f38e968aba
Zeroing the upper part of X15 may make the CPU think it is "dirty" and slow down SSE operations. For now, just not zeroing the upper part, and construct a zero value on the fly if we need a 256- or 512-bit zero value. Maybe VZEROUPPER works better than explicitly zeroing X15, but we need to evaluate. Long term, we probably want to move more things from SSE to AVX. This essentially undoes CL 698237 and CL 698238, except keeping using X15 for 128-bit zeroing for SIMD. Change-Id: I1564e6332c4c57f9721397c92c7c734c5497534c Reviewed-on: https://go-review.googlesource.com/c/go/+/728240 LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: David Chase <drchase@google.com>
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