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| author | Simon Pilgrim <llvm-dev@redking.me.uk> | 2024-12-18 16:08:45 +0000 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2024-12-18 16:08:45 +0000 |
| commit | 49fd2dde21655f95309abb17ad1d3392afe4985f (patch) | |
| tree | d6d176ab78e62dc61327df86a69cd6daa3eb24c2 /clang/lib/Frontend/InitPreprocessor.cpp | |
| parent | 3eca15cbb9888a992749ddd24f0fb666dad733bf (diff) | |
| download | llvm-49fd2dde21655f95309abb17ad1d3392afe4985f.zip llvm-49fd2dde21655f95309abb17ad1d3392afe4985f.tar.gz llvm-49fd2dde21655f95309abb17ad1d3392afe4985f.tar.bz2 | |
[X86] LowerShift - don't prematurely lower to x86 vector shift imm instructions (#120282)
When splitting 2 unique amount shifts to shuffle(shift(x,c1),shift(x,c2)), don't use getTargetVShiftByConstNode directly to lower, use generic shifts to ensure we make use of any further canonicalization: shl(X,1) to add(X,X) etc. - this can have notably better throughput on some x86 targets.
Noticed on #120270
Diffstat (limited to 'clang/lib/Frontend/InitPreprocessor.cpp')
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