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cmd/compile: fix optimization of Zero newobject on amd64p32

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On amd64p32, PtrSize and RegSize don't agree, and function return
value is aligned with RegSize. Fix this rule. Other architectures
are not affected, where PtrSize and RegSize are the same.

Change-Id: If187d3dfde3dc3b931b8e97db5eeff49a781551b
Reviewed-on: https://go-review.googlesource.com/37720
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
This commit is contained in:
Cherry Zhang 2017-03-03 13:53:13 -05:00
parent d8a0f74801
commit 9b480521d8
2 changed files with 4 additions and 4 deletions
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2
src/cmd/compile/internal/ssa/gen/generic.rules
View File

@ -1388,7 +1388,7 @@
(Zero (Load (OffPtr [c] (SP)) mem) mem)
&& mem.Op == OpStaticCall
&& isSameSym(mem.Aux, "runtime.newobject")
&& c == config.ctxt.FixedFrameSize() + config.PtrSize // offset of return value
&& c == config.ctxt.FixedFrameSize() + config.RegSize // offset of return value
-> mem
// nil checks just need to rewrite to something useless.
// they will be deadcode eliminated soon afterwards.

4
src/cmd/compile/internal/ssa/rewritegeneric.go
View File

@ -17210,7 +17210,7 @@ func rewriteValuegeneric_OpZero(v *Value, config *Config) bool {
b := v.Block
_ = b
// match: (Zero (Load (OffPtr [c] (SP)) mem) mem)
// cond: mem.Op == OpStaticCall && isSameSym(mem.Aux, "runtime.newobject") && c == config.ctxt.FixedFrameSize() + config.PtrSize
// cond: mem.Op == OpStaticCall && isSameSym(mem.Aux, "runtime.newobject") && c == config.ctxt.FixedFrameSize() + config.RegSize
// result: mem
for {
v_0 := v.Args[0]
@ -17230,7 +17230,7 @@ func rewriteValuegeneric_OpZero(v *Value, config *Config) bool {
if mem != v.Args[1] {
break
}
if !(mem.Op == OpStaticCall && isSameSym(mem.Aux, "runtime.newobject") && c == config.ctxt.FixedFrameSize()+config.PtrSize) {
if !(mem.Op == OpStaticCall && isSameSym(mem.Aux, "runtime.newobject") && c == config.ctxt.FixedFrameSize()+config.RegSize) {
break
}
v.reset(OpCopy)