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In expand_calls, when rewriting OpArg to OpArgIntReg/OpArgFloatReg, avoid generating duplicates. Otherwise it will confuse the register allocator: it would think the second occurance clobbers the first's register, causing it to generate copies, which may clobber other args. Change-Id: I4f1dc0519afb77500eae1c0e6ac8745e51f7aa4e Reviewed-on: https://go-review.googlesource.com/c/go/+/306029 Trust: Cherry Zhang <cherryyz@google.com> Reviewed-by: Than McIntosh <thanm@google.com> Reviewed-by: David Chase <drchase@google.com>
30 lines
587 B
Go
30 lines
587 B
Go
// run
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// Copyright 2021 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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// When the function Store an Arg and also use it in another place,
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// be sure not to generate duplicated OpArgXXXReg values, which confuses
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// the register allocator.
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package main
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//go:noinline
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//go:registerparams
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func F(x, y float32) {
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if x < 0 {
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panic("FAIL")
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}
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g = [4]float32{x, y, x, y}
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}
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var g [4]float32
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func main() {
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F(1, 2)
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if g[0] != 1 || g[1] != 2 || g[2] != 1 || g[3] != 2 {
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panic("FAIL")
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}
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}
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