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[dev.ssa] cmd/compile: implement "if SETEQ" branches

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Change-Id: I814fd0c2f1a622cca7dfd1b771f81de309a1904c
Reviewed-on: https://go-review.googlesource.com/12441
Reviewed-by: Keith Randall <khr@golang.org>
This commit is contained in:
Josh Bleecher Snyder 2015-07-20 15:53:33 -07:00
parent 2574e4ac1c
commit a402b58e51
2 changed files with 21 additions and 0 deletions
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1
src/cmd/compile/internal/ssa/gen/AMD64.rules
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@ -95,6 +95,7 @@
// block rewrites // block rewrites
(If (SETL cmp) yes no) -> (LT cmp yes no) (If (SETL cmp) yes no) -> (LT cmp yes no)
(If (SETEQ cmp) yes no) -> (EQ cmp yes no)
(If (SETNE cmp) yes no) -> (NE cmp yes no) (If (SETNE cmp) yes no) -> (NE cmp yes no)
(If (SETB cmp) yes no) -> (ULT cmp yes no) (If (SETB cmp) yes no) -> (ULT cmp yes no)
(If cond yes no) && cond.Op == OpAMD64MOVBload -> (NE (TESTB <TypeFlags> cond cond) yes no) (If cond yes no) && cond.Op == OpAMD64MOVBload -> (NE (TESTB <TypeFlags> cond cond) yes no)

20
src/cmd/compile/internal/ssa/rewriteAMD64.go
View File

@ -2142,6 +2142,26 @@ func rewriteBlockAMD64(b *Block) bool {
} }
goto ende4d36879bb8e1bd8facaa8c91ba99dcc goto ende4d36879bb8e1bd8facaa8c91ba99dcc
ende4d36879bb8e1bd8facaa8c91ba99dcc: ende4d36879bb8e1bd8facaa8c91ba99dcc:
;
// match: (If (SETEQ cmp) yes no)
// cond:
// result: (EQ cmp yes no)
{
v := b.Control
if v.Op != OpAMD64SETEQ {
goto endf113deb06abc88613840e6282942921a
}
cmp := v.Args[0]
yes := b.Succs[0]
no := b.Succs[1]
b.Kind = BlockAMD64EQ
b.Control = cmp
b.Succs[0] = yes
b.Succs[1] = no
return true
}
goto endf113deb06abc88613840e6282942921a
endf113deb06abc88613840e6282942921a:
; ;
// match: (If (SETNE cmp) yes no) // match: (If (SETNE cmp) yes no)
// cond: // cond: