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| author | Roman Lebedev <lebedev.ri@gmail.com> | 2020-01-03 15:38:53 +0300 |
|---|---|---|
| committer | Roman Lebedev <lebedev.ri@gmail.com> | 2020-01-03 17:55:45 +0300 |
| commit | 3d492d7503d197246115eb38e7b1b61143d0c99f (patch) | |
| tree | 7f6a9099af90c17c6ee5173c1c26c944500dd065 /clang/test/Preprocessor/assembler-with-cpp.c | |
| parent | e4de8db67eb7a2d64cba078c38f0fd25499013c1 (diff) | |
| download | bcm5719-llvm-3d492d7503d197246115eb38e7b1b61143d0c99f.tar.gz bcm5719-llvm-3d492d7503d197246115eb38e7b1b61143d0c99f.zip | |
[DAGCombine][X86][Thumb2/LowOverheadLoops] `A - (A & C)` -> `A & (~C)` fold (PR44448)
While we do manage to fold integer-typed IR in middle-end,
we can't do that for the main motivational case of pointers.
There is @llvm.ptrmask() intrinsic which may or may not be helpful,
but i'm not sure it is fully considered canonical yet,
not everything is fully aware of it likely.
Name: PR44448 ptr - (ptr & C) -> ptr & (~C)
%bias = and i32 %ptr, C
%r = sub i32 %ptr, %bias
=>
%r = and i32 %ptr, ~C
See
https://bugs.llvm.org/show_bug.cgi?id=44448
https://reviews.llvm.org/D71499
Diffstat (limited to 'clang/test/Preprocessor/assembler-with-cpp.c')
0 files changed, 0 insertions, 0 deletions
