issue43099.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  // Check to make sure we don't try to constant fold a divide by zero.
     8  // This is a tricky test, as we need a value that's not recognized as 0
     9  // until lowering (otherwise it gets handled in a different path).
    10  
    11  package p
    12  
    13  func f() {
    14  	var i int
    15  	var s string
    16  	for i > 0 {
    17  		_ = s[0]
    18  		i++
    19  	}
    20  
    21  	var c chan int
    22  	c <- 1 % i
    23  }
    24  
    25  func f32() uint32 {
    26  	s := "\x00\x00\x00\x00"
    27  	c := uint32(s[0]) | uint32(s[1])<<8 | uint32(s[2])<<16 | uint32(s[3])<<24
    28  	return 1 / c
    29  }
    30  func f64() uint64 {
    31  	s := "\x00\x00\x00\x00\x00\x00\x00\x00"
    32  	c := uint64(s[0]) | uint64(s[1])<<8 | uint64(s[2])<<16 | uint64(s[3])<<24 | uint64(s[4])<<32 | uint64(s[5])<<40 | uint64(s[6])<<48 | uint64(s[7])<<56
    33  	return 1 / c
    34  }
    35
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