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| author | Craig Topper <craig.topper@sifive.com> | 2022-07-18 09:10:53 -0700 |
|---|---|---|
| committer | Craig Topper <craig.topper@sifive.com> | 2022-07-18 09:55:01 -0700 |
| commit | 7c0b9b379b0e36ec1ed76ab5a4386e80dafd53fc (patch) | |
| tree | ca33878bc02ae9914e865b54f9d02c4ef2d71790 /lldb/source/Plugins/ScriptInterpreter/Python/ScriptInterpreterPython.cpp | |
| parent | 1586075a00bfae764db60ad23a2b58cc1007061d (diff) | |
[RISCV] Add isel patterns for ineg+setge/le/uge/ule.
setge/le/uge/ule selected by themselves require an xori with 1.
If we're negating the setcc, we can fold the xori with the neg
to create an addi with -1.
This works because xori X, 1 is equivalent to 1 - X if X is either
0 or 1. So we're doing -(1 - X) which is X-1 or X+-1.
This improves the code for selecting between 0 and -1 based on a
condition for some conditions.
Reviewed By: asb
Differential Revision: https://reviews.llvm.org/D129957
Diffstat (limited to 'lldb/source/Plugins/ScriptInterpreter/Python/ScriptInterpreterPython.cpp')
0 files changed, 0 insertions, 0 deletions