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cmd/compile: add clobberdeadreg mode

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When -clobberdeadreg flag is set, the compiler inserts code that
clobbers integer registers at call sites. This may be helpful for
debugging register ABI.

Only implemented on AMD64 for now.

Change-Id: Ia203d3f891c30fd95d0103489056fe01d63a2899
Reviewed-on: https://go-review.googlesource.com/c/go/+/302809
Trust: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
This commit is contained in:
Cherry Zhang 2021-03-17 19:15:38 -04:00
parent 9f2a71b6e7
commit 6ae3b70ef2
17 changed files with 103 additions and 8 deletions
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3
src/cmd/compile/internal/wasm/ssa.go
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@ -190,6 +190,9 @@ func ssaGenValue(s *ssagen.State, v *ssa.Value) {
p := s.Prog(storeOp(v.Type))
ssagen.AddrAuto(&p.To, v)
case ssa.OpClobber, ssa.OpClobberReg:
// TODO: implement for clobberdead experiment. Nop is ok for now.
default:
if v.Type.IsMemory() {
return