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When -clobberdeadreg flag is set, the compiler inserts code that clobbers integer registers at call sites. This may be helpful for debugging register ABI. Only implemented on AMD64 for now. Change-Id: Ia203d3f891c30fd95d0103489056fe01d63a2899 Reviewed-on: https://go-review.googlesource.com/c/go/+/302809 Trust: Cherry Zhang <cherryyz@google.com> Run-TryBot: Cherry Zhang <cherryyz@google.com> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: David Chase <drchase@google.com>
34 lines
1.3 KiB
Go
34 lines
1.3 KiB
Go
// asmcheck -gcflags=-clobberdeadreg
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// +build amd64
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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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package codegen
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type S struct {
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a, b, c, d, e, f int
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}
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func F(a, b, c int, d S) {
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// -2401018187971961171 is 0xdeaddeaddeaddead
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// amd64:`MOVQ\t\$-2401018187971961171, AX`, `MOVQ\t\$-2401018187971961171, BX`, `MOVQ\t\$-2401018187971961171, CX`
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// amd64:`MOVQ\t\$-2401018187971961171, DX`, `MOVQ\t\$-2401018187971961171, SI`, `MOVQ\t\$-2401018187971961171, DI`
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// amd64:`MOVQ\t\$-2401018187971961171, R8`, `MOVQ\t\$-2401018187971961171, R9`, `MOVQ\t\$-2401018187971961171, R10`
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// amd64:`MOVQ\t\$-2401018187971961171, R11`, `MOVQ\t\$-2401018187971961171, R12`, `MOVQ\t\$-2401018187971961171, R13`
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// amd64:-`MOVQ\t\$-2401018187971961171, BP` // frame pointer is not clobbered
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StackArgsCall(a, b, c, d)
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// amd64:`MOVQ\t\$-2401018187971961171, R12`, `MOVQ\t\$-2401018187971961171, R13`, `MOVQ\t\$-2401018187971961171, DX`
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// amd64:-`MOVQ\t\$-2401018187971961171, AX`, -`MOVQ\t\$-2401018187971961171, R11` // register args are not clobbered
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RegArgsCall(a, b, c, d)
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}
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//go:noinline
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func StackArgsCall(int, int, int, S) {}
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//go:noinline
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//go:registerparams
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func RegArgsCall(int, int, int, S) {}
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