tree 9908934784d3e85d04fdacf8972813e565fae21c
parent 2d94b5e1ee99a22c2fd3bb3b3dd5b4e3be6b3cc6
author Eric Biggers <ebiggers@google.com> 1724196255 +0000
committer Boringssl LUCI CQ <boringssl-scoped@luci-project-accounts.iam.gserviceaccount.com> 1724874599 +0000

Support detecting preference for ymm registers over zmm

Add a CPU capability bit that identifies older Intel CPUs that support
AVX512 but where using zmm registers should be avoided.  This will be
used to select code that uses ymm registers instead.

Change-Id: I6bedc913960d0da3c5f3aae315c81f67da1667b4
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/68909
Reviewed-by: David Benjamin <davidben@google.com>
Reviewed-by: Bob Beck <bbe@google.com>
Commit-Queue: Bob Beck <bbe@google.com>