Source file test/fixedbugs/issue26438.go

     1  // run
     2  
     3  // Copyright 2018 The Go Authors. All rights reserved.
     4  // Use of this source code is governed by a BSD-style
     5  // license that can be found in the LICENSE file.
     6  
     7  // Issue 26438: arm64 backend may use 64-bit TST for
     8  // "if uint32(a)&uint32(b) == 0", which should be
     9  // 32-bit TSTW
    10  
    11  package main
    12  
    13  //go:noinline
    14  func tstw(a, b uint64) uint64 {
    15  	if uint32(a)&uint32(b) == 0 {
    16  		return 100
    17  	} else {
    18  		return 200
    19  	}
    20  }
    21  
    22  func main() {
    23  	if tstw(0xff00000000, 0xaa00000000) == 200 {
    24  		panic("impossible")
    25  	}
    26  }
    27  

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