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runtime: Reduce testing for fastlog2 implementation

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The current fastlog2 testing checks all 64M values in the domain of
interest, which is too much for platforms with no native floating point.

Reduce testing under testing.Short() to speed up builds for those platforms.

Related to #12620

Change-Id: Ie5dcd408724ba91c3b3fcf9ba0dddedb34706cd1
Reviewed-on: https://go-review.googlesource.com/15830
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Joel Sing <jsing@google.com>
Reviewed-by: Minux Ma <minux@golang.org>
Run-TryBot: Minux Ma <minux@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Raul Silvera 2015-10-13 19:49:40 -07:00 committed by Minux Ma
parent a6f69b31e0
commit 1d765b77a0
1 changed files with 7 additions and 1 deletions
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8
src/runtime/fastlog2_test.go
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@ -15,7 +15,13 @@ func TestFastLog2(t *testing.T) {
// implementation over the range of interest for heap sampling.
const randomBitCount = 26
var e float64
for i := 1; i < 1<<randomBitCount; i++ {
inc := 1
if testing.Short() {
// Check 1K total values, down from 64M.
inc = 1 << 16
}
for i := 1; i < 1<<randomBitCount; i += inc {
l, fl := math.Log2(float64(i)), runtime.Fastlog2(float64(i))
d := l - fl
e += d * d