diff options
Diffstat (limited to 'test/codegen/clobberdead.go')
| -rw-r--r-- | test/codegen/clobberdead.go | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/test/codegen/clobberdead.go b/test/codegen/clobberdead.go new file mode 100644 index 0000000..732be5f --- /dev/null +++ b/test/codegen/clobberdead.go @@ -0,0 +1,35 @@ +// asmcheck -gcflags=-clobberdead + +// +build amd64 arm64 + +// Copyright 2021 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package codegen + +type T [2]*int // contain pointer, not SSA-able (so locals are not registerized) + +var p1, p2, p3 T + +func F() { + // 3735936685 is 0xdeaddead. On ARM64 R27 is REGTMP. + // clobber x, y at entry. not clobber z (stack object). + // amd64:`MOVL\t\$3735936685, command-line-arguments\.x`, `MOVL\t\$3735936685, command-line-arguments\.y`, -`MOVL\t\$3735936685, command-line-arguments\.z` + // arm64:`MOVW\tR27, command-line-arguments\.x`, `MOVW\tR27, command-line-arguments\.y`, -`MOVW\tR27, command-line-arguments\.z` + x, y, z := p1, p2, p3 + addrTaken(&z) + // x is dead at the call (the value of x is loaded before the CALL), y is not + // amd64:`MOVL\t\$3735936685, command-line-arguments\.x`, -`MOVL\t\$3735936685, command-line-arguments\.y` + // arm64:`MOVW\tR27, command-line-arguments\.x`, -`MOVW\tR27, command-line-arguments\.y` + use(x) + // amd64:`MOVL\t\$3735936685, command-line-arguments\.x`, `MOVL\t\$3735936685, command-line-arguments\.y` + // arm64:`MOVW\tR27, command-line-arguments\.x`, `MOVW\tR27, command-line-arguments\.y` + use(y) +} + +//go:noinline +func use(T) {} + +//go:noinline +func addrTaken(*T) {} |