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cmd/compile: never CSE two memories

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It never makes sense to CSE two ops that generate memory.
We might as well start those ops off in their own partition.

Fixes #15520

Change-Id: I0091ed51640f2c10cd0117f290b034dde7a86721
Reviewed-on: https://go-review.googlesource.com/22741
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Keith Randall 2016-05-03 13:58:28 -07:00
parent 01182425f8
commit b64c7fc683
3 changed files with 4 additions and 17 deletions
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4
src/cmd/compile/internal/gc/subr.go
View File

@ -1118,10 +1118,6 @@ func syslook(name string) *Node {
return s.Def
}
func (s *Sym) IsRuntimeCall(name string) bool {
return s.Pkg == Runtimepkg && s.Name == name
}
// typehash computes a hash value for type t to use in type switch
// statements.
func typehash(t *Type) uint32 {

6
src/cmd/compile/internal/ssa/config.go
View File

@ -116,12 +116,6 @@ type GCNode interface {
String() string
}
// GCSym is an interface that *gc.Sym implements.
// Using *gc.Sym directly would lead to import cycles.
type GCSym interface {
IsRuntimeCall(name string) bool
}
// NewConfig returns a new configuration object for the given architecture.
func NewConfig(arch string, fe Frontend, ctxt *obj.Link, optimize bool) *Config {
c := &Config{arch: arch, fe: fe}

9
src/cmd/compile/internal/ssa/cse.go
View File

@ -257,14 +257,11 @@ func cmpVal(v, w *Value, auxIDs auxmap, depth int) Cmp {
if v.Op == OpPhi && v.Block != w.Block {
return lt2Cmp(v.Block.ID < w.Block.ID)
}
switch v.Op {
case OpStaticCall, OpAMD64CALLstatic, OpARMCALLstatic:
sym := v.Aux.(GCSym)
if sym.IsRuntimeCall("newobject") {
if v.Type.IsMemory() {
// We will never be able to CSE two values
// that generate memory.
return lt2Cmp(v.ID < w.ID)
}
}
if tc := v.Type.Compare(w.Type); tc != CMPeq {
return tc