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cmd/compile: reserve less memory for bitvectors

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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>
This commit is contained in:
Keith Randall 2026-01-14 09:33:10 -08:00 • committed by Gopher Robot
parent 0152075d5a
commit bfb851c31e
1 changed files with 1 additions and 1 deletions
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src/cmd/compile/internal/liveness/plive.go
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@ -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)