From: Keith Randall <khr@golang.org>
Date: Wed, 14 Jan 2026 17:33:10 +0000 (-0800)
Subject: cmd/compile: reserve less memory for bitvectors
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=bfb851c31eaf385649263e42e1a8620e2df01158;p=gostls13.git

cmd/compile: reserve less memory for bitvectors

We only need 4 per block, not 7. That's almost 50% savings.

Update #77170

Change-Id: I6229a1137e7a03769e30bd4081078817de9a4f84
Reviewed-on: https://go-review.googlesource.com/c/go/+/736340
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Auto-Submit: Keith Randall <khr@golang.org>
---

diff --git a/src/cmd/compile/internal/liveness/plive.go b/src/cmd/compile/internal/liveness/plive.go
index 63c85ea26d..4659d10460 100644
--- a/src/cmd/compile/internal/liveness/plive.go
+++ b/src/cmd/compile/internal/liveness/plive.go
@@ -427,7 +427,7 @@ func newliveness(fn *ir.Func, f *ssa.Func, vars []*ir.Name, idx map[*ir.Name]int
 
 	nblocks := int32(len(f.Blocks))
 	nvars := int32(len(vars))
-	bulk := bitvec.NewBulk(nvars, nblocks*7, fn.Pos())
+	bulk := bitvec.NewBulk(nvars, nblocks*4, fn.Pos())
 	for _, b := range f.Blocks {
 		be := lv.blockEffects(b)