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| author | Jessica Paquette <jpaquette@apple.com> | 2020-11-30 17:21:21 -0800 |
|---|---|---|
| committer | Jessica Paquette <jpaquette@apple.com> | 2020-12-01 15:45:14 -0800 |
| commit | 6c3fa97d8a628541c82d8981aabefcb2dcb29f17 (patch) | |
| tree | d6a8647ffe8dc41a49d5d93e847400f24ce6cf67 /lldb/source/Plugins/ScriptInterpreter/Python/ScriptInterpreterPython.cpp | |
| parent | 04424c69bc7b98e1bbd0480ed5cdc251c6c94521 (diff) | |
[AArch64][GlobalISel] Select Bcc when it's better than TB(N)Z
Instead of falling back to selecting TB(N)Z when we fail to select an
optimized compare against 0, select Bcc instead.
Also simplify selectCompareBranch a little while we're here, because the logic
was kind of hard to follow.
At -O0, this is a 0.1% geomean code size improvement for CTMark.
A simple example of where this can kick in is here:
https://godbolt.org/z/4rra6P
In the example above, GlobalISel currently produces a subs, cset, and tbnz.
SelectionDAG, on the other hand, just emits a compare and b.le.
Differential Revision: https://reviews.llvm.org/D92358
Diffstat (limited to 'lldb/source/Plugins/ScriptInterpreter/Python/ScriptInterpreterPython.cpp')
0 files changed, 0 insertions, 0 deletions