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| author | Jakub Jelinek <jakub@redhat.com> | 2020-12-31 11:09:26 +0100 |
|---|---|---|
| committer | Jakub Jelinek <jakub@redhat.com> | 2020-12-31 11:09:26 +0100 |
| commit | d2eb616a0f7bea78164912aa438c29fe1ef5774a (patch) | |
| tree | e8a936a3ca8918db0ea67a25b389229d551e53b8 /gcc/cppdefault.c | |
| parent | 8f12ce2ea3be12de4f83d3c419bdb1dc5036b202 (diff) | |
| download | gcc-d2eb616a0f7bea78164912aa438c29fe1ef5774a.zip gcc-d2eb616a0f7bea78164912aa438c29fe1ef5774a.tar.gz gcc-d2eb616a0f7bea78164912aa438c29fe1ef5774a.tar.bz2 | |
match.pd: Add clz(X) == 0 -> (int)X < 0 etc. simpifications [PR94802]
The following patch adds some clz simplifications. If
clz is 0, then the MSB of the argument is set, and if clz is prec-1, then
the argument is 1.
2020-12-31 Jakub Jelinek <jakub@redhat.com>
PR tree-optimization/94802
* match.pd (clz(X) == 0 -> (int)X < 0): New simplification.
(clz(X) == (prec-1) -> X == 1): Likewise.
* gcc.dg/tree-ssa/pr94802-1.c: New test.
Diffstat (limited to 'gcc/cppdefault.c')
0 files changed, 0 insertions, 0 deletions