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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 <[email protected]>
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