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master
test/fixedbugs/issue43099.go
34 строки
858 B
Keith Randall
cmd/compile: don't constant fold divide by zero
10 дек 2020, 06:18
10 дек 2020, 06:18
6c64b6d
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// compile // Copyright 2020 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. // Check to make sure we don't try to constant fold a divide by zero. // This is a tricky test, as we need a value that's not recognized as 0 // until lowering (otherwise it gets handled in a different path). package p func f() { var i int var s string for i > 0 { _ = s[0] i++ } var c chan int c <- 1 % i } func f32() uint32 { s := "\x00\x00\x00\x00" c := uint32(s[0]) | uint32(s[1])<<8 | uint32(s[2])<<16 | uint32(s[3])<<24 return 1 / c } func f64() uint64 { s := "\x00\x00\x00\x00\x00\x00\x00\x00" 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 return 1 / c }