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cmd/compile: add boolean simplification rules

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These collectively fire a few hundred times during make.bash,
mostly rewriting XOR SETNE -> SETEQ.

Fixes #17905.

Change-Id: Ic5eb241ee93ed67099da3de11f59e4df9fab64a3
Reviewed-on: https://go-review.googlesource.com/42491
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
This commit is contained in:
Josh Bleecher Snyder 2017-05-02 16:43:27 -07:00
parent 9aeced650f
commit 6a24b2d0c1
4 changed files with 215 additions and 1 deletions
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38
src/cmd/compile/internal/ssa/rewritegeneric.go
View file

@ -14573,6 +14573,44 @@ func rewriteValuegeneric_OpNeqB_0(v *Value) bool {
v.AddArg(x)
return true
}
// match: (NeqB (Not x) (Not y))
// cond:
// result: (NeqB x y)
for {
v_0 := v.Args[0]
if v_0.Op != OpNot {
break
}
x := v_0.Args[0]
v_1 := v.Args[1]
if v_1.Op != OpNot {
break
}
y := v_1.Args[0]
v.reset(OpNeqB)
v.AddArg(x)
v.AddArg(y)
return true
}
// match: (NeqB (Not y) (Not x))
// cond:
// result: (NeqB x y)
for {
v_0 := v.Args[0]
if v_0.Op != OpNot {
break
}
y := v_0.Args[0]
v_1 := v.Args[1]
if v_1.Op != OpNot {
break
}
x := v_1.Args[0]
v.reset(OpNeqB)
v.AddArg(x)
v.AddArg(y)
return true
}
return false
}
func rewriteValuegeneric_OpNeqInter_0(v *Value) bool {