issue50671.go

     1  // run
     2  
     3  // Copyright 2022 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 50671: sign extension eliminated incorrectly on MIPS64.
     8  
     9  package main
    10  
    11  //go:noinline
    12  func F(x int32) (float64, int64) {
    13  	a := float64(x)
    14  	b := int64(x)
    15  	return a, b
    16  }
    17  
    18  var a, b, c float64
    19  
    20  // Poison some floating point registers with non-zero high bits.
    21  //
    22  //go:noinline
    23  func poison(x float64) {
    24  	a = x - 123.45
    25  	b = a * 1.2
    26  	c = b + 3.4
    27  }
    28  
    29  func main() {
    30  	poison(333.3)
    31  	_, b := F(123)
    32  	if b != 123 {
    33  		panic("FAIL")
    34  	}
    35  }
    36
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