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| author | Sanjay Patel <spatel@rotateright.com> | 2019-06-23 14:22:37 +0000 |
|---|---|---|
| committer | Sanjay Patel <spatel@rotateright.com> | 2019-06-23 14:22:37 +0000 |
| commit | 13a5ae58fcf1386256e56d2dc67c783628c3e0f1 (patch) | |
| tree | af126314af5e3b97bab176e2378b26770a004d20 /lldb/packages/Python/lldbsuite/test/sample_test/TestSampleTest.py | |
| parent | 6620e3b2f6937c6b862407043aa49a1efb6f19df (diff) | |
| download | bcm5719-llvm-13a5ae58fcf1386256e56d2dc67c783628c3e0f1.tar.gz bcm5719-llvm-13a5ae58fcf1386256e56d2dc67c783628c3e0f1.zip | |
[InstCombine] squash is-power-of-2 that uses ctpop
This is another intermediate IR step towards solving PR42314:
https://bugs.llvm.org/show_bug.cgi?id=42314
We can test if a value is power-of-2-or-0 using ctpop(X) < 2,
so combining that with a non-zero check of the input is the
same as testing if exactly 1 bit is set:
(X != 0) && (ctpop(X) u< 2) --> ctpop(X) == 1
Differential Revision: https://reviews.llvm.org/D63660
llvm-svn: 364153
Diffstat (limited to 'lldb/packages/Python/lldbsuite/test/sample_test/TestSampleTest.py')
0 files changed, 0 insertions, 0 deletions
