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| author | Jakub Jelinek <jakub@redhat.com> | 2020-06-05 10:44:23 +0200 |
|---|---|---|
| committer | Jakub Jelinek <jakub@redhat.com> | 2020-06-05 10:44:23 +0200 |
| commit | 892b51cb73f24157391cd18c2215e8d703af97e7 (patch) | |
| tree | 5af3103be0686d948e27665b20706a2d9d1d0189 /gcc/expr.c | |
| parent | 6ea6c4978111d146db8d33c80d9da93d7bd2bc8d (diff) | |
| download | gcc-892b51cb73f24157391cd18c2215e8d703af97e7.zip gcc-892b51cb73f24157391cd18c2215e8d703af97e7.tar.gz gcc-892b51cb73f24157391cd18c2215e8d703af97e7.tar.bz2 | |
ix86: Improve __builtin_c[lt]z followed by extension [PR95535]
In January I've added patterns to optimize SImode -> DImode sign or zero
extension of __builtin_popcount, this patch does the same for
__builtin_c[lt]z. Like most other instructions, the [tl]zcntl instructions
clear the upper 32 bits of the destination register and as the instructions
only result in values 0 to 32 inclusive, both sign and zero extensions
behave the same.
2020-06-05 Jakub Jelinek <jakub@redhat.com>
PR target/95535
* config/i386/i386.md (*ctzsi2_zext, *clzsi2_lzcnt_zext): New
define_insn_and_split patterns.
(*ctzsi2_zext_falsedep, *clzsi2_lzcnt_zext_falsedep): New
define_insn patterns.
* gcc.target/i386/pr95535-1.c: New test.
* gcc.target/i386/pr95535-2.c: New test.
Diffstat (limited to 'gcc/expr.c')
0 files changed, 0 insertions, 0 deletions