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769fda2d51
A missing operand to mergePoint caused lower to place values in the wrong blocks. Includes test, belt+suspenders to do both ssa check and verify the output (was is how the bug was originally observed). The fixed bug here is very likely present in Go versions 1.9-1.12 on amd64 and s390x Fixes #32680. Change-Id: I63e702c4c40602cb795ef71b1691eb704d38ccc7 Reviewed-on: https://go-review.googlesource.com/c/go/+/183059 Run-TryBot: David Chase <drchase@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Cherry Zhang <cherryyz@google.com>
24 lines
687 B
Go
24 lines
687 B
Go
// run -gcflags=-d=ssa/check/on
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// Copyright 2019 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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// As of 2019-06, bug affects/ed amd64 and s390x.
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package main
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var foo = []byte{105, 57, 172, 152}
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func main() {
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for i := 0; i < len(foo); i += 4 {
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// Requires inlining and non-constant i
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// Note the bug/fix also apply to different widths, but was unable to reproduce for those.
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println(readLittleEndian32_2(foo[i], foo[i+1], foo[i+2], foo[i+3]))
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}
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}
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func readLittleEndian32_2(a, b, c, d byte) uint32 {
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return uint32(a) | (uint32(b) << 8) | (uint32(c) << 16) | (uint32(d) << 24)
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}
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