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| author | Sanjay Patel <spatel@rotateright.com> | 2022-01-07 08:06:51 -0500 |
|---|---|---|
| committer | Sanjay Patel <spatel@rotateright.com> | 2022-01-07 13:23:09 -0500 |
| commit | 68defc013444f21a46757b64e9144bb218c9e7eb (patch) | |
| tree | 060c413190285e1315dce0cce62b50fddf7c9d06 /lldb/source/Plugins/ScriptInterpreter/Python/ScriptInterpreterPython.cpp | |
| parent | fb7cf90071da733e138ae6d39a0dd7efc96438f2 (diff) | |
[x86] make select lowering using SBB hack more flexible
select (X != 0), -1, Y --> 0 - X; or (sbb), Y
select (X != 0), Y, -1 --> X - 1; or (sbb), Y
We already had these x86 carry-flag transforms, but one was over-specified to
handle a "0" select arm only. That's just a special-case of the more general
pattern (the 'or' will be deleted if Y is zero).
This is part of solving #53006, but it misses that example because some other
combine has already converted that exact pattern into math ops.
Differential Revision: https://reviews.llvm.org/D116765
Diffstat (limited to 'lldb/source/Plugins/ScriptInterpreter/Python/ScriptInterpreterPython.cpp')
0 files changed, 0 insertions, 0 deletions