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| author | Sanjay Patel <spatel@rotateright.com> | 2021-11-12 08:12:59 -0500 |
|---|---|---|
| committer | Sanjay Patel <spatel@rotateright.com> | 2021-11-12 08:17:46 -0500 |
| commit | bf5748a1af0d2f6f9396d9dc6ac89d15de41eee7 (patch) | |
| tree | c46a40acba7e074b1dd0ba78c5e48cf7ad32cd13 /lldb/source/Plugins/ScriptInterpreter/Python/ScriptInterpreterPython.cpp | |
| parent | ab6ef5872763fd84e714c30467a49ad41d81bafc (diff) | |
| download | llvm-bf5748a1af0d2f6f9396d9dc6ac89d15de41eee7.zip llvm-bf5748a1af0d2f6f9396d9dc6ac89d15de41eee7.tar.gz llvm-bf5748a1af0d2f6f9396d9dc6ac89d15de41eee7.tar.bz2 | |
[x86] fold vector (X > -1) & Y to shift+andn
and (pcmpgt X, -1), Y --> pandn (vsrai X, BitWidth-1), Y
This avoids the -1 constant vector in favor of an arithmetic shift
instruction if it exists (the ISA is still not complete after all
these years...).
We catch this pattern late in combining by matching PCMPGT, so it
should not interfere with more general folds.
Differential Revision: https://reviews.llvm.org/D113603
Diffstat (limited to 'lldb/source/Plugins/ScriptInterpreter/Python/ScriptInterpreterPython.cpp')
0 files changed, 0 insertions, 0 deletions