AArch64 SIMD: replace LoadSplat with pattern-matching on load+splat#2376
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cfallin merged 2 commits intobytecodealliance:mainfrom Nov 17, 2020
Merged
AArch64 SIMD: replace LoadSplat with pattern-matching on load+splat#2376cfallin merged 2 commits intobytecodealliance:mainfrom
LoadSplat with pattern-matching on load+splat#2376cfallin merged 2 commits intobytecodealliance:mainfrom
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akirilov-arm
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Nov 7, 2020
abrown
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Nov 9, 2020
abrown
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akirilov-arm
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LGTM, but I haven't reviewed #2366 and I looked just at the AArch64 and common changes.
This was added as an incremental step to improve AArch64 code quality in PR bytecodealliance#2278. At the time, we did not have a way to pattern-match the load + splat opcode sequence that the relevant Wasm opcodes lowered to. However, now with PR bytecodealliance#2366, we can merge effectful instructions such as loads into other ops, and so we can do this pattern matching directly. The pattern-matching update will come in a subsequent commit.
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@julian-seward1 would you be able to review this at at some point soon? It's blocking #2389 and I just had to invest some time to rebase it over some other changes; hoping to get it in to avoid chasing |
julian-seward1
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Nov 17, 2020
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This PR uses the isel changes introduced in #2366 that allows loads to sink and merge with other operations in order to replace the
LoadSplatinstruction with more general pattern-matching.LoadSplatwas added as an incremental step to improve AArch64 code quality in #2278. At the time, we did not have a way to pattern-match the load + splat opcode sequence that the relevant Wasm opcodes lowered to. However, now with PR #2366, we can merge effectful instructions such as loads into other ops, and so we can do this pattern matching directly.PR includes commit from #2366 to allow simultaneous review/CI.
cc @julian-seward1 @akirilov-arm @abrown