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Diffstat (limited to 'test/fixedbugs/bug120.go')
-rw-r--r-- | test/fixedbugs/bug120.go | 60 |
1 files changed, 0 insertions, 60 deletions
diff --git a/test/fixedbugs/bug120.go b/test/fixedbugs/bug120.go deleted file mode 100644 index 2a71957d8..000000000 --- a/test/fixedbugs/bug120.go +++ /dev/null @@ -1,60 +0,0 @@ -// $G $D/$F.go && $L $F.$A && ./$A.out || echo BUG: bug120 - -// 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 "os" -import "strconv" - -type Test struct { - f float64 - in string - out string -} - -var tests = []Test{ - Test{123.5, "123.5", "123.5"}, - Test{456.7, "456.7", "456.7"}, - Test{1e23 + 8.5e6, "1e23+8.5e6", "1.0000000000000001e+23"}, - Test{100000000000000008388608, "100000000000000008388608", "1.0000000000000001e+23"}, - Test{1e23 + 8388609, "1e23+8388609", "1.0000000000000001e+23"}, - - // "x" = the floating point value from converting the string x. - // These are exactly representable in 64-bit floating point: - // 1e23-8388608 - // 1e23+8388608 - // The former has an even mantissa, so "1e23" rounds to 1e23-8388608. - // If "1e23+8388608" is implemented as "1e23" + "8388608", - // that ends up computing 1e23-8388608 + 8388608 = 1e23, - // which rounds back to 1e23-8388608. - // The correct answer, of course, would be "1e23+8388608" = 1e23+8388608. - // This is not going to be correct until 6g has multiprecision floating point. - // A simpler case is "1e23+1", which should also round to 1e23+8388608. - Test{1e23 + 8.388608e6, "1e23+8.388608e6", "1.0000000000000001e+23"}, - Test{1e23 + 1, "1e23+1", "1.0000000000000001e+23"}, -} - -func main() { - ok := true - for i := 0; i < len(tests); i++ { - t := tests[i] - v := strconv.Ftoa64(t.f, 'g', -1) - if v != t.out { - println("Bad float64 const:", t.in, "want", t.out, "got", v) - x, err := strconv.Atof64(t.out) - if err != nil { - println("bug120: strconv.Atof64", t.out) - panic("fail") - } - println("\twant exact:", strconv.Ftoa64(x, 'g', 1000)) - println("\tgot exact: ", strconv.Ftoa64(t.f, 'g', 1000)) - ok = false - } - } - if !ok { - os.Exit(1) - } -} |