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floating point bug

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R=rsc
DELTA=35  (35 added, 0 deleted, 0 changed)
OCL=29442
CL=29444
This commit is contained in:
Robert Griesemer 2009-05-27 09:57:44 -07:00
parent c376d5d7fc
commit fec0c01e7f
2 changed files with 39 additions and 0 deletions
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32
test/bugs/bug154.go Normal file
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@ -0,0 +1,32 @@
// $G $D/$F.go && $L $F.$A && ./$A.out || echo BUG: should not panic
// Copyright 2009 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.
package main
import "fmt"
func f0() string {
const f = 3.141592;
return fmt.Sprintf("%v", float64(f));
}
func f1() string {
const f = 3.141592;
_ := float64(float32(f)); // appears to change the precision of f
return fmt.Sprintf("%v", float64(f));
}
func main() {
r0 := f0();
r1 := f1();
if r0 != r1 {
println("r0 =", r0);
println("r1 =", r1);
panic("r0 and r1 should be the same");
}
}

7
test/golden.out
View File

@ -112,6 +112,13 @@ BUG: should compile
BUG: errchk: bugs/bug153.go:9: error message does not match 'nil' BUG: errchk: bugs/bug153.go:9: error message does not match 'nil'
bugs/bug153.go:9: fatal error: dowidth: unknown type: E-34 bugs/bug153.go:9: fatal error: dowidth: unknown type: E-34
=========== bugs/bug154.go
r0 = 3.141592
r1 = 3.141592025756836
r0 and r1 should be the same
panic PC=xxx
BUG: should not panic
=========== fixedbugs/bug016.go =========== fixedbugs/bug016.go
fixedbugs/bug016.go:7: constant -3 overflows uint fixedbugs/bug016.go:7: constant -3 overflows uint