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internal/fuzz: fix TestUnmarshalMarshal on MIPS

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Previous value used in the float32 roundtrip used float32(math.NaN())-1
which caused the quiet/signal bit to flip, which seemed to break the
test on MIPS platforms. Instead switch to using float32(math.NaN())+1,
which preserves the bit and makes the test happy.

Possibly related to #37455
Fixes #51258

Change-Id: Ia85c649e89a5d02027c0ec197f0ff318aa819c19
Reviewed-on: https://go-review.googlesource.com/c/go/+/390214
Trust: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Bryan Mills <bcmills@google.com>
Trust: Roland Shoemaker <roland@golang.org>
Run-TryBot: Roland Shoemaker <roland@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
This commit is contained in:
Roland Shoemaker 2022-03-05 08:47:33 -08:00
parent d1820f748f
commit 63bd6f68e6
1 changed files with 8 additions and 2 deletions
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10
src/internal/fuzz/encoding_test.go
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@ -104,6 +104,12 @@ float32(2.5)`,
ok: true,
},
{
// The two IEEE 754 bit patterns used for the math.Float{64,32}frombits
// encodings are non-math.NAN quiet-NaN values. Since they are not equal
// to math.NaN(), they should be re-encoded to their bit patterns. They
// are, respectively:
// * math.Float64bits(math.NaN())+1
// * math.Float32bits(float32(math.NaN()))+1
in: `go test fuzz v1
float32(-0)
float64(-0)
@ -113,8 +119,8 @@ float32(NaN)
float64(+Inf)
float64(-Inf)
float64(NaN)
math.Float64frombits(9221120237041090560)
math.Float32frombits(2143289343)`,
math.Float64frombits(9221120237041090562)
math.Float32frombits(2143289345)`,
ok: true,
},
}