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cmd/compile: ignore types when considering tuple select for CSE
Fixes #20097 Change-Id: I3c9626ccc8cd0c46a7081ea8650b2ff07a5d4fcd Reviewed-on: https://go-review.googlesource.com/41505 Run-TryBot: Todd Neal <todd@tneal.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Keith Randall <khr@golang.org>
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@ -322,9 +322,13 @@ func cmpVal(v, w *Value, auxIDs auxmap) types.Cmp {
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// that generate memory.
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return lt2Cmp(v.ID < w.ID)
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}
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if tc := v.Type.Compare(w.Type); tc != types.CMPeq {
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return tc
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// OpSelect is a pseudo-op. We need to be more agressive
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// regarding CSE to keep multiple OpSelect's of the same
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// argument from existing.
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if v.Op != OpSelect0 && v.Op != OpSelect1 {
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if tc := v.Type.Compare(w.Type); tc != types.CMPeq {
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return tc
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}
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}
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if v.Aux != w.Aux {
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18
test/fixedbugs/issue20097.go
Normal file
18
test/fixedbugs/issue20097.go
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@ -0,0 +1,18 @@
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// compile
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// Copyright 2017 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Issue 20097: ensure that we CSE multiple Select ops with
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// the same underlying type
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package main
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type T int64
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func f(x, y int64) (int64, T) {
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a := x / y
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b := T(x) / T(y)
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return a, b
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}
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