clobberdead.go

     1  // asmcheck -gcflags=-clobberdead
     2  
     3  //go:build amd64 || arm64
     4  
     5  // Copyright 2021 The Go Authors. All rights reserved.
     6  // Use of this source code is governed by a BSD-style
     7  // license that can be found in the LICENSE file.
     8  
     9  package codegen
    10  
    11  type T [2]*int // contain pointer, not SSA-able (so locals are not registerized)
    12  
    13  var p1, p2, p3 T
    14  
    15  func F() {
    16  	// 3735936685 is 0xdeaddead. On ARM64 R27 is REGTMP.
    17  	// clobber x, y at entry. not clobber z (stack object).
    18  	// amd64:`MOVL\t\$3735936685, command-line-arguments\.x`, `MOVL\t\$3735936685, command-line-arguments\.y`, -`MOVL\t\$3735936685, command-line-arguments\.z`
    19  	// arm64:`MOVW\tR27, command-line-arguments\.x`, `MOVW\tR27, command-line-arguments\.y`, -`MOVW\tR27, command-line-arguments\.z`
    20  	x, y, z := p1, p2, p3
    21  	addrTaken(&z)
    22  	// x is dead at the call (the value of x is loaded before the CALL), y is not
    23  	// amd64:`MOVL\t\$3735936685, command-line-arguments\.x`, -`MOVL\t\$3735936685, command-line-arguments\.y`
    24  	// arm64:`MOVW\tR27, command-line-arguments\.x`, -`MOVW\tR27, command-line-arguments\.y`
    25  	use(x)
    26  	// amd64:`MOVL\t\$3735936685, command-line-arguments\.x`, `MOVL\t\$3735936685, command-line-arguments\.y`
    27  	// arm64:`MOVW\tR27, command-line-arguments\.x`, `MOVW\tR27, command-line-arguments\.y`
    28  	use(y)
    29  }
    30  
    31  //go:noinline
    32  func use(T) {}
    33  
    34  //go:noinline
    35  func addrTaken(*T) {}
    36
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