issue38356.go

     1  // compile
     2  
     3  // Copyright 2020 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  // Make sure floating point operations that generate flags
     8  // are scheduled correctly on s390x.
     9  
    10  package p
    11  
    12  func f1(x, y float64, z int) float64 {
    13  	a := x + y  // generate flags
    14  	if z == 0 { // create basic block that does not clobber flags
    15  		return a
    16  	}
    17  	if a > 0 { // use flags in different basic block
    18  		return y
    19  	}
    20  	return x
    21  }
    22  
    23  func f2(x, y float64, z int) float64 {
    24  	a := x - y  // generate flags
    25  	if z == 0 { // create basic block that does not clobber flags
    26  		return a
    27  	}
    28  	if a > 0 { // use flags in different basic block
    29  		return y
    30  	}
    31  	return x
    32  }
    33  
    34  func f3(x, y float32, z int) float32 {
    35  	a := x + y  // generate flags
    36  	if z == 0 { // create basic block that does not clobber flags
    37  		return a
    38  	}
    39  	if a > 0 { // use flags in different basic block
    40  		return y
    41  	}
    42  	return x
    43  }
    44  
    45  func f4(x, y float32, z int) float32 {
    46  	a := x - y  // generate flags
    47  	if z == 0 { // create basic block that does not clobber flags
    48  		return a
    49  	}
    50  	if a > 0 { // use flags in different basic block
    51  		return y
    52  	}
    53  	return x
    54  }
    55
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