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math: test portable FMA even on system with hardware FMA

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This makes it a little less likely the portable FMA will be
broken without realizing it.

Change-Id: I7f7f4509b35160a9709f8b8a0e494c09ea6e410a
Reviewed-on: https://go-review.googlesource.com/c/go/+/205337
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
This commit is contained in:
Russ Cox 2019-11-04 20:36:21 -05:00
parent 543c6d2e0d
commit e8f01d591f
1 changed files with 6 additions and 0 deletions
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6
src/math/all_test.go
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@ -3053,12 +3053,18 @@ func TestYn(t *testing.T) {
} }
} }
var PortableFMA = FMA // hide call from compiler intrinsic; falls back to portable code
func TestFMA(t *testing.T) { func TestFMA(t *testing.T) {
for _, c := range fmaC { for _, c := range fmaC {
got := FMA(c.x, c.y, c.z) got := FMA(c.x, c.y, c.z)
if !alike(got, c.want) { if !alike(got, c.want) {
t.Errorf("FMA(%g,%g,%g) == %g; want %g", c.x, c.y, c.z, got, c.want) t.Errorf("FMA(%g,%g,%g) == %g; want %g", c.x, c.y, c.z, got, c.want)
} }
got = PortableFMA(c.x, c.y, c.z)
if !alike(got, c.want) {
t.Errorf("PortableFMA(%g,%g,%g) == %g; want %g", c.x, c.y, c.z, got, c.want)
}
} }
} }