| commit | a46a2c2b7d8daf68c793b6b96f1c5bc009aea62b | [log] [tgz] |
|---|---|---|
| author | Simon Pilgrim <llvm-dev@redking.me.uk> | Tue Jun 25 12:25:56 2024 +0100 |
| committer | GitHub <noreply@github.com> | Tue Jun 25 12:25:56 2024 +0100 |
| tree | d0f347d26f9b15f7ac61c15a5d1e594ea5ffbc6b | |
| parent | 9acb533c38be833ec1d8daa06e127a9de8f0a5ef [diff] |
[X86] Lower vXi8 multiplies using PMADDUBSW on SSSE3+ targets (#95690) Extends https://github.com/llvm/llvm-project/pull/95403 to handle non-constant cases - we can avoid unpacks/extensions from vXi8 to vXi16 by using PMADDUBSW instead and truncating the vXi16 results back together. Most targets benefit from performing this for non-constant cases - its just Intel Core/SandyBridge era CPUs that might experience additional Port0/15 contention (but lower instruction count). Fixes https://github.com/llvm/llvm-project/issues/90748
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