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  25. 07 Oct, 2020 2 commits
    • Ng Zhi An's avatar
      [wasm-simd][scalar-lowering] Implement the rest of SimdType conversions · b87db517
      Ng Zhi An authored 
      This fills out all possible combinations of SimdType conversions. The
implementation is not the best, it uses existing conversions instead of
creating new specific ones, but is sufficient, since we don't prioritize
performance for lowering.

I added if/else clauses to the existing implementation, so that the diff
is easier to read. I will put up a follow-up to convert it into switch
statements.

Bug: chromium:1134898,v8:10507
Change-Id: I5fcb3597882b0ea3084fdc79eb1dab9b8629044b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2453462
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Reviewed-by: 's avatarBill Budge <bbudge@chromium.org>
Cr-Commit-Position: refs/heads/master@{#70393}
      b87db517
    • Ng Zhi An's avatar
      [wasm-simd] Fix lowering of load transform · f996d50d
      Ng Zhi An authored 
      Load transform nodes can be effect inputs, so we need to update the node
in place. Otherwise, if a load transform node is both an value and an
effect input, only the value input will be updated with replacements,
the effect input will still be the unlowered load transform node.
This is because DefaultLowering only lowers value inputs.

This is consistent with normal loads in the scalar lowering,
and also how int64 does it.

Bug: v8:10984,v8:10507
Change-Id: I04b0f0b1cff95e39589de979ecae6cb4b085a3cf
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2453861Reviewed-by: 's avatarBill Budge <bbudge@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#70391}
      f996d50d
  27. 01 Oct, 2020 1 commit
    • Ng Zhi An's avatar
      [wasm-simd][scalar-lowering] Fix lowering of narrowing · 894bf6df
      Ng Zhi An authored 
      Narrowing operations need to sign extend the result.

E.g. for narrowing uint16 to uint8, we compare uint16 to uint8 max,
0xff. The final result should be 0xffffffff (sign extended) since we
try to keep nodes in their sign extended form, to work well with
the rest of the lowering operations.

With this, we pass the last spec test (that is not ignored),
simd_conversions.

Bug: v8:10507
Change-Id: I8914fd69db9378b8244cba5dcacff98d36893649
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2436613Reviewed-by: 's avatarBill Budge <bbudge@chromium.org>
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#70272}
      894bf6df
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