diff options
| author | Jakub Jelinek <jakub@redhat.com> | 2018-11-14 13:36:59 +0100 |
|---|---|---|
| committer | Jakub Jelinek <jakub@gcc.gnu.org> | 2018-11-14 13:36:59 +0100 |
| commit | 5bfba2b58ddb37c89e0633a2dc48fa8c4430a026 (patch) | |
| tree | 3301ff30b33aa7dca70e7973ded9ef79e67615d8 /gcc/config | |
| parent | ff4d8480403be6ab92e07f6981e7bfc04c3863c9 (diff) | |
| download | gcc-5bfba2b58ddb37c89e0633a2dc48fa8c4430a026.zip gcc-5bfba2b58ddb37c89e0633a2dc48fa8c4430a026.tar.gz gcc-5bfba2b58ddb37c89e0633a2dc48fa8c4430a026.tar.bz2 | |
re PR rtl-optimization/87817 (gcc.target/i386/bmi2-bzhi-2.c execution test)
PR rtl-optimization/87817
* config/i386/i386.c (ix86_fold_builtin): For _bzhi_u{32,64} if
last argument has low 8 bits clear, fold to 0.
* gcc.target/i386/bmi2-bzhi-3.c (main): Add a couple of new tests.
From-SVN: r266140
Diffstat (limited to 'gcc/config')
| -rw-r--r-- | gcc/config/i386/i386.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c index b3e0807..76a92b1 100644 --- a/gcc/config/i386/i386.c +++ b/gcc/config/i386/i386.c @@ -32671,6 +32671,8 @@ ix86_fold_builtin (tree fndecl, int n_args, unsigned int idx = tree_to_uhwi (args[1]) & 0xff; if (idx >= TYPE_PRECISION (TREE_TYPE (args[0]))) return args[0]; + if (idx == 0) + return build_int_cst (TREE_TYPE (TREE_TYPE (fndecl)), 0); if (!tree_fits_uhwi_p (args[0])) break; unsigned HOST_WIDE_INT res = tree_to_uhwi (args[0]); |