18 lines
570 B
Go
18 lines
570 B
Go
// compile -d=ssa/check/on
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// Copyright 2020 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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package main
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func f() uint32 {
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s := "food"
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x := uint32(s[0]) + uint32(s[1])<<8 + uint32(s[2])<<16 + uint32(s[3])<<24
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// x is a constant, but that's not known until lowering.
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// shifting it by 8 moves the high byte up into the high 32 bits of
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// a 64-bit word. That word is not properly sign-extended by the faulty
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// rule, which causes the compiler to fail.
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return x << 8
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}
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