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[dev.ssa] cmd/compile: implement lowering of constant bools

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Change-Id: Ia56ee9798eefe123d4da04138a6a559d2c25ddf3
Reviewed-on: https://go-review.googlesource.com/12312
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Josh Bleecher Snyder 2015-07-16 13:12:57 -06:00
parent 766bcc92a5
commit 8adc905a10
2 changed files with 38 additions and 0 deletions
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2
src/cmd/compile/internal/ssa/gen/AMD64.rules
View File

@ -77,6 +77,8 @@
(Const <t> [val]) && t.IsInteger() -> (MOVQconst [val])
(Const <t>) && t.IsPtr() -> (MOVQconst [0]) // nil is the only const pointer
(Const <t>) && t.IsBoolean() && !v.Aux.(bool) -> (MOVQconst [0])
(Const <t>) && t.IsBoolean() && v.Aux.(bool) -> (MOVQconst [1])
(Addr {sym} base) -> (LEAQ {sym} base)

36
src/cmd/compile/internal/ssa/rewriteAMD64.go
View File

@ -517,6 +517,42 @@ func rewriteValueAMD64(v *Value, config *Config) bool {
goto endd23abe8d7061f11c260b162e24eec060
endd23abe8d7061f11c260b162e24eec060:
;
// match: (Const <t>)
// cond: t.IsBoolean() && !v.Aux.(bool)
// result: (MOVQconst [0])
{
t := v.Type
if !(t.IsBoolean() && !v.Aux.(bool)) {
goto end7b1347fd0902b990ee1e49145c7e8c31
}
v.Op = OpAMD64MOVQconst
v.AuxInt = 0
v.Aux = nil
v.resetArgs()
v.AuxInt = 0
return true
}
goto end7b1347fd0902b990ee1e49145c7e8c31
end7b1347fd0902b990ee1e49145c7e8c31:
;
// match: (Const <t>)
// cond: t.IsBoolean() && v.Aux.(bool)
// result: (MOVQconst [1])
{
t := v.Type
if !(t.IsBoolean() && v.Aux.(bool)) {
goto ende0d1c954b5ab5af7227bff9635774f1c
}
v.Op = OpAMD64MOVQconst
v.AuxInt = 0
v.Aux = nil
v.resetArgs()
v.AuxInt = 1
return true
}
goto ende0d1c954b5ab5af7227bff9635774f1c
ende0d1c954b5ab5af7227bff9635774f1c:
;
case OpConvNop:
// match: (ConvNop <t> x)
// cond: t == x.Type