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| author | Simon Pilgrim <llvm-dev@redking.me.uk> | 2018-10-13 13:05:19 +0000 |
|---|---|---|
| committer | Simon Pilgrim <llvm-dev@redking.me.uk> | 2018-10-13 13:05:19 +0000 |
| commit | f64e654d62e64ac4a74a49ac78b5609a8bb548a1 (patch) | |
| tree | 9b0150191ff1c7b3eed0426c5316648be0d14fd9 /lldb/source/Plugins/ScriptInterpreter/Python/ScriptInterpreterPython.cpp | |
| parent | afead139cfcf85c5ebf7e440a7b3105538af87a2 (diff) | |
[X86][SSE] Improve CTTZ lowering when CTLZ is legal
If we have better CTLZ support than CTPOP, then use cttz(x) = width - ctlz(~x & (x - 1)) - and remove the CTTZ_ZERO_UNDEF handling as it no longer gives better codegen.
Similar to rL344447, this is also closer to LegalizeDAG's approach
llvm-svn: 344448
Diffstat (limited to 'lldb/source/Plugins/ScriptInterpreter/Python/ScriptInterpreterPython.cpp')
0 files changed, 0 insertions, 0 deletions