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x64: improve multiplication lowering #2889

Merged
merged 3 commits into from
May 14, 2021
Merged

x64: improve multiplication lowering #2889

merged 3 commits into from
May 14, 2021

Commits on May 13, 2021

  1. x64: move multiplication lowering 

    Since the lowering of `imul` complicated the other ALU operations it was
matched with and since future commits will alter the multiplication
lowering further, this change moves the `imul` lowering to its own match
block.
    @abrown
    abrown committed May 13, 2021
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  2. x64: improve arithmetic filetests

    @abrown
    abrown committed May 13, 2021
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  3. x64: lower i64x2.imul to VPMULLQ when possible 

    This adds the machinery to encode the VPMULLQ instruction which is
available in AVX512VL and AVX512DQ. When these feature sets are
available, we use this instruction instead of a lengthy 12-instruction
sequence.
    @abrown
    abrown committed May 13, 2021
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