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cmd/compile: run generic deadcode in -N mode
Late opt pass may generate dead stores, which messes up store chain calculation in later passes. Run generic deadcode even in -N mode to remove them. Fixes #26163. Change-Id: I8276101717bb978d5980e6c7998f53fd8d0ae10f Reviewed-on: https://go-review.googlesource.com/121856 Run-TryBot: Cherry Zhang <cherryyz@google.com> Reviewed-by: Keith Randall <khr@golang.org>
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@ -373,7 +373,7 @@ var passes = [...]pass{
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{name: "softfloat", fn: softfloat, required: true},
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{name: "late opt", fn: opt, required: true}, // TODO: split required rules and optimizing rules
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{name: "dead auto elim", fn: elimDeadAutosGeneric},
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{name: "generic deadcode", fn: deadcode},
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{name: "generic deadcode", fn: deadcode, required: true}, // remove dead stores, which otherwise mess up store chain
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{name: "check bce", fn: checkbce},
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{name: "branchelim", fn: branchelim},
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{name: "fuse", fn: fuse},
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17
test/fixedbugs/issue26163.go
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17
test/fixedbugs/issue26163.go
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@ -0,0 +1,17 @@
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// compile -N -d=softfloat
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// Copyright 2018 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 26163: dead store generated in late opt messes
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// up store chain calculation.
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package p
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var i int
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var A = ([]*int{})[i]
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var F func(float64, complex128) int
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var C chan complex128
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var B = F(1, 1+(<-C))
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