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cmd/compile: simplify zcse

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Minor refactoring.

Passes toolstash-check.

Change-Id: I91e981bf369d4b719163107644fa58f583356c25
Reviewed-on: https://go-review.googlesource.com/c/go/+/229598
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Josh Bleecher Snyder 2020-04-22 21:34:48 -07:00
parent 708ac9aacb
commit 806318d6ad
1 changed files with 2 additions and 7 deletions
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9
src/cmd/compile/internal/ssa/zcse.go
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@ -15,9 +15,8 @@ func zcse(f *Func) {
vals := make(map[vkey]*Value)
for _, b := range f.Blocks {
for i := 0; i < len(b.Values); {
for i := 0; i < len(b.Values); i++ {
v := b.Values[i]
next := true
if opcodeTable[v.Op].argLen == 0 {
key := vkey{v.Op, keyFor(v), v.Aux, v.Type}
if vals[key] == nil {
@ -33,14 +32,10 @@ func zcse(f *Func) {
b.Values[last] = nil
b.Values = b.Values[:last]
// process b.Values[i] again
next = false
i-- // process b.Values[i] again
}
}
}
if next {
i++
}
}
}