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[dev.typeparams] cmd/compile: implement clobberdead mode on ARM64
For debugging. Change-Id: I5875ccd2413b8ffd2ec97a0ace66b5cae7893b24 Reviewed-on: https://go-review.googlesource.com/c/go/+/324765 Trust: Cherry Mui <cherryyz@google.com> Run-TryBot: Cherry Mui <cherryyz@google.com> Reviewed-by: Than McIntosh <thanm@google.com> TryBot-Result: Go Bot <gobot@golang.org>
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@ -1114,8 +1114,34 @@ func ssaGenValue(s *ssagen.State, v *ssa.Value) {
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v.Fatalf("FlagConstant op should never make it to codegen %v", v.LongString())
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case ssa.OpARM64InvertFlags:
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v.Fatalf("InvertFlags should never make it to codegen %v", v.LongString())
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case ssa.OpClobber, ssa.OpClobberReg:
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// TODO: implement for clobberdead experiment. Nop is ok for now.
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case ssa.OpClobber:
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// MOVW $0xdeaddead, REGTMP
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// MOVW REGTMP, (slot)
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// MOVW REGTMP, 4(slot)
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p := s.Prog(arm64.AMOVW)
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p.From.Type = obj.TYPE_CONST
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p.From.Offset = 0xdeaddead
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p.To.Type = obj.TYPE_REG
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p.To.Reg = arm64.REGTMP
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p = s.Prog(arm64.AMOVW)
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p.From.Type = obj.TYPE_REG
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p.From.Reg = arm64.REGTMP
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p.To.Type = obj.TYPE_MEM
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p.To.Reg = arm64.REGSP
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ssagen.AddAux(&p.To, v)
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p = s.Prog(arm64.AMOVW)
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p.From.Type = obj.TYPE_REG
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p.From.Reg = arm64.REGTMP
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p.To.Type = obj.TYPE_MEM
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p.To.Reg = arm64.REGSP
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ssagen.AddAux2(&p.To, v, v.AuxInt+4)
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case ssa.OpClobberReg:
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x := uint64(0xdeaddeaddeaddead)
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p := s.Prog(arm64.AMOVD)
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p.From.Type = obj.TYPE_CONST
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p.From.Offset = int64(x)
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p.To.Type = obj.TYPE_REG
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p.To.Reg = v.Reg()
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default:
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v.Fatalf("genValue not implemented: %s", v.LongString())
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}
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@ -1,6 +1,6 @@
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// asmcheck -gcflags=-clobberdead
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// +build amd64
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// +build amd64 arm64
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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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@ -13,15 +13,18 @@ type T [2]*int // contain pointer, not SSA-able (so locals are not registerized)
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var p1, p2, p3 T
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func F() {
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// 3735936685 is 0xdeaddead
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// 3735936685 is 0xdeaddead. On ARM64 R27 is REGTMP.
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// clobber x, y at entry. not clobber z (stack object).
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// amd64:`MOVL\t\$3735936685, ""\.x`, `MOVL\t\$3735936685, ""\.y`, -`MOVL\t\$3735936685, ""\.z`
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// arm64:`MOVW\tR27, ""\.x`, `MOVW\tR27, ""\.y`, -`MOVW\tR27, ""\.z`
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x, y, z := p1, p2, p3
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addrTaken(&z)
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// x is dead at the call (the value of x is loaded before the CALL), y is not
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// amd64:`MOVL\t\$3735936685, ""\.x`, -`MOVL\t\$3735936685, ""\.y`
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// arm64:`MOVW\tR27, ""\.x`, -`MOVW\tR27, ""\.y`
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use(x)
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// amd64:`MOVL\t\$3735936685, ""\.x`, `MOVL\t\$3735936685, ""\.y`
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// arm64:`MOVW\tR27, ""\.x`, `MOVW\tR27, ""\.y`
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use(y)
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}
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