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cmd/compile: ensure we don't reuse temporary register

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Before this CL, we could use the same register for both a temporary
register and for moving a value in the output register out of the way.

Fixes #71857

Change-Id: Iefbfd9d4139136174570d8aadf8a0fb391791ea9
Reviewed-on: https://go-review.googlesource.com/c/go/+/651221
Reviewed-by: David Chase <drchase@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Keith Randall <khr@google.com>
This commit is contained in:
khr@golang.org 2025-02-23 10:34:00 -08:00 • committed by Keith Randall
parent 1e92ff11f5
commit cc16fb52e6
2 changed files with 30 additions and 0 deletions
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1
src/cmd/compile/internal/ssa/regalloc.go
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@ -1677,6 +1677,7 @@ func (s *regAllocState) regalloc(f *Func) {
}
tmpReg = s.allocReg(m, &tmpVal)
s.nospill |= regMask(1) << tmpReg
s.tmpused |= regMask(1) << tmpReg
}
// Now that all args are in regs, we're ready to issue the value itself.