| commit | e2429619605951b137e25f6a51fbc39d9f0f1e9b | [log] [tgz] |
|---|---|---|
| author | Austin Clements <austin@google.com> | Tue Jan 13 14:18:14 2026 -0500 |
| committer | Cherry Mui <cherryyz@google.com> | Tue Jan 13 12:33:31 2026 -0800 |
| tree | 184119a0fc7c53b16284693f190645b0ef77ae98 | |
| parent | 9ef1692c93bf96328bcaf7a5c8a46094748da7f3 [diff] |
simd/archsimd: 128- and 256-bit FMA operations do not require AVX-512 Currently, all FMA operations are marked as requiring AVX512, even on smaller vector widths. This is happening because the narrower FMA operations are marked as extension "FMA" in the XED. Since this extension doesn't start with "AVX", we filter them out very early in the XED process. However, this is just a quirk of naming: the FMA feature depends on the AVX feature, so it is part of AVX, even if it doesn't say so on the tin. Fix this by accepting the FMA extension and adding FMA to the table of CPU features. We also tweak internal/cpu slightly do it correctly enforces that the logical FMA feature depends on both the FMA and AVX CPUID flags. This actually *deletes* a lot of generated code because we no longer need the AVX-512 encoding of these 128- and 256-bit operations. Change-Id: I744a18d0be888f536ac034fe88b110347622be7e Reviewed-on: https://go-review.googlesource.com/c/go/+/736160 Auto-Submit: Austin Clements <austin@google.com> Reviewed-by: Junyang Shao <shaojunyang@google.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-on: https://go-review.googlesource.com/c/go/+/736201 Reviewed-by: Austin Clements <austin@google.com>
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