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| author | Jakub Jelinek <jakub@redhat.com> | 2015-11-24 11:45:52 +0100 |
|---|---|---|
| committer | Jakub Jelinek <jakub@gcc.gnu.org> | 2015-11-24 11:45:52 +0100 |
| commit | 3788cfb513d19a9b36311b1317aff2141a2c6a65 (patch) | |
| tree | 64cec4dd60c911068b6646624ee5ba614d073759 /gcc/optabs.c | |
| parent | 3de2a40ecdfa37efa403d4b46ef116225acb0dc0 (diff) | |
| download | gcc-3788cfb513d19a9b36311b1317aff2141a2c6a65.zip gcc-3788cfb513d19a9b36311b1317aff2141a2c6a65.tar.gz gcc-3788cfb513d19a9b36311b1317aff2141a2c6a65.tar.bz2 | |
re PR target/68483 (gcc 5.2: suboptimal code compared to 4.9)
PR target/68483
* tree-vect-generic.c (lower_vec_perm): If VEC_PERM_EXPR
is valid vec_shr pattern, don't lower it even if can_vec_perm_p
returns false.
* optabs.c (shift_amt_for_vec_perm_mask): Return NULL_RTX
whenever first is nelt or above. Don't mask expected with
2 * nelt - 1.
* gcc.target/i386/pr68483-1.c: New test.
* gcc.target/i386/pr68483-2.c: New test.
From-SVN: r230797
Diffstat (limited to 'gcc/optabs.c')
| -rw-r--r-- | gcc/optabs.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/gcc/optabs.c b/gcc/optabs.c index 5545302..40ef582 100644 --- a/gcc/optabs.c +++ b/gcc/optabs.c @@ -5232,12 +5232,12 @@ shift_amt_for_vec_perm_mask (rtx sel) return NULL_RTX; first = INTVAL (CONST_VECTOR_ELT (sel, 0)); - if (first >= 2*nelt) + if (first >= nelt) return NULL_RTX; for (i = 1; i < nelt; i++) { int idx = INTVAL (CONST_VECTOR_ELT (sel, i)); - unsigned int expected = (i + first) & (2 * nelt - 1); + unsigned int expected = i + first; /* Indices into the second vector are all equivalent. */ if (idx < 0 || (MIN (nelt, (unsigned) idx) != MIN (nelt, expected))) return NULL_RTX; |