tree 8c55cec54e3e939b51fbdc1f01da711a211f6f03
parent 48eb79ec2197aeea0eb43597b00cad1ebcad61d2
author smasher164 <aindurti@gmail.com> 1571753395 -0400
committer Brad Fitzpatrick <bradfitz@golang.org> 1571773002 +0000

cmd/compile: don't use FMA on plan9

CL 137156 introduces an intrinsic on AMD64 that executes vfmadd231sd
when feature detection is successful. However, because floating-point
isn't allowed in note handler, the builder disables SSE instructions,
and fails when attempting to execute this instruction. This change
disables FMA on plan9 to immediately use the software fallback.

Fixes #35063.

Change-Id: I87d8f0995bd2f15013d203e618938f5079c9eed2
Reviewed-on: https://go-review.googlesource.com/c/go/+/202617
Reviewed-by: Keith Randall <khr@golang.org>