cmd/internal/obj/ppc64: remove unused REG_DCR types

The assembler does not support parsing DCRx registers,
nor does the compiler generate opcodes with these.

Likewise, these registers are only available on ISA
2.07 embedded processors which are not supported in
golang.

Change-Id: Iea258e5958a2022bda0eee8348de1b06437148df
Reviewed-on: https://go-review.googlesource.com/c/go/+/352790
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
TryBot-Result: Go Bot <gobot@golang.org>
Trust: Lynn Boger <laboger@linux.vnet.ibm.com>

diff --git a/src/cmd/internal/obj/ppc64/a.out.go b/src/cmd/internal/obj/ppc64/a.out.go
index b5696f79933419d4f9ac1ce0a2bf8e8e62253099..3a1e2d3c9ac0350119d699df6cf1d5c84376e87a 100644 (file)
--- a/src/cmd/internal/obj/ppc64/a.out.go
+++ b/src/cmd/internal/obj/ppc64/a.out.go
@@ -231,7 +231,6 @@ const (
        REG_SPECIAL = REG_CR0
 
        REG_SPR0 = obj.RBasePPC64 + 1024 // first of 1024 registers
-       REG_DCR0 = obj.RBasePPC64 + 2048 // first of 1024 registers
 
        REG_XER = REG_SPR0 + 1
        REG_LR  = REG_SPR0 + 8

diff --git a/src/cmd/internal/obj/ppc64/asm9.go b/src/cmd/internal/obj/ppc64/asm9.go
index 1d92c4866f15d99c940e8c5025b4138db3ef2bbb..ff94fa72c75830a28c54e2afb48bb3d629e6c1df 100644 (file)
--- a/src/cmd/internal/obj/ppc64/asm9.go
+++ b/src/cmd/internal/obj/ppc64/asm9.go
@@ -828,10 +828,6 @@ func (c *ctxt9) aclass(a *obj.Addr) int {
 
                        return C_SPR
                }
-
-               if REG_DCR0 <= a.Reg && a.Reg <= REG_DCR0+1023 {
-                       return C_SPR
-               }
                if a.Reg == REG_FPSCR {
                        return C_FPSCR
                }
@@ -3341,25 +3337,17 @@ func (c *ctxt9) asmout(p *obj.Prog, o *Optab, out []uint32) {
                }
                o1 = OP_MTFSFI | (uint32(p.To.Reg)&15)<<23 | (uint32(c.regoff(&p.From))&31)<<12
 
-       case 66: /* mov spr,r1; mov r1,spr, also dcr */
+       case 66: /* mov spr,r1; mov r1,spr */
                var r int
                var v int32
                if REG_R0 <= p.From.Reg && p.From.Reg <= REG_R31 {
                        r = int(p.From.Reg)
                        v = int32(p.To.Reg)
-                       if REG_DCR0 <= v && v <= REG_DCR0+1023 {
-                               o1 = OPVCC(31, 451, 0, 0) /* mtdcr */
-                       } else {
-                               o1 = OPVCC(31, 467, 0, 0) /* mtspr */
-                       }
+                       o1 = OPVCC(31, 467, 0, 0) /* mtspr */
                } else {
                        r = int(p.To.Reg)
                        v = int32(p.From.Reg)
-                       if REG_DCR0 <= v && v <= REG_DCR0+1023 {
-                               o1 = OPVCC(31, 323, 0, 0) /* mfdcr */
-                       } else {
-                               o1 = OPVCC(31, 339, 0, 0) /* mfspr */
-                       }
+                       o1 = OPVCC(31, 339, 0, 0) /* mfspr */
                }
 
                o1 = AOP_RRR(o1, uint32(r), 0, 0) | (uint32(v)&0x1f)<<16 | ((uint32(v)>>5)&0x1f)<<11

diff --git a/src/cmd/internal/obj/ppc64/list9.go b/src/cmd/internal/obj/ppc64/list9.go
index 461950dc6054e474bebcb2ac6c3a71604c0970d1..8b0b36f3757db22f233ee6577a3c3e2da8c56914 100644 (file)
--- a/src/cmd/internal/obj/ppc64/list9.go
+++ b/src/cmd/internal/obj/ppc64/list9.go
@@ -35,7 +35,7 @@ import (
 )
 
 func init() {
-       obj.RegisterRegister(obj.RBasePPC64, REG_DCR0+1024, rconv)
+       obj.RegisterRegister(obj.RBasePPC64, REG_SPR0+1024, rconv)
        obj.RegisterOpcode(obj.ABasePPC64, Anames)
 }
 
@@ -80,9 +80,6 @@ func rconv(r int) string {
                return fmt.Sprintf("SPR(%d)", r-REG_SPR0)
        }
 
-       if REG_DCR0 <= r && r <= REG_DCR0+1023 {
-               return fmt.Sprintf("DCR(%d)", r-REG_DCR0)
-       }
        if r == REG_FPSCR {
                return "FPSCR"
        }