diff options
| author | H.J. Lu <hjl.tools@gmail.com> | 2021-08-01 09:55:33 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2021-08-01 13:32:55 -0700 |
| commit | 6f0c43e97825ee54e3779afbedcd0def12443001 (patch) | |
| tree | 96c88229bdbe88003206abe51a0803d7d5f99843 /gcc/tree-ssa-phiopt.c | |
| parent | 8dd16447343890091874c9f588a7fea8c840cf77 (diff) | |
| download | gcc-6f0c43e97825ee54e3779afbedcd0def12443001.zip gcc-6f0c43e97825ee54e3779afbedcd0def12443001.tar.gz gcc-6f0c43e97825ee54e3779afbedcd0def12443001.tar.bz2 | |
i386: Improve SImode constant - __builtin_clzll for -mno-lzcnt
Add a zero_extend patten for bsr_rex64_1 and use it to split SImode
constant - __builtin_clzll to avoid unncessary zero_extend.
gcc/
PR target/78103
* config/i386/i386.md (bsr_rex64_1_zext): New.
(combine splitter for constant - clzll): Replace gen_bsr_rex64_1
with gen_bsr_rex64_1_zext.
gcc/testsuite/
PR target/78103
* gcc.target/i386/pr78103-2.c: Also scan incl.
* gcc.target/i386/pr78103-3.c: Scan leal|addl|incl for x32. Also
scan incq.
Diffstat (limited to 'gcc/tree-ssa-phiopt.c')
0 files changed, 0 insertions, 0 deletions