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| author | Robert Griesemer <gri@golang.org> | 2015-02-24 11:24:27 -0800 |
|---|---|---|
| committer | Robert Griesemer <gri@golang.org> | 2015-02-24 21:30:04 +0000 |
| commit | c651fdc0cf2ba7986ce0a0a23b4dbb44b6ecdae3 (patch) | |
| tree | fc2fc44c0ef6a76ec146b68f7d47fd622016f5c9 /src/math/big/float_test.go | |
| parent | aff84b171c4188cc79bc23bffa3b284b6c02c2d7 (diff) | |
| download | go-c651fdc0cf2ba7986ce0a0a23b4dbb44b6ecdae3.tar.xz | |
math/big: change Float.SetMantExp to always multiply mant by 2**exp
Change-Id: If840e647376a2141f8c17729f7ef251bfff13f5f
Reviewed-on: https://go-review.googlesource.com/5810
Reviewed-by: Rob Pike <r@golang.org>
Diffstat (limited to 'src/math/big/float_test.go')
| -rw-r--r-- | src/math/big/float_test.go | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/src/math/big/float_test.go b/src/math/big/float_test.go index 2789cfb9f3..6714a92bf0 100644 --- a/src/math/big/float_test.go +++ b/src/math/big/float_test.go @@ -167,11 +167,17 @@ func TestFloatSetMantExp(t *testing.T) { {"+Inf", -1234, "+Inf"}, {"-Inf", -1234, "-Inf"}, {"0", -MaxExp - 1, "0"}, - {"1", -MaxExp - 1, "+Inf"}, // exponent magnitude too large - {"-1", -MaxExp - 1, "-Inf"}, // exponent magnitude too large + {"0.5", -MaxExp - 1, "+Inf"}, // exponent overflow + {"-0.5", -MaxExp - 1, "-Inf"}, // exponent overflow + {"0.5", MaxExp + 1, "+Inf"}, // exponent overflow + {"-0.5", MaxExp + 1, "-Inf"}, // exponent overflow + {"1", MaxExp, "+Inf"}, // exponent overflow + {"2", MaxExp - 1, "+Inf"}, // exponent overflow {"0.75", 1, "1.5"}, {"0.5", 11, "1024"}, {"-0.5", -2, "-0.125"}, + {"32", 5, "1024"}, + {"1024", -10, "1"}, } { frac := makeFloat(test.frac) want := makeFloat(test.z) @@ -180,6 +186,10 @@ func TestFloatSetMantExp(t *testing.T) { if !feq(&z, want) { t.Errorf("SetMantExp(%s, %d) = %s; want %s", test.frac, test.exp, z.Format('g', 10), test.z) } + // test inverse property + if z.SetMantExp(want.MantExp()).Cmp(want) != 0 { + t.Errorf("Inverse property not satisfied: got %s; want %s", z.Format('g', 10), test.z) + } } } |