x64: Fix ISA requirement for pmaddubsw#6629
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alexcrichton merged 3 commits intoJun 23, 2023
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This was erroneously listed as SSE2 but this is actually an SSSE3 instruction. This commit updates the ISA requirement as well as related lowerings to have everything work with an SSE2 baseline as well which is mostly plumbing to make sure the relaxed-simd dot product instructions use it when it's available but otherwise fall-back to the deterministic lowering.
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This was erroneously listed as SSE2 but this is actually an SSSE3 instruction. This commit updates the ISA requirement as well as related lowerings to have everything work with an SSE2 baseline as well which is mostly plumbing to make sure the relaxed-simd dot product instructions use it when it's available but otherwise fall-back to the deterministic lowering.