x64: Improve codegen for splats#6025
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This commit goes through the lowerings for the CLIF `splat` instruction
and improves the support for each operator. Many of these lowerings are
mirrored from v8/SpiderMonkey and there are a number of improvements:
* AVX2 `v{p,}broadcast*` instructions are added and used when available.
* Float-based splats are much simpler and always a single-instruction
* Integer-based splats don't insert into an uninit xmm value and instead
start out with a `movd` to move into an `xmm` register. This
thoeretically breaks dependencies with prior instructions since `movd`
creates a fresh new value in the destination register.
* Loads are now sunk into all of the instructions. A new extractor,
`sinkable_load_exact`, was added to sink the i8/i16 loads.
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This commit goes through the lowerings for the CLIF
splatinstruction and improves the support for each operator. Many of these lowerings are mirrored from v8/SpiderMonkey and there are a number of improvements:v{p,}broadcast*instructions are added and used when available.movdto move into anxmmregister. This thoeretically breaks dependencies with prior instructions sincemovdcreates a fresh new value in the destination register.sinkable_load_exact, was added to sink the i8/i16 loads.