_REG || addr.Offset != 0 || addr.Name != 0 || addr.Index != 0 {
diff --git a/src/cmd/compile/internal/importer/support.go b/src/cmd/compile/internal/importer/support.go
index a443b4d862..6ce721557a 100644
--- a/src/cmd/compile/internal/importer/support.go
+++ b/src/cmd/compile/internal/importer/support.go
@@ -9,20 +9,14 @@ package importer
 import (
 	"cmd/compile/internal/base"
 	"cmd/compile/internal/types2"
-	"fmt"
 	"go/token"
 	"internal/pkgbits"
-	"sync"
 )
 
 func assert(p bool) {
 	base.Assert(p)
 }
 
-func errorf(format string, args ...interface{}) {
-	panic(fmt.Sprintf(format, args...))
-}
-
 const deltaNewFile = -64 // see cmd/compile/internal/gc/bexport.go
 
 // Synthesize a token.Pos
@@ -31,108 +25,6 @@ type fakeFileSet struct {
 	files map[string]*token.File
 }
 
-func (s *fakeFileSet) pos(file string, line, column int) token.Pos {
-	// TODO(mdempsky): Make use of column.
-
-	// Since we don't know the set of needed file positions, we
-	// reserve maxlines positions per file.
-	const maxlines = 64 * 1024
-	f := s.files[file]
-	if f == nil {
-		f = s.fset.AddFile(file, -1, maxlines)
-		s.files[file] = f
-		// Allocate the fake linebreak indices on first use.
-		// TODO(adonovan): opt: save ~512KB using a more complex scheme?
-		fakeLinesOnce.Do(func() {
-			fakeLines = make([]int, maxlines)
-			for i := range fakeLines {
-				fakeLines[i] = i
-			}
-		})
-		f.SetLines(fakeLines)
-	}
-
-	if line > maxlines {
-		line = 1
-	}
-
-	// Treat the file as if it contained only newlines
-	// and column=1: use the line number as the offset.
-	return f.Pos(line - 1)
-}
-
-var (
-	fakeLines     []int
-	fakeLinesOnce sync.Once
-)
-
-func chanDir(d int) types2.ChanDir {
-	// tag values must match the constants in cmd/compile/internal/gc/go.go
-	switch d {
-	case 1 /* Crecv */ :
-		return types2.RecvOnly
-	case 2 /* Csend */ :
-		return types2.SendOnly
-	case 3 /* Cboth */ :
-		return types2.SendRecv
-	default:
-		errorf("unexpected channel dir %d", d)
-		return 0
-	}
-}
-
-var predeclared = []types2.Type{
-	// basic types
-	types2.Typ[types2.Bool],
-	types2.Typ[types2.Int],
-	types2.Typ[types2.Int8],
-	types2.Typ[types2.Int16],
-	types2.Typ[types2.Int32],
-	types2.Typ[types2.Int64],
-	types2.Typ[types2.Uint],
-	types2.Typ[types2.Uint8],
-	types2.Typ[types2.Uint16],
-	types2.Typ[types2.Uint32],
-	types2.Typ[types2.Uint64],
-	types2.Typ[types2.Uintptr],
-	types2.Typ[types2.Float32],
-	types2.Typ[types2.Float64],
-	types2.Typ[types2.Complex64],
-	types2.Typ[types2.Complex128],
-	types2.Typ[types2.String],
-
-	// basic type aliases
-	types2.Universe.Lookup("byte").Type(),
-	types2.Universe.Lookup("rune").Type(),
-
-	// error
-	types2.Universe.Lookup("error").Type(),
-
-	// untyped types
-	types2.Typ[types2.UntypedBool],
-	types2.Typ[types2.UntypedInt],
-	types2.Typ[types2.UntypedRune],
-	types2.Typ[types2.UntypedFloat],
-	types2.Typ[types2.UntypedComplex],
-	types2.Typ[types2.UntypedString],
-	types2.Typ[types2.UntypedNil],
-
-	// package unsafe
-	types2.Typ[types2.UnsafePointer],
-
-	// invalid type
-	types2.Typ[types2.Invalid], // only appears in packages with errors
-
-	// used internally by gc; never used by this package or in .a files
-	// not to be confused with the universe any
-	anyType{},
-
-	// comparable
-	types2.Universe.Lookup("comparable").Type(),
-
-	// "any" has special handling: see usage of predeclared.
-}
-
 type anyType struct{}
 
 func (t anyType) Underlying() types2.Type { return t }
diff --git a/src/cmd/compile/internal/inline/inl.go b/src/cmd/compile/internal/inline/inl.go
index c06f76fe9f..b39710548e 100644
--- a/src/cmd/compile/internal/inline/inl.go
+++ b/src/cmd/compile/internal/inline/inl.go
@@ -1211,17 +1211,6 @@ func pruneUnusedAutos(ll []*ir.Name, vis *hairyVisitor) []*ir.Name {
 	return s
 }
 
-// numNonClosures returns the number of functions in list which are not closures.
-func numNonClosures(list []*ir.Func) int {
-	count := 0
-	for _, fn := range list {
-		if fn.OClosure == nil {
-			count++
-		}
-	}
-	return count
-}
-
 func doList(list []ir.Node, do func(ir.Node) bool) bool {
 	for _, x := range list {
 		if x != nil {
diff --git a/src/cmd/compile/internal/inline/inlheur/scoring.go b/src/cmd/compile/internal/inline/inlheur/scoring.go
index 28fa643132..1396c4d800 100644
--- a/src/cmd/compile/internal/inline/inlheur/scoring.go
+++ b/src/cmd/compile/internal/inline/inlheur/scoring.go
@@ -399,14 +399,6 @@ func LargestNegativeScoreAdjustment(fn *ir.Func, props *FuncProps) int {
 	return score
 }
 
-// LargestPositiveScoreAdjustment tries to estimate the largest possible
-// positive score adjustment that could be applied to a given callsite.
-// At the moment we don't have very many positive score adjustments, so
-// this is just hard-coded, not table-driven.
-func LargestPositiveScoreAdjustment(fn *ir.Func) int {
-	return adjValues[panicPathAdj] + adjValues[initFuncAdj]
-}
-
 // callSiteTab contains entries for each call in the function
 // currently being processed by InlineCalls; this variable will either
 // be set to 'cstabCache' below (for non-inlinable routines) or to the
diff --git a/src/cmd/compile/internal/ir/copy.go b/src/cmd/compile/internal/ir/copy.go
index d30f7bc688..4ec887d397 100644
--- a/src/cmd/compile/internal/ir/copy.go
+++ b/src/cmd/compile/internal/ir/copy.go
@@ -32,12 +32,3 @@ func DeepCopy(pos src.XPos, n Node) Node {
 	}
 	return edit(n)
 }
-
-// DeepCopyList returns a list of deep copies (using DeepCopy) of the nodes in list.
-func DeepCopyList(pos src.XPos, list []Node) []Node {
-	var out []Node
-	for _, n := range list {
-		out = append(out, DeepCopy(pos, n))
-	}
-	return out
-}
diff --git a/src/cmd/compile/internal/ir/mini.go b/src/cmd/compile/internal/ir/mini.go
index 70897fc3f9..6c91560e52 100644
--- a/src/cmd/compile/internal/ir/mini.go
+++ b/src/cmd/compile/internal/ir/mini.go
@@ -34,15 +34,6 @@ type miniNode struct {
 	esc  uint16
 }
 
-// posOr returns pos if known, or else n.pos.
-// For use in DeepCopy.
-func (n *miniNode) posOr(pos src.XPos) src.XPos {
-	if pos.IsKnown() {
-		return pos
-	}
-	return n.pos
-}
-
 // op can be read, but not written.
 // An embedding implementation can provide a SetOp if desired.
 // (The panicking SetOp is with the other panics below.)
diff --git a/src/cmd/compile/internal/ir/visit.go b/src/cmd/compile/internal/ir/visit.go
index 8dff11af33..c68bb5d033 100644
--- a/src/cmd/compile/internal/ir/visit.go
+++ b/src/cmd/compile/internal/ir/visit.go
@@ -155,19 +155,6 @@ func Any(n Node, cond func(Node) bool) bool {
 	return do(n)
 }
 
-// AnyList calls Any(x, cond) for each node x in the list, in order.
-// If any call returns true, AnyList stops and returns true.
-// Otherwise, AnyList returns false after calling Any(x, cond)
-// for every x in the list.
-func AnyList(list Nodes, cond func(Node) bool) bool {
-	for _, x := range list {
-		if Any(x, cond) {
-			return true
-		}
-	}
-	return false
-}
-
 // EditChildren edits the child nodes of n, replacing each child x with edit(x).
 //
 // Note that EditChildren(n, edit) only calls edit(x) for n's immediate children.
diff --git a/src/cmd/compile/internal/noder/posmap.go b/src/cmd/compile/internal/noder/posmap.go
index 439daf454e..9b02765e95 100644
--- a/src/cmd/compile/internal/noder/posmap.go
+++ b/src/cmd/compile/internal/noder/posmap.go
@@ -23,7 +23,6 @@ type poser interface{ Pos() syntax.Pos }
 type ender interface{ End() syntax.Pos }
 
 func (m *posMap) pos(p poser) src.XPos { return m.makeXPos(p.Pos()) }
-func (m *posMap) end(p ender) src.XPos { return m.makeXPos(p.End()) }
 
 func (m *posMap) makeXPos(pos syntax.Pos) src.XPos {
 	// Predeclared objects (e.g., the result parameter for error.Error)
diff --git a/src/cmd/compile/internal/noder/reader.go b/src/cmd/compile/internal/noder/reader.go
index 38b0bc1d8a..3cbc7989a7 100644
--- a/src/cmd/compile/internal/noder/reader.go
+++ b/src/cmd/compile/internal/noder/reader.go
@@ -3681,17 +3681,6 @@ func expandInline(fn *ir.Func, pri pkgReaderIndex) {
 	typecheck.Target.Funcs = typecheck.Target.Funcs[:topdcls]
 }
 
-// usedLocals returns a set of local variables that are used within body.
-func usedLocals(body []ir.Node) ir.NameSet {
-	var used ir.NameSet
-	ir.VisitList(body, func(n ir.Node) {
-		if n, ok := n.(*ir.Name); ok && n.Op() == ir.ONAME && n.Class == ir.PAUTO {
-			used.Add(n)
-		}
-	})
-	return used
-}
-
 // @@@ Method wrappers
 //
 // Here we handle constructing "method wrappers," alternative entry
diff --git a/src/cmd/compile/internal/noder/writer.go b/src/cmd/compile/internal/noder/writer.go
index dd79c3ef4c..baff0ceea0 100644
--- a/src/cmd/compile/internal/noder/writer.go
+++ b/src/cmd/compile/internal/noder/writer.go
@@ -2413,11 +2413,6 @@ func (p posVar) String() string {
 	return p.pos.String() + ":" + p.var_.String()
 }
 
-func (w *writer) exprList(expr syntax.Expr) {
-	w.Sync(pkgbits.SyncExprList)
-	w.exprs(syntax.UnpackListExpr(expr))
-}
-
 func (w *writer) exprs(exprs []syntax.Expr) {
 	w.Sync(pkgbits.SyncExprs)
 	w.Len(len(exprs))
diff --git a/src/cmd/compile/internal/reflectdata/reflect.go b/src/cmd/compile/internal/reflectdata/reflect.go
index 4d1d780190..c561d527a7 100644
--- a/src/cmd/compile/internal/reflectdata/reflect.go
+++ b/src/cmd/compile/internal/reflectdata/reflect.go
@@ -1468,10 +1468,3 @@ func MarkUsedIfaceMethod(n *ir.CallExpr) {
 		Add:  InterfaceMethodOffset(ityp, midx),
 	})
 }
-
-func deref(t *types.Type) *types.Type {
-	if t.IsPtr() {
-		return t.Elem()
-	}
-	return t
-}
diff --git a/src/cmd/compile/internal/ssa/biasedsparsemap.go b/src/cmd/compile/internal/ssa/biasedsparsemap.go
index 3032309b7a..25fbaf6862 100644
--- a/src/cmd/compile/internal/ssa/biasedsparsemap.go
+++ b/src/cmd/compile/internal/ssa/biasedsparsemap.go
@@ -84,14 +84,6 @@ func (s *biasedSparseMap) getEntry(i int) (x uint, v int32) {
 	return
 }
 
-// add inserts x->0 into s, provided that x is in the range of keys stored in s.
-func (s *biasedSparseMap) add(x uint) {
-	if int(x) < s.first || int(x) >= s.cap() {
-		return
-	}
-	s.s.set(ID(int(x)-s.first), 0)
-}
-
 // add inserts x->v into s, provided that x is in the range of keys stored in s.
 func (s *biasedSparseMap) set(x uint, v int32) {
 	if int(x) < s.first || int(x) >= s.cap() {
diff --git a/src/cmd/compile/internal/ssa/debug.go b/src/cmd/compile/internal/ssa/debug.go
index e92b37fb7b..c9a3e4291c 100644
--- a/src/cmd/compile/internal/ssa/debug.go
+++ b/src/cmd/compile/internal/ssa/debug.go
@@ -77,10 +77,6 @@ func (ls *liveSlot) String() string {
 	return fmt.Sprintf("0x%x.%d.%d", ls.Registers, ls.stackOffsetValue(), int32(ls.StackOffset)&1)
 }
 
-func (ls liveSlot) absent() bool {
-	return ls.Registers == 0 && !ls.onStack()
-}
-
 // StackOffset encodes whether a value is on the stack and if so, where.
 // It is a 31-bit integer followed by a presence flag at the low-order
 // bit.
diff --git a/src/cmd/compile/internal/ssa/expand_calls.go b/src/cmd/compile/internal/ssa/expand_calls.go
index 30606bb805..1730dbf53d 100644
--- a/src/cmd/compile/internal/ssa/expand_calls.go
+++ b/src/cmd/compile/internal/ssa/expand_calls.go
@@ -851,27 +851,6 @@ func (c *registerCursor) plus(regWidth Abi1RO) registerCursor {
 	return rc
 }
 
-// at returns the register cursor for component i of t, where the first
-// component is numbered 0.
-func (c *registerCursor) at(t *types.Type, i int) registerCursor {
-	rc := *c
-	if i == 0 || len(c.regs) == 0 {
-		return rc
-	}
-	if t.IsArray() {
-		w := c.config.NumParamRegs(t.Elem())
-		rc.nextSlice += Abi1RO(i * w)
-		return rc
-	}
-	if t.IsStruct() {
-		for j := 0; j < i; j++ {
-			rc.next(t.FieldType(j))
-		}
-		return rc
-	}
-	panic("Haven't implemented this case yet, do I need to?")
-}
-
 func (c *registerCursor) init(regs []abi.RegIndex, info *abi.ABIParamResultInfo, result *[]*Value, storeDest *Value, storeOffset int64) {
 	c.regs = regs
 	c.nextSlice = 0
@@ -930,17 +909,6 @@ type expandState struct {
 	indentLevel     int               // Indentation for debugging recursion
 }
 
-// intPairTypes returns the pair of 32-bit int types needed to encode a 64-bit integer type on a target
-// that has no 64-bit integer registers.
-func (x *expandState) intPairTypes(et types.Kind) (tHi, tLo *types.Type) {
-	tHi = x.typs.UInt32
-	if et == types.TINT64 {
-		tHi = x.typs.Int32
-	}
-	tLo = x.typs.UInt32
-	return
-}
-
 // offsetFrom creates an offset from a pointer, simplifying chained offsets and offsets from SP
 func (x *expandState) offsetFrom(b *Block, from *Value, offset int64, pt *types.Type) *Value {
 	ft := from.Type
@@ -964,29 +932,6 @@ func (x *expandState) offsetFrom(b *Block, from *Value, offset int64, pt *types.
 	return b.NewValue1I(from.Pos.WithNotStmt(), OpOffPtr, pt, offset, from)
 }
 
-func (x *expandState) regWidth(t *types.Type) Abi1RO {
-	return Abi1RO(x.f.ABI1.NumParamRegs(t))
-}
-
-// regOffset returns the register offset of the i'th element of type t
-func (x *expandState) regOffset(t *types.Type, i int) Abi1RO {
-	// TODO maybe cache this in a map if profiling recommends.
-	if i == 0 {
-		return 0
-	}
-	if t.IsArray() {
-		return Abi1RO(i) * x.regWidth(t.Elem())
-	}
-	if t.IsStruct() {
-		k := Abi1RO(0)
-		for j := 0; j < i; j++ {
-			k += x.regWidth(t.FieldType(j))
-		}
-		return k
-	}
-	panic("Haven't implemented this case yet, do I need to?")
-}
-
 // prAssignForArg returns the ABIParamAssignment for v, assumed to be an OpArg.
 func (x *expandState) prAssignForArg(v *Value) *abi.ABIParamAssignment {
 	if v.Op != OpArg {
diff --git a/src/cmd/compile/internal/ssa/prove.go b/src/cmd/compile/internal/ssa/prove.go
index be70226695..3f85bd2351 100644
--- a/src/cmd/compile/internal/ssa/prove.go
+++ b/src/cmd/compile/internal/ssa/prove.go
@@ -145,10 +145,7 @@ func (l limit) signedMin(m int64) limit {
 	l.min = max(l.min, m)
 	return l
 }
-func (l limit) signedMax(m int64) limit {
-	l.max = min(l.max, m)
-	return l
-}
+
 func (l limit) signedMinMax(minimum, maximum int64) limit {
 	l.min = max(l.min, minimum)
 	l.max = min(l.max, maximum)
diff --git a/src/cmd/compile/internal/ssa/regalloc.go b/src/cmd/compile/internal/ssa/regalloc.go
index fb9642cfed..c0881c7a45 100644
--- a/src/cmd/compile/internal/ssa/regalloc.go
+++ b/src/cmd/compile/internal/ssa/regalloc.go
@@ -2980,11 +2980,6 @@ type desiredStateEntry struct {
 	regs [4]register
 }
 
-func (d *desiredState) clear() {
-	d.entries = d.entries[:0]
-	d.avoid = 0
-}
-
 // get returns a list of desired registers for value vid.
 func (d *desiredState) get(vid ID) [4]register {
 	for _, e := range d.entries {
diff --git a/src/cmd/compile/internal/ssa/rewrite.go b/src/cmd/compile/internal/ssa/rewrite.go
index 87f7b517c2..03b1e39b74 100644
--- a/src/cmd/compile/internal/ssa/rewrite.go
+++ b/src/cmd/compile/internal/ssa/rewrite.go
@@ -625,51 +625,16 @@ func truncate64Fto32F(f float64) float32 {
 	return math.Float32frombits(r)
 }
 
-// extend32Fto64F converts a float32 value to a float64 value preserving the bit
-// pattern of the mantissa.
-func extend32Fto64F(f float32) float64 {
-	if !math.IsNaN(float64(f)) {
-		return float64(f)
-	}
-	// NaN bit patterns aren't necessarily preserved across conversion
-	// instructions so we need to do the conversion manually.
-	b := uint64(math.Float32bits(f))
-	//   | sign                  | exponent      | mantissa                    |
-	r := ((b << 32) & (1 << 63)) | (0x7ff << 52) | ((b & 0x7fffff) << (52 - 23))
-	return math.Float64frombits(r)
-}
-
 // DivisionNeedsFixUp reports whether the division needs fix-up code.
 func DivisionNeedsFixUp(v *Value) bool {
 	return v.AuxInt == 0
 }
 
-// auxFrom64F encodes a float64 value so it can be stored in an AuxInt.
-func auxFrom64F(f float64) int64 {
-	if f != f {
-		panic("can't encode a NaN in AuxInt field")
-	}
-	return int64(math.Float64bits(f))
-}
-
-// auxFrom32F encodes a float32 value so it can be stored in an AuxInt.
-func auxFrom32F(f float32) int64 {
-	if f != f {
-		panic("can't encode a NaN in AuxInt field")
-	}
-	return int64(math.Float64bits(extend32Fto64F(f)))
-}
-
 // auxTo32F decodes a float32 from the AuxInt value provided.
 func auxTo32F(i int64) float32 {
 	return truncate64Fto32F(math.Float64frombits(uint64(i)))
 }
 
-// auxTo64F decodes a float64 from the AuxInt value provided.
-func auxTo64F(i int64) float64 {
-	return math.Float64frombits(uint64(i))
-}
-
 func auxIntToBool(i int64) bool {
 	if i == 0 {
 		return false
@@ -703,12 +668,6 @@ func auxIntToValAndOff(i int64) ValAndOff {
 func auxIntToArm64BitField(i int64) arm64BitField {
 	return arm64BitField(i)
 }
-func auxIntToInt128(x int64) int128 {
-	if x != 0 {
-		panic("nonzero int128 not allowed")
-	}
-	return 0
-}
 func auxIntToFlagConstant(x int64) flagConstant {
 	return flagConstant(x)
 }
@@ -750,12 +709,6 @@ func valAndOffToAuxInt(v ValAndOff) int64 {
 func arm64BitFieldToAuxInt(v arm64BitField) int64 {
 	return int64(v)
 }
-func int128ToAuxInt(x int128) int64 {
-	if x != 0 {
-		panic("nonzero int128 not allowed")
-	}
-	return 0
-}
 func flagConstantToAuxInt(x flagConstant) int64 {
 	return int64(x)
 }
@@ -826,23 +779,6 @@ func uaddOvf(a, b int64) bool {
 	return uint64(a)+uint64(b) < uint64(a)
 }
 
-// loadLSymOffset simulates reading a word at an offset into a
-// read-only symbol's runtime memory. If it would read a pointer to
-// another symbol, that symbol is returned. Otherwise, it returns nil.
-func loadLSymOffset(lsym *obj.LSym, offset int64) *obj.LSym {
-	if lsym.Type != objabi.SRODATA {
-		return nil
-	}
-
-	for _, r := range lsym.R {
-		if int64(r.Off) == offset && r.Type&^objabi.R_WEAK == objabi.R_ADDR && r.Add == 0 {
-			return r.Sym
-		}
-	}
-
-	return nil
-}
-
 func devirtLECall(v *Value, sym *obj.LSym) *Value {
 	v.Op = OpStaticLECall
 	auxcall := v.Aux.(*AuxCall)
@@ -1564,10 +1500,6 @@ func GetPPC64Shiftmb(auxint int64) int64 {
 	return int64(int8(auxint >> 8))
 }
 
-func GetPPC64Shiftme(auxint int64) int64 {
-	return int64(int8(auxint))
-}
-
 // Test if this value can encoded as a mask for a rlwinm like
 // operation.  Masks can also extend from the msb and wrap to
 // the lsb too.  That is, the valid masks are 32 bit strings
diff --git a/src/cmd/compile/internal/ssagen/ssa.go b/src/cmd/compile/internal/ssagen/ssa.go
index 72928f267b..1e2159579d 100644
--- a/src/cmd/compile/internal/ssagen/ssa.go
+++ b/src/cmd/compile/internal/ssagen/ssa.go
@@ -1322,9 +1322,6 @@ func (s *state) constInt(t *types.Type, c int64) *ssa.Value {
 	}
 	return s.constInt32(t, int32(c))
 }
-func (s *state) constOffPtrSP(t *types.Type, c int64) *ssa.Value {
-	return s.f.ConstOffPtrSP(t, c, s.sp)
-}
 
 // newValueOrSfCall* are wrappers around newValue*, which may create a call to a
 // soft-float runtime function instead (when emitting soft-float code).
@@ -5382,26 +5379,6 @@ func (s *state) putArg(n ir.Node, t *types.Type) *ssa.Value {
 	return a
 }
 
-func (s *state) storeArgWithBase(n ir.Node, t *types.Type, base *ssa.Value, off int64) {
-	pt := types.NewPtr(t)
-	var addr *ssa.Value
-	if base == s.sp {
-		// Use special routine that avoids allocation on duplicate offsets.
-		addr = s.constOffPtrSP(pt, off)
-	} else {
-		addr = s.newValue1I(ssa.OpOffPtr, pt, off, base)
-	}
-
-	if !ssa.CanSSA(t) {
-		a := s.addr(n)
-		s.move(t, addr, a)
-		return
-	}
-
-	a := s.expr(n)
-	s.storeType(t, addr, a, 0, false)
-}
-
 // slice computes the slice v[i:j:k] and returns ptr, len, and cap of result.
 // i,j,k may be nil, in which case they are set to their default value.
 // v may be a slice, string or pointer to an array.
diff --git a/src/cmd/compile/internal/syntax/printer.go b/src/cmd/compile/internal/syntax/printer.go
index 1c0bfc190e..d86d77e73f 100644
--- a/src/cmd/compile/internal/syntax/printer.go
+++ b/src/cmd/compile/internal/syntax/printer.go
@@ -138,10 +138,6 @@ func impliesSemi(tok token) bool {
 
 // TODO(gri) provide table of []byte values for all tokens to avoid repeated string conversion
 
-func lineComment(text string) bool {
-	return strings.HasPrefix(text, "//")
-}
-
 func (p *printer) addWhitespace(kind ctrlSymbol, text string) {
 	p.pending = append(p.pending, whitespace{p.lastTok, kind /*text*/})
 	switch kind {
diff --git a/src/cmd/compile/internal/typecheck/iexport.go b/src/cmd/compile/internal/typecheck/iexport.go
index 29d6b2cc2d..f3498f6009 100644
--- a/src/cmd/compile/internal/typecheck/iexport.go
+++ b/src/cmd/compile/internal/typecheck/iexport.go
@@ -235,27 +235,7 @@
 
 package typecheck
 
-import (
-	"strings"
-)
-
 const blankMarker = "$"
 
-// TparamName returns the real name of a type parameter, after stripping its
-// qualifying prefix and reverting blank-name encoding. See TparamExportName
-// for details.
-func TparamName(exportName string) string {
-	// Remove the "path" from the type param name that makes it unique.
-	ix := strings.LastIndex(exportName, ".")
-	if ix < 0 {
-		return ""
-	}
-	name := exportName[ix+1:]
-	if strings.HasPrefix(name, blankMarker) {
-		return "_"
-	}
-	return name
-}
-
 // The name used for dictionary parameters or local variables.
 const LocalDictName = ".dict"
diff --git a/src/cmd/compile/internal/typecheck/stmt.go b/src/cmd/compile/internal/typecheck/stmt.go
index ac49f251bb..2ca8e7fb86 100644
--- a/src/cmd/compile/internal/typecheck/stmt.go
+++ b/src/cmd/compile/internal/typecheck/stmt.go
@@ -19,9 +19,6 @@ func RangeExprType(t *types.Type) *types.Type {
 	return t
 }
 
-func typecheckrangeExpr(n *ir.RangeStmt) {
-}
-
 // type check assignment.
 // if this assignment is the definition of a var on the left side,
 // fill in the var's type.
diff --git a/src/cmd/compile/internal/types/type.go b/src/cmd/compile/internal/types/type.go
index d73b5e8d7b..f28490fc44 100644
--- a/src/cmd/compile/internal/types/type.go
+++ b/src/cmd/compile/internal/types/type.go
@@ -1694,13 +1694,6 @@ func fieldsHasShape(fields []*Field) bool {
 	return false
 }
 
-// newBasic returns a new basic type of the given kind.
-func newBasic(kind Kind, obj Object) *Type {
-	t := newType(kind)
-	t.obj = obj
-	return t
-}
-
 // NewInterface returns a new interface for the given methods and
 // embedded types. Embedded types are specified as fields with no Sym.
 func NewInterface(methods []*Field) *Type {
diff --git a/src/cmd/compile/internal/types2/api.go b/src/cmd/compile/internal/types2/api.go
index 49cc0e54ec..8752eff992 100644
--- a/src/cmd/compile/internal/types2/api.go
+++ b/src/cmd/compile/internal/types2/api.go
@@ -187,10 +187,6 @@ type Config struct {
 	EnableAlias bool
 }
 
-func srcimporter_setUsesCgo(conf *Config) {
-	conf.go115UsesCgo = true
-}
-
 // Info holds result type information for a type-checked package.
 // Only the information for which a map is provided is collected.
 // If the package has type errors, the collected information may
diff --git a/src/cmd/compile/internal/types2/compilersupport.go b/src/cmd/compile/internal/types2/compilersupport.go
index 20a1364288..d29241a2ed 100644
--- a/src/cmd/compile/internal/types2/compilersupport.go
+++ b/src/cmd/compile/internal/types2/compilersupport.go
@@ -13,12 +13,6 @@ func AsPointer(t Type) *Pointer {
 	return u
 }
 
-// If t is a signature, AsSignature returns that type, otherwise it returns nil.
-func AsSignature(t Type) *Signature {
-	u, _ := t.Underlying().(*Signature)
-	return u
-}
-
 // If typ is a type parameter, CoreType returns the single underlying
 // type of all types in the corresponding type constraint if it exists, or
 // nil otherwise. If the type set contains only unrestricted and restricted
diff --git a/src/cmd/dist/imports.go b/src/cmd/dist/imports.go
index 05dd84d0f1..0ec2b06c4f 100644
--- a/src/cmd/dist/imports.go
+++ b/src/cmd/dist/imports.go
@@ -205,18 +205,6 @@ func (r *importReader) readImport(imports *[]string) {
 	r.readString(imports)
 }
 
-// readComments is like ioutil.ReadAll, except that it only reads the leading
-// block of comments in the file.
-func readComments(f io.Reader) ([]byte, error) {
-	r := &importReader{b: bufio.NewReader(f)}
-	r.peekByte(true)
-	if r.err == nil && !r.eof {
-		// Didn't reach EOF, so must have found a non-space byte. Remove it.
-		r.buf = r.buf[:len(r.buf)-1]
-	}
-	return r.buf, r.err
-}
-
 // readimports returns the imports found in the named file.
 func readimports(file string) []string {
 	var imports []string
diff --git a/src/cmd/dist/util.go b/src/cmd/dist/util.go
index 4d5e3589dc..7db06f86ea 100644
--- a/src/cmd/dist/util.go
+++ b/src/cmd/dist/util.go
@@ -362,16 +362,6 @@ func errprintf(format string, args ...interface{}) {
 	fmt.Fprintf(os.Stderr, format, args...)
 }
 
-// xsamefile reports whether f1 and f2 are the same file (or dir).
-func xsamefile(f1, f2 string) bool {
-	fi1, err1 := os.Stat(f1)
-	fi2, err2 := os.Stat(f2)
-	if err1 != nil || err2 != nil {
-		return f1 == f2
-	}
-	return os.SameFile(fi1, fi2)
-}
-
 func xgetgoarm() string {
 	// If we're building on an actual arm system, and not building
 	// a cross-compiling toolchain, try to exec ourselves
diff --git a/src/cmd/go/internal/gover/toolchain.go b/src/cmd/go/internal/gover/toolchain.go
index 43b117edcf..a24df98168 100644
--- a/src/cmd/go/internal/gover/toolchain.go
+++ b/src/cmd/go/internal/gover/toolchain.go
@@ -52,16 +52,6 @@ func maybeToolchainVersion(name string) string {
 	return FromToolchain(name)
 }
 
-// ToolchainMax returns the maximum of x and y interpreted as toolchain names,
-// compared using Compare(FromToolchain(x), FromToolchain(y)).
-// If x and y compare equal, Max returns x.
-func ToolchainMax(x, y string) string {
-	if Compare(FromToolchain(x), FromToolchain(y)) < 0 {
-		return y
-	}
-	return x
-}
-
 // Startup records the information that went into the startup-time version switch.
 // It is initialized by switchGoToolchain.
 var Startup struct {
diff --git a/src/cmd/go/internal/lockedfile/internal/filelock/filelock.go b/src/cmd/go/internal/lockedfile/internal/filelock/filelock.go
index d37331892d..f0452f0147 100644
--- a/src/cmd/go/internal/lockedfile/internal/filelock/filelock.go
+++ b/src/cmd/go/internal/lockedfile/internal/filelock/filelock.go
@@ -8,7 +8,6 @@
 package filelock
 
 import (
-	"errors"
 	"io/fs"
 )
 
@@ -74,10 +73,3 @@ func (lt lockType) String() string {
 		return "Unlock"
 	}
 }
-
-// IsNotSupported returns a boolean indicating whether the error is known to
-// report that a function is not supported (possibly for a specific input).
-// It is satisfied by errors.ErrUnsupported as well as some syscall errors.
-func IsNotSupported(err error) bool {
-	return errors.Is(err, errors.ErrUnsupported)
-}
diff --git a/src/cmd/go/internal/modfetch/codehost/git.go b/src/cmd/go/internal/modfetch/codehost/git.go
index b445ac2486..8a1c12b90a 100644
--- a/src/cmd/go/internal/modfetch/codehost/git.go
+++ b/src/cmd/go/internal/modfetch/codehost/git.go
@@ -387,23 +387,6 @@ func (r *gitRepo) Latest(ctx context.Context) (*RevInfo, error) {
 	return info, nil
 }
 
-// findRef finds some ref name for the given hash,
-// for use when the server requires giving a ref instead of a hash.
-// There may be multiple ref names for a given hash,
-// in which case this returns some name - it doesn't matter which.
-func (r *gitRepo) findRef(ctx context.Context, hash string) (ref string, ok bool) {
-	refs, err := r.loadRefs(ctx)
-	if err != nil {
-		return "", false
-	}
-	for ref, h := range refs {
-		if h == hash {
-			return ref, true
-		}
-	}
-	return "", false
-}
-
 func (r *gitRepo) checkConfigSHA256(ctx context.Context) bool {
 	if hashType, sha256CfgErr := r.runGit(ctx, "git", "config", "extensions.objectformat"); sha256CfgErr == nil {
 		return "sha256" == strings.TrimSpace(string(hashType))
diff --git a/src/cmd/go/internal/modfetch/coderepo.go b/src/cmd/go/internal/modfetch/coderepo.go
index afed35c970..3df469d285 100644
--- a/src/cmd/go/internal/modfetch/coderepo.go
+++ b/src/cmd/go/internal/modfetch/coderepo.go
@@ -1009,10 +1009,6 @@ func LegacyGoMod(modPath string) []byte {
 	return fmt.Appendf(nil, "module %s\n", modfile.AutoQuote(modPath))
 }
 
-func (r *codeRepo) modPrefix(rev string) string {
-	return r.modPath + "@" + rev
-}
-
 func (r *codeRepo) retractedVersions(ctx context.Context) (func(string) bool, error) {
 	vs, err := r.Versions(ctx, "")
 	if err != nil {
diff --git a/src/cmd/go/internal/modindex/build.go b/src/cmd/go/internal/modindex/build.go
index d7e09fed25..761bda8d39 100644
--- a/src/cmd/go/internal/modindex/build.go
+++ b/src/cmd/go/internal/modindex/build.go
@@ -10,7 +10,6 @@ package modindex
 import (
 	"bytes"
 	"cmd/go/internal/fsys"
-	"cmd/go/internal/str"
 	"errors"
 	"fmt"
 	"go/ast"
@@ -118,96 +117,12 @@ func (ctxt *Context) joinPath(elem ...string) string {
 	return filepath.Join(elem...)
 }
 
-// splitPathList calls ctxt.SplitPathList (if not nil) or else filepath.SplitList.
-func (ctxt *Context) splitPathList(s string) []string {
-	if f := ctxt.SplitPathList; f != nil {
-		return f(s)
-	}
-	return filepath.SplitList(s)
-}
-
-// isAbsPath calls ctxt.IsAbsPath (if not nil) or else filepath.IsAbs.
-func (ctxt *Context) isAbsPath(path string) bool {
-	if f := ctxt.IsAbsPath; f != nil {
-		return f(path)
-	}
-	return filepath.IsAbs(path)
-}
-
 // isDir reports whether path is a directory.
 func isDir(path string) bool {
 	fi, err := fsys.Stat(path)
 	return err == nil && fi.IsDir()
 }
 
-// hasSubdir calls ctxt.HasSubdir (if not nil) or else uses
-// the local file system to answer the question.
-func (ctxt *Context) hasSubdir(root, dir string) (rel string, ok bool) {
-	if f := ctxt.HasSubdir; f != nil {
-		return f(root, dir)
-	}
-
-	// Try using paths we received.
-	if rel, ok = hasSubdir(root, dir); ok {
-		return
-	}
-
-	// Try expanding symlinks and comparing
-	// expanded against unexpanded and
-	// expanded against expanded.
-	rootSym, _ := filepath.EvalSymlinks(root)
-	dirSym, _ := filepath.EvalSymlinks(dir)
-
-	if rel, ok = hasSubdir(rootSym, dir); ok {
-		return
-	}
-	if rel, ok = hasSubdir(root, dirSym); ok {
-		return
-	}
-	return hasSubdir(rootSym, dirSym)
-}
-
-// hasSubdir reports if dir is within root by performing lexical analysis only.
-func hasSubdir(root, dir string) (rel string, ok bool) {
-	root = str.WithFilePathSeparator(filepath.Clean(root))
-	dir = filepath.Clean(dir)
-	if !strings.HasPrefix(dir, root) {
-		return "", false
-	}
-	return filepath.ToSlash(dir[len(root):]), true
-}
-
-// gopath returns the list of Go path directories.
-func (ctxt *Context) gopath() []string {
-	var all []string
-	for _, p := range ctxt.splitPathList(ctxt.GOPATH) {
-		if p == "" || p == ctxt.GOROOT {
-			// Empty paths are uninteresting.
-			// If the path is the GOROOT, ignore it.
-			// People sometimes set GOPATH=$GOROOT.
-			// Do not get confused by this common mistake.
-			continue
-		}
-		if strings.HasPrefix(p, "~") {
-			// Path segments starting with ~ on Unix are almost always
-			// users who have incorrectly quoted ~ while setting GOPATH,
-			// preventing it from expanding to $HOME.
-			// The situation is made more confusing by the fact that
-			// bash allows quoted ~ in $PATH (most shells do not).
-			// Do not get confused by this, and do not try to use the path.
-			// It does not exist, and printing errors about it confuses
-			// those users even more, because they think "sure ~ exists!".
-			// The go command diagnoses this situation and prints a
-			// useful error.
-			// On Windows, ~ is used in short names, such as c:\progra~1
-			// for c:\program files.
-			continue
-		}
-		all = append(all, p)
-	}
-	return all
-}
-
 var defaultToolTags, defaultReleaseTags []string
 
 // NoGoError is the error used by Import to describe a directory
@@ -266,114 +181,12 @@ func fileListForExt(p *build.Package, ext string) *[]string {
 	return nil
 }
 
-var errNoModules = errors.New("not using modules")
-
-func findImportComment(data []byte) (s string, line int) {
-	// expect keyword package
-	word, data := parseWord(data)
-	if string(word) != "package" {
-		return "", 0
-	}
-
-	// expect package name
-	_, data = parseWord(data)
-
-	// now ready for import comment, a // or /* */ comment
-	// beginning and ending on the current line.
-	for len(data) > 0 && (data[0] == ' ' || data[0] == '\t' || data[0] == '\r') {
-		data = data[1:]
-	}
-
-	var comment []byte
-	switch {
-	case bytes.HasPrefix(data, slashSlash):
-		comment, _, _ = bytes.Cut(data[2:], newline)
-	case bytes.HasPrefix(data, slashStar):
-		var ok bool
-		comment, _, ok = bytes.Cut(data[2:], starSlash)
-		if !ok {
-			// malformed comment
-			return "", 0
-		}
-		if bytes.Contains(comment, newline) {
-			return "", 0
-		}
-	}
-	comment = bytes.TrimSpace(comment)
-
-	// split comment into `import`, `"pkg"`
-	word, arg := parseWord(comment)
-	if string(word) != "import" {
-		return "", 0
-	}
-
-	line = 1 + bytes.Count(data[:cap(data)-cap(arg)], newline)
-	return strings.TrimSpace(string(arg)), line
-}
-
 var (
 	slashSlash = []byte("//")
 	slashStar  = []byte("/*")
 	starSlash  = []byte("*/")
-	newline    = []byte("\n")
 )
 
-// skipSpaceOrComment returns data with any leading spaces or comments removed.
-func skipSpaceOrComment(data []byte) []byte {
-	for len(data) > 0 {
-		switch data[0] {
-		case ' ', '\t', '\r', '\n':
-			data = data[1:]
-			continue
-		case '/':
-			if bytes.HasPrefix(data, slashSlash) {
-				i := bytes.Index(data, newline)
-				if i < 0 {
-					return nil
-				}
-				data = data[i+1:]
-				continue
-			}
-			if bytes.HasPrefix(data, slashStar) {
-				data = data[2:]
-				i := bytes.Index(data, starSlash)
-				if i < 0 {
-					return nil
-				}
-				data = data[i+2:]
-				continue
-			}
-		}
-		break
-	}
-	return data
-}
-
-// parseWord skips any leading spaces or comments in data
-// and then parses the beginning of data as an identifier or keyword,
-// returning that word and what remains after the word.
-func parseWord(data []byte) (word, rest []byte) {
-	data = skipSpaceOrComment(data)
-
-	// Parse past leading word characters.
-	rest = data
-	for {
-		r, size := utf8.DecodeRune(rest)
-		if unicode.IsLetter(r) || '0' <= r && r <= '9' || r == '_' {
-			rest = rest[size:]
-			continue
-		}
-		break
-	}
-
-	word = data[:len(data)-len(rest)]
-	if len(word) == 0 {
-		return nil, nil
-	}
-
-	return word, rest
-}
-
 var dummyPkg build.Package
 
 // fileInfo records information learned about a file included in a build.
diff --git a/src/cmd/go/internal/modindex/read.go b/src/cmd/go/internal/modindex/read.go
index d87fb06b57..399e89eca3 100644
--- a/src/cmd/go/internal/modindex/read.go
+++ b/src/cmd/go/internal/modindex/read.go
@@ -1039,11 +1039,6 @@ func (r *reader) string() string {
 	return r.d.stringTableAt(r.int())
 }
 
-// bool reads the next bool.
-func (r *reader) bool() bool {
-	return r.int() != 0
-}
-
 // tokpos reads the next token.Position.
 func (r *reader) tokpos() token.Position {
 	return token.Position{
diff --git a/src/cmd/go/internal/modload/buildlist.go b/src/cmd/go/internal/modload/buildlist.go
index eefc0083c9..cd3ec4f102 100644
--- a/src/cmd/go/internal/modload/buildlist.go
+++ b/src/cmd/go/internal/modload/buildlist.go
@@ -658,11 +658,6 @@ func EditBuildList(ctx context.Context, add, mustSelect []module.Version) (chang
 	return changed, nil
 }
 
-// OverrideRoots edits the global requirement roots by replacing the specific module versions.
-func OverrideRoots(ctx context.Context, replace []module.Version) {
-	requirements = overrideRoots(ctx, requirements, replace)
-}
-
 func overrideRoots(ctx context.Context, rs *Requirements, replace []module.Version) *Requirements {
 	drop := make(map[string]bool)
 	for _, m := range replace {
diff --git a/src/cmd/go/internal/modload/init.go b/src/cmd/go/internal/modload/init.go
index cb9d74df68..25151103ed 100644
--- a/src/cmd/go/internal/modload/init.go
+++ b/src/cmd/go/internal/modload/init.go
@@ -305,30 +305,6 @@ func (mms *MainModuleSet) Godebugs() []*modfile.Godebug {
 	return nil
 }
 
-// Toolchain returns the toolchain set on the single module, in module mode,
-// or the go.work file in workspace mode.
-func (mms *MainModuleSet) Toolchain() string {
-	if inWorkspaceMode() {
-		if mms.workFile != nil && mms.workFile.Toolchain != nil {
-			return mms.workFile.Toolchain.Name
-		}
-		return "go" + mms.GoVersion()
-	}
-	if mms != nil && len(mms.versions) == 1 {
-		f := mms.ModFile(mms.mustGetSingleMainModule())
-		if f == nil {
-			// Special case: we are outside a module, like 'go run x.go'.
-			// Assume the local Go version.
-			// TODO(#49228): Clean this up; see loadModFile.
-			return gover.LocalToolchain()
-		}
-		if f.Toolchain != nil {
-			return f.Toolchain.Name
-		}
-	}
-	return "go" + mms.GoVersion()
-}
-
 func (mms *MainModuleSet) WorkFileReplaceMap() map[module.Version]module.Version {
 	return mms.workFileReplaceMap
 }
diff --git a/src/cmd/go/internal/work/gc.go b/src/cmd/go/internal/work/gc.go
index 39a1f5f74c..71c36e80cb 100644
--- a/src/cmd/go/internal/work/gc.go
+++ b/src/cmd/go/internal/work/gc.go
@@ -6,7 +6,6 @@ package work
 
 import (
 	"bufio"
-	"bytes"
 	"fmt"
 	"internal/buildcfg"
 	"internal/platform"
@@ -438,32 +437,6 @@ func (gcToolchain) symabis(b *Builder, a *Action, sfiles []string) (string, erro
 	return symabis, nil
 }
 
-// toolVerify checks that the command line args writes the same output file
-// if run using newTool instead.
-// Unused now but kept around for future use.
-func toolVerify(a *Action, b *Builder, p *load.Package, newTool string, ofile string, args []any) error {
-	newArgs := make([]any, len(args))
-	copy(newArgs, args)
-	newArgs[1] = base.Tool(newTool)
-	newArgs[3] = ofile + ".new" // x.6 becomes x.6.new
-	if err := b.Shell(a).run(p.Dir, p.ImportPath, nil, newArgs...); err != nil {
-		return err
-	}
-	data1, err := os.ReadFile(ofile)
-	if err != nil {
-		return err
-	}
-	data2, err := os.ReadFile(ofile + ".new")
-	if err != nil {
-		return err
-	}
-	if !bytes.Equal(data1, data2) {
-		return fmt.Errorf("%s and %s produced different output files:\n%s\n%s", filepath.Base(args[1].(string)), newTool, strings.Join(str.StringList(args...), " "), strings.Join(str.StringList(newArgs...), " "))
-	}
-	os.Remove(ofile + ".new")
-	return nil
-}
-
 func (gcToolchain) pack(b *Builder, a *Action, afile string, ofiles []string) error {
 	absOfiles := make([]string, 0, len(ofiles))
 	for _, f := range ofiles {
diff --git a/src/cmd/internal/archive/archive.go b/src/cmd/internal/archive/archive.go
index 393034d776..b8abc0d4f6 100644
--- a/src/cmd/internal/archive/archive.go
+++ b/src/cmd/internal/archive/archive.go
@@ -498,20 +498,6 @@ func exactly16Bytes(s string) string {
 // architecture-independent object file output
 const HeaderSize = 60
 
-func ReadHeader(b *bufio.Reader, name string) int {
-	var buf [HeaderSize]byte
-	if _, err := io.ReadFull(b, buf[:]); err != nil {
-		return -1
-	}
-	aname := strings.Trim(string(buf[0:16]), " ")
-	if !strings.HasPrefix(aname, name) {
-		return -1
-	}
-	asize := strings.Trim(string(buf[48:58]), " ")
-	i, _ := strconv.Atoi(asize)
-	return i
-}
-
 func FormatHeader(arhdr []byte, name string, size int64) {
 	copy(arhdr[:], fmt.Sprintf("%-16s%-12d%-6d%-6d%-8o%-10d`\n", name, 0, 0, 0, 0644, size))
 }
diff --git a/src/cmd/internal/gcprog/gcprog.go b/src/cmd/internal/gcprog/gcprog.go
index eeea53daf4..52505f3b20 100644
--- a/src/cmd/internal/gcprog/gcprog.go
+++ b/src/cmd/internal/gcprog/gcprog.go
@@ -56,11 +56,6 @@ func (w *Writer) Debug(out io.Writer) {
 	w.debug = out
 }
 
-// BitIndex returns the number of bits written to the bit stream so far.
-func (w *Writer) BitIndex() int64 {
-	return w.index
-}
-
 // byte writes the byte x to the output.
 func (w *Writer) byte(x byte) {
 	if w.debug != nil {
@@ -98,20 +93,6 @@ func (w *Writer) Ptr(index int64) {
 	w.lit(1)
 }
 
-// ShouldRepeat reports whether it would be worthwhile to
-// use a Repeat to describe c elements of n bits each,
-// compared to just emitting c copies of the n-bit description.
-func (w *Writer) ShouldRepeat(n, c int64) bool {
-	// Should we lay out the bits directly instead of
-	// encoding them as a repetition? Certainly if count==1,
-	// since there's nothing to repeat, but also if the total
-	// size of the plain pointer bits for the type will fit in
-	// 4 or fewer bytes, since using a repetition will require
-	// flushing the current bits plus at least one byte for
-	// the repeat size and one for the repeat count.
-	return c > 1 && c*n > 4*8
-}
-
 // Repeat emits an instruction to repeat the description
 // of the last n words c times (including the initial description, c+1 times in total).
 func (w *Writer) Repeat(n, c int64) {
@@ -163,36 +144,6 @@ func (w *Writer) ZeroUntil(index int64) {
 	w.Repeat(1, skip-1)
 }
 
-// Append emits the given GC program into the current output.
-// The caller asserts that the program emits n bits (describes n words),
-// and Append panics if that is not true.
-func (w *Writer) Append(prog []byte, n int64) {
-	w.flushlit()
-	if w.debug != nil {
-		fmt.Fprintf(w.debug, "gcprog: append prog for %d ptrs\n", n)
-		fmt.Fprintf(w.debug, "\t")
-	}
-	n1 := progbits(prog)
-	if n1 != n {
-		panic("gcprog: wrong bit count in append")
-	}
-	// The last byte of the prog terminates the program.
-	// Don't emit that, or else our own program will end.
-	for i, x := range prog[:len(prog)-1] {
-		if w.debug != nil {
-			if i > 0 {
-				fmt.Fprintf(w.debug, " ")
-			}
-			fmt.Fprintf(w.debug, "%02x", x)
-		}
-		w.byte(x)
-	}
-	if w.debug != nil {
-		fmt.Fprintf(w.debug, "\n")
-	}
-	w.index += n
-}
-
 // progbits returns the length of the bit stream encoded by the program p.
 func progbits(p []byte) int64 {
 	var n int64
diff --git a/src/cmd/internal/goobj/objfile.go b/src/cmd/internal/goobj/objfile.go
index a9342427ef..38da67076d 100644
--- a/src/cmd/internal/goobj/objfile.go
+++ b/src/cmd/internal/goobj/objfile.go
@@ -635,29 +635,11 @@ func (r *Reader) uint64At(off uint32) uint64 {
 	return binary.LittleEndian.Uint64(b)
 }
 
-func (r *Reader) int64At(off uint32) int64 {
-	return int64(r.uint64At(off))
-}
-
 func (r *Reader) uint32At(off uint32) uint32 {
 	b := r.BytesAt(off, 4)
 	return binary.LittleEndian.Uint32(b)
 }
 
-func (r *Reader) int32At(off uint32) int32 {
-	return int32(r.uint32At(off))
-}
-
-func (r *Reader) uint16At(off uint32) uint16 {
-	b := r.BytesAt(off, 2)
-	return binary.LittleEndian.Uint16(b)
-}
-
-func (r *Reader) uint8At(off uint32) uint8 {
-	b := r.BytesAt(off, 1)
-	return b[0]
-}
-
 func (r *Reader) StringAt(off uint32, len uint32) string {
 	b := r.b[off : off+len]
 	if r.readonly {
diff --git a/src/cmd/internal/obj/arm64/asm7.go b/src/cmd/internal/obj/arm64/asm7.go
index 344b73e658..0c9c70aa89 100644
--- a/src/cmd/internal/obj/arm64/asm7.go
+++ b/src/cmd/internal/obj/arm64/asm7.go
@@ -1054,15 +1054,6 @@ var sysInstFields = map[SpecialOperand]struct {
 // Used for padding NOOP instruction
 const OP_NOOP = 0xd503201f
 
-// pcAlignPadLength returns the number of bytes required to align pc to alignedValue,
-// reporting an error if alignedValue is not a power of two or is out of range.
-func pcAlignPadLength(ctxt *obj.Link, pc int64, alignedValue int64) int {
-	if !((alignedValue&(alignedValue-1) == 0) && 8 <= alignedValue && alignedValue <= 2048) {
-		ctxt.Diag("alignment value of an instruction must be a power of two and in the range [8, 2048], got %d\n", alignedValue)
-	}
-	return int(-pc & (alignedValue - 1))
-}
-
 // size returns the size of the sequence of machine instructions when p is encoded with o.
 // Usually it just returns o.size directly, in some cases it checks whether the optimization
 // conditions are met, and if so returns the size of the optimized instruction sequence.
@@ -1209,10 +1200,6 @@ type codeBuffer struct {
 	data *[]byte
 }
 
-func (cb *codeBuffer) pc() int64 {
-	return int64(len(*cb.data))
-}
-
 // Write a sequence of opcodes into the code buffer.
 func (cb *codeBuffer) emit(op ...uint32) {
 	for _, o := range op {
diff --git a/src/cmd/internal/obj/loong64/asm.go b/src/cmd/internal/obj/loong64/asm.go
index 2ed12698e6..0d1b202e80 100644
--- a/src/cmd/internal/obj/loong64/asm.go
+++ b/src/cmd/internal/obj/loong64/asm.go
@@ -729,10 +729,6 @@ func isint32(v int64) bool {
 	return int64(int32(v)) == v
 }
 
-func isuint32(v uint64) bool {
-	return uint64(uint32(v)) == v
-}
-
 func (c *ctxt0) aclass(a *obj.Addr) int {
 	switch a.Type {
 	case obj.TYPE_NONE:
diff --git a/src/cmd/internal/obj/loong64/obj.go b/src/cmd/internal/obj/loong64/obj.go
index 79fbb23fef..a1eb786da3 100644
--- a/src/cmd/internal/obj/loong64/obj.go
+++ b/src/cmd/internal/obj/loong64/obj.go
@@ -771,14 +771,6 @@ func (c *ctxt0) stacksplit(p *obj.Prog, framesize int32) *obj.Prog {
 	return end
 }
 
-func (c *ctxt0) addnop(p *obj.Prog) {
-	q := c.newprog()
-	q.As = ANOOP
-	q.Pos = p.Pos
-	q.Link = p.Link
-	p.Link = q
-}
-
 var Linkloong64 = obj.LinkArch{
 	Arch:           sys.ArchLoong64,
 	Init:           buildop,
diff --git a/src/cmd/internal/obj/ppc64/asm9.go b/src/cmd/internal/obj/ppc64/asm9.go
index 9cba8c33ce..dcd3aa59a4 100644
--- a/src/cmd/internal/obj/ppc64/asm9.go
+++ b/src/cmd/internal/obj/ppc64/asm9.go
@@ -2137,10 +2137,6 @@ func OPVCC(o uint32, xo uint32, oe uint32, rc uint32) uint32 {
 	return o<<26 | xo<<1 | oe<<10 | rc&1
 }
 
-func OPCC(o uint32, xo uint32, rc uint32) uint32 {
-	return OPVCC(o, xo, 0, rc)
-}
-
 /* Generate MD-form opcode */
 func OPMD(o, xo, rc uint32) uint32 {
 	return o<<26 | xo<<2 | rc&1
diff --git a/src/cmd/internal/obj/riscv/obj.go b/src/cmd/internal/obj/riscv/obj.go
index 078e81a2f7..44edb8d841 100644
--- a/src/cmd/internal/obj/riscv/obj.go
+++ b/src/cmd/internal/obj/riscv/obj.go
@@ -1072,24 +1072,6 @@ func regV(r uint32) uint32 {
 	return regVal(r, REG_V0, REG_V31)
 }
 
-// regAddr extracts a register from an Addr.
-func regAddr(a obj.Addr, min, max uint32) uint32 {
-	if a.Type != obj.TYPE_REG {
-		panic(fmt.Sprintf("ill typed: %+v", a))
-	}
-	return regVal(uint32(a.Reg), min, max)
-}
-
-// regIAddr extracts the integer register from an Addr.
-func regIAddr(a obj.Addr) uint32 {
-	return regAddr(a, REG_X0, REG_X31)
-}
-
-// regFAddr extracts the float register from an Addr.
-func regFAddr(a obj.Addr) uint32 {
-	return regAddr(a, REG_F0, REG_F31)
-}
-
 // immEven checks that the immediate is a multiple of two. If it
 // is not, an error is returned.
 func immEven(x int64) error {
diff --git a/src/cmd/internal/obj/s390x/asmz.go b/src/cmd/internal/obj/s390x/asmz.go
index 957222a155..97de5a4a08 100644
--- a/src/cmd/internal/obj/s390x/asmz.go
+++ b/src/cmd/internal/obj/s390x/asmz.go
@@ -2677,20 +2677,6 @@ func (c *ctxtz) addrilreloc(sym *obj.LSym, add int64) {
 	})
 }
 
-func (c *ctxtz) addrilrelocoffset(sym *obj.LSym, add, offset int64) {
-	if sym == nil {
-		c.ctxt.Diag("require symbol to apply relocation")
-	}
-	offset += int64(2) // relocation offset from start of instruction
-	c.cursym.AddRel(c.ctxt, obj.Reloc{
-		Type: objabi.R_PCRELDBL,
-		Off:  int32(c.pc + offset),
-		Siz:  4,
-		Sym:  sym,
-		Add:  add + offset + 4,
-	})
-}
-
 // Add a CALL relocation for the immediate in a RIL style instruction.
 // The addend will be adjusted as required.
 func (c *ctxtz) addcallreloc(sym *obj.LSym, add int64) {
@@ -4745,16 +4731,6 @@ func zI(op, i1 uint32, asm *[]byte) {
 	*asm = append(*asm, uint8(op>>8), uint8(i1))
 }
 
-func zMII(op, m1, ri2, ri3 uint32, asm *[]byte) {
-	*asm = append(*asm,
-		uint8(op>>8),
-		(uint8(m1)<<4)|uint8((ri2>>8)&0x0F),
-		uint8(ri2),
-		uint8(ri3>>16),
-		uint8(ri3>>8),
-		uint8(ri3))
-}
-
 func zRI(op, r1_m1, i2_ri2 uint32, asm *[]byte) {
 	*asm = append(*asm,
 		uint8(op>>8),
@@ -4807,16 +4783,6 @@ func zRIL(f form, op, r1_m1, i2_ri2 uint32, asm *[]byte) {
 		uint8(i2_ri2))
 }
 
-func zRIS(op, r1, m3, b4, d4, i2 uint32, asm *[]byte) {
-	*asm = append(*asm,
-		uint8(op>>8),
-		(uint8(r1)<<4)|uint8(m3&0x0F),
-		(uint8(b4)<<4)|(uint8(d4>>8)&0x0F),
-		uint8(d4),
-		uint8(i2),
-		uint8(op))
-}
-
 func zRR(op, r1, r2 uint32, asm *[]byte) {
 	*asm = append(*asm, uint8(op>>8), (uint8(r1)<<4)|uint8(r2&0x0F))
 }
@@ -4845,16 +4811,6 @@ func zRRF(op, r3_m3, m4, r1, r2 uint32, asm *[]byte) {
 		(uint8(r1)<<4)|uint8(r2&0x0F))
 }
 
-func zRRS(op, r1, r2, b4, d4, m3 uint32, asm *[]byte) {
-	*asm = append(*asm,
-		uint8(op>>8),
-		(uint8(r1)<<4)|uint8(r2&0x0F),
-		(uint8(b4)<<4)|uint8((d4>>8)&0x0F),
-		uint8(d4),
-		uint8(m3)<<4,
-		uint8(op))
-}
-
 func zRS(op, r1, r3_m3, b2, d2 uint32, asm *[]byte) {
 	*asm = append(*asm,
 		uint8(op>>8),
@@ -4863,23 +4819,6 @@ func zRS(op, r1, r3_m3, b2, d2 uint32, asm *[]byte) {
 		uint8(d2))
 }
 
-func zRSI(op, r1, r3, ri2 uint32, asm *[]byte) {
-	*asm = append(*asm,
-		uint8(op>>8),
-		(uint8(r1)<<4)|uint8(r3&0x0F),
-		uint8(ri2>>8),
-		uint8(ri2))
-}
-
-func zRSL(op, l1, b2, d2 uint32, asm *[]byte) {
-	*asm = append(*asm,
-		uint8(op>>8),
-		uint8(l1),
-		(uint8(b2)<<4)|uint8((d2>>8)&0x0F),
-		uint8(d2),
-		uint8(op))
-}
-
 func zRSY(op, r1, r3_m3, b2, d2 uint32, asm *[]byte) {
 	dl2 := uint16(d2) & 0x0FFF
 	*asm = append(*asm,
@@ -4909,16 +4848,6 @@ func zRXE(op, r1, x2, b2, d2, m3 uint32, asm *[]byte) {
 		uint8(op))
 }
 
-func zRXF(op, r3, x2, b2, d2, m1 uint32, asm *[]byte) {
-	*asm = append(*asm,
-		uint8(op>>8),
-		(uint8(r3)<<4)|uint8(x2&0x0F),
-		(uint8(b2)<<4)|uint8((d2>>8)&0x0F),
-		uint8(d2),
-		uint8(m1)<<4,
-		uint8(op))
-}
-
 func zRXY(op, r1_m1, x2, b2, d2 uint32, asm *[]byte) {
 	dl2 := uint16(d2) & 0x0FFF
 	*asm = append(*asm,
@@ -4967,16 +4896,6 @@ func zSIY(op, i2, b1, d1 uint32, asm *[]byte) {
 		uint8(op))
 }
 
-func zSMI(op, m1, b3, d3, ri2 uint32, asm *[]byte) {
-	*asm = append(*asm,
-		uint8(op>>8),
-		uint8(m1)<<4,
-		(uint8(b3)<<4)|uint8((d3>>8)&0x0F),
-		uint8(d3),
-		uint8(ri2>>8),
-		uint8(ri2))
-}
-
 // Expected argument values for the instruction formats.
 //
 // Format    a1  a2  a3  a4  a5  a6
@@ -5006,26 +4925,6 @@ func zSS(f form, op, l1_r1, l2_i3_r3, b1_b2, d1_d2, b2_b4, d2_d4 uint32, asm *[]
 		uint8(d2_d4))
 }
 
-func zSSE(op, b1, d1, b2, d2 uint32, asm *[]byte) {
-	*asm = append(*asm,
-		uint8(op>>8),
-		uint8(op),
-		(uint8(b1)<<4)|uint8((d1>>8)&0x0F),
-		uint8(d1),
-		(uint8(b2)<<4)|uint8((d2>>8)&0x0F),
-		uint8(d2))
-}
-
-func zSSF(op, r3, b1, d1, b2, d2 uint32, asm *[]byte) {
-	*asm = append(*asm,
-		uint8(op>>8),
-		(uint8(r3)<<4)|(uint8(op)&0x0F),
-		(uint8(b1)<<4)|uint8((d1>>8)&0x0F),
-		uint8(d1),
-		(uint8(b2)<<4)|uint8((d2>>8)&0x0F),
-		uint8(d2))
-}
-
 func rxb(va, vb, vc, vd uint32) uint8 {
 	mask := uint8(0)
 	if va >= REG_V16 && va <= REG_V31 {
diff --git a/src/cmd/internal/obj/x86/asm6.go b/src/cmd/internal/obj/x86/asm6.go
index 3332134141..0906f16eaa 100644
--- a/src/cmd/internal/obj/x86/asm6.go
+++ b/src/cmd/internal/obj/x86/asm6.go
@@ -2037,23 +2037,6 @@ type nopPad struct {
 	n int32     // Size of the pad
 }
 
-// requireAlignment ensures that the function alignment is at
-// least as high as a, which should be a power of two
-// and between 8 and 2048, inclusive.
-//
-// the boolean result indicates whether the alignment meets those constraints
-func requireAlignment(a int64, ctxt *obj.Link, cursym *obj.LSym) bool {
-	if !((a&(a-1) == 0) && 8 <= a && a <= 2048) {
-		ctxt.Diag("alignment value of an instruction must be a power of two and in the range [8, 2048], got %d\n", a)
-		return false
-	}
-	// By default function alignment is 32 bytes for amd64
-	if cursym.Func().Align < int32(a) {
-		cursym.Func().Align = int32(a)
-	}
-	return true
-}
-
 func span6(ctxt *obj.Link, s *obj.LSym, newprog obj.ProgAlloc) {
 	if ctxt.Retpoline && ctxt.Arch.Family == sys.I386 {
 		ctxt.Diag("-spectre=ret not supported on 386")
diff --git a/src/cmd/internal/obj/x86/obj6.go b/src/cmd/internal/obj/x86/obj6.go
index 7f308686c1..48287546b3 100644
--- a/src/cmd/internal/obj/x86/obj6.go
+++ b/src/cmd/internal/obj/x86/obj6.go
@@ -852,11 +852,6 @@ func isZeroArgRuntimeCall(s *obj.LSym) bool {
 	return false
 }
 
-func indir_cx(ctxt *obj.Link, a *obj.Addr) {
-	a.Type = obj.TYPE_MEM
-	a.Reg = REG_CX
-}
-
 // loadG ensures the G is loaded into a register (either CX or REGG),
 // appending instructions to p if necessary. It returns the new last
 // instruction and the G register.
diff --git a/src/cmd/internal/robustio/robustio.go b/src/cmd/internal/robustio/robustio.go
index 15b33773cf..73f88dcdd0 100644
--- a/src/cmd/internal/robustio/robustio.go
+++ b/src/cmd/internal/robustio/robustio.go
@@ -37,17 +37,3 @@ func ReadFile(filename string) ([]byte, error) {
 func RemoveAll(path string) error {
 	return removeAll(path)
 }
-
-// IsEphemeralError reports whether err is one of the errors that the functions
-// in this package attempt to mitigate.
-//
-// Errors considered ephemeral include:
-//   - syscall.ERROR_ACCESS_DENIED
-//   - syscall.ERROR_FILE_NOT_FOUND
-//   - internal/syscall/windows.ERROR_SHARING_VIOLATION
-//
-// This set may be expanded in the future; programs must not rely on the
-// non-ephemerality of any given error.
-func IsEphemeralError(err error) bool {
-	return isEphemeralError(err)
-}
diff --git a/src/cmd/internal/script/engine.go b/src/cmd/internal/script/engine.go
index ba821712e5..eb9344f6e2 100644
--- a/src/cmd/internal/script/engine.go
+++ b/src/cmd/internal/script/engine.go
@@ -72,14 +72,6 @@ type Engine struct {
 	Quiet bool
 }
 
-// NewEngine returns an Engine configured with a basic set of commands and conditions.
-func NewEngine() *Engine {
-	return &Engine{
-		Cmds:  DefaultCmds(),
-		Conds: DefaultConds(),
-	}
-}
-
 // A Cmd is a command that is available to a script.
 type Cmd interface {
 	// Run begins running the command.
diff --git a/src/cmd/link/internal/amd64/asm.go b/src/cmd/link/internal/amd64/asm.go
index 7754cf9bfa..b8127a2538 100644
--- a/src/cmd/link/internal/amd64/asm.go
+++ b/src/cmd/link/internal/amd64/asm.go
@@ -40,10 +40,6 @@ import (
 	"log"
 )
 
-func PADDR(x uint32) uint32 {
-	return x &^ 0x80000000
-}
-
 func gentext(ctxt *ld.Link, ldr *loader.Loader) {
 	initfunc, addmoduledata := ld.PrepareAddmoduledata(ctxt)
 	if initfunc == nil {
diff --git a/src/cmd/link/internal/ld/decodesym.go b/src/cmd/link/internal/ld/decodesym.go
index 8c9fa8efab..949ea55905 100644
--- a/src/cmd/link/internal/ld/decodesym.go
+++ b/src/cmd/link/internal/ld/decodesym.go
@@ -244,35 +244,6 @@ func decodetypeGcmask(ctxt *Link, s loader.Sym) []byte {
 	return ctxt.loader.Data(mask)
 }
 
-// Type.commonType.gc
-func decodetypeGcprog(ctxt *Link, s loader.Sym) []byte {
-	if ctxt.loader.SymType(s) == sym.SDYNIMPORT {
-		symData := ctxt.loader.Data(s)
-		addr := decodetypeGcprogShlib(ctxt, symData)
-		sect := findShlibSection(ctxt, ctxt.loader.SymPkg(s), addr)
-		if sect != nil {
-			// A gcprog is a 4-byte uint32 indicating length, followed by
-			// the actual program.
-			progsize := make([]byte, 4)
-			_, err := sect.ReadAt(progsize, int64(addr-sect.Addr))
-			if err != nil {
-				log.Fatal(err)
-			}
-			progbytes := make([]byte, ctxt.Arch.ByteOrder.Uint32(progsize))
-			_, err = sect.ReadAt(progbytes, int64(addr-sect.Addr+4))
-			if err != nil {
-				log.Fatal(err)
-			}
-			return append(progsize, progbytes...)
-		}
-		Exitf("cannot find gcprog for %s", ctxt.loader.SymName(s))
-		return nil
-	}
-	relocs := ctxt.loader.Relocs(s)
-	rs := decodeRelocSym(ctxt.loader, s, &relocs, 2*int32(ctxt.Arch.PtrSize)+8+1*int32(ctxt.Arch.PtrSize))
-	return ctxt.loader.Data(rs)
-}
-
 // Find the elf.Section of a given shared library that contains a given address.
 func findShlibSection(ctxt *Link, path string, addr uint64) *elf.Section {
 	for _, shlib := range ctxt.Shlibs {
diff --git a/src/cmd/trace/viewer.go b/src/cmd/trace/viewer.go
index da83e81ab9..f8abcec2cb 100644
--- a/src/cmd/trace/viewer.go
+++ b/src/cmd/trace/viewer.go
@@ -9,7 +9,6 @@ import (
 	"internal/trace"
 	"internal/trace/traceviewer"
 	"slices"
-	"time"
 )
 
 // viewerFrames returns the frames of the stack of ev. The given frame slice is
@@ -40,7 +39,3 @@ func viewerGState(state trace.GoState, inMarkAssist bool) traceviewer.GState {
 		panic(fmt.Sprintf("unknown GoState: %s", state.String()))
 	}
 }
-
-func viewerTime(t time.Duration) float64 {
-	return float64(t) / float64(time.Microsecond)
-}
-- 
2.51.0