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[dev.typeparams] cmd/compile, runtime: do not zero X15 on Plan 9

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On Plan 9, we cannot use SSE registers in note handlers, so we
don't use X15 for zeroing (MOVOstorezero and DUFFZERO). Do not
zero X15 on Plan 9.

Change-Id: I2b083b01b27965611cb83d19afd66b383dc77846
Reviewed-on: https://go-review.googlesource.com/c/go/+/321329
Trust: Cherry Mui <cherryyz@google.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Than McIntosh <thanm@google.com>
This commit is contained in:
Cherry Mui 2021-05-19 18:13:45 -04:00
parent a5cd89b8c3
commit 02117775d1
2 changed files with 11 additions and 3 deletions
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12
src/cmd/compile/internal/amd64/ssa.go
View file

@ -1005,14 +1005,18 @@ func ssaGenValue(s *ssagen.State, v *ssa.Value) {
case ssa.OpAMD64CALLstatic:
if buildcfg.Experiment.RegabiG && s.ABI == obj.ABI0 && v.Aux.(*ssa.AuxCall).Fn.ABI() == obj.ABIInternal {
// zeroing X15 when entering ABIInternal from ABI0
opregreg(s, x86.AXORPS, x86.REG_X15, x86.REG_X15)
if buildcfg.GOOS != "plan9" { // do not use SSE on Plan 9
opregreg(s, x86.AXORPS, x86.REG_X15, x86.REG_X15)
}
// set G register from TLS
getgFromTLS(s, x86.REG_R14)
}
s.Call(v)
if buildcfg.Experiment.RegabiG && s.ABI == obj.ABIInternal && v.Aux.(*ssa.AuxCall).Fn.ABI() == obj.ABI0 {
// zeroing X15 when entering ABIInternal from ABI0
opregreg(s, x86.AXORPS, x86.REG_X15, x86.REG_X15)
if buildcfg.GOOS != "plan9" { // do not use SSE on Plan 9
opregreg(s, x86.AXORPS, x86.REG_X15, x86.REG_X15)
}
// set G register from TLS
getgFromTLS(s, x86.REG_R14)
}
@ -1306,7 +1310,9 @@ func ssaGenBlock(s *ssagen.State, b, next *ssa.Block) {
case ssa.BlockRetJmp:
if buildcfg.Experiment.RegabiG && s.ABI == obj.ABI0 && b.Aux.(*obj.LSym).ABI() == obj.ABIInternal {
// zeroing X15 when entering ABIInternal from ABI0
opregreg(s, x86.AXORPS, x86.REG_X15, x86.REG_X15)
if buildcfg.GOOS != "plan9" { // do not use SSE on Plan 9
opregreg(s, x86.AXORPS, x86.REG_X15, x86.REG_X15)
}
// set G register from TLS
getgFromTLS(s, x86.REG_R14)
}

2
src/runtime/asm_amd64.s
View file

@ -1600,7 +1600,9 @@ TEXT ·sigpanic0<ABIInternal>(SB),NOSPLIT,$0-0
#ifdef GOEXPERIMENT_regabig
get_tls(R14)
MOVQ g(R14), R14
#ifndef GOOS_plan9
XORPS X15, X15
#endif
#endif
JMP ·sigpanic<ABIInternal>(SB)