diff options
| author | Richard Biener <rguenther@suse.de> | 2019-12-05 13:02:57 +0000 |
|---|---|---|
| committer | Richard Biener <rguenth@gcc.gnu.org> | 2019-12-05 13:02:57 +0000 |
| commit | b0a71a184c6e2ec2cdf5eed90308d4e96fb1beda (patch) | |
| tree | 017581cfcaebd81bd790d173af7224a41d44a392 /gcc/tree-ssa-forwprop.c | |
| parent | f1355c8ddab619f0e5fae40cbdca33d468780b58 (diff) | |
| download | gcc-b0a71a184c6e2ec2cdf5eed90308d4e96fb1beda.zip gcc-b0a71a184c6e2ec2cdf5eed90308d4e96fb1beda.tar.gz gcc-b0a71a184c6e2ec2cdf5eed90308d4e96fb1beda.tar.bz2 | |
re PR tree-optimization/92818 (Typo in vec_perm -> bit_insert pattern)
2019-12-05 Richard Biener <rguenther@suse.de>
PR middle-end/92818
* tree-ssa-forwprop.c (simplify_vector_constructor): Improve
heuristics on what don't care element to choose.
* match.pd (VEC_PERM_EXPR -> BIT_INSERT_EXPR): Fix typo.
* gcc.target/i386/pr92818.c: New testcase.
From-SVN: r278998
Diffstat (limited to 'gcc/tree-ssa-forwprop.c')
| -rw-r--r-- | gcc/tree-ssa-forwprop.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/gcc/tree-ssa-forwprop.c b/gcc/tree-ssa-forwprop.c index a27a4cf..2f9b089 100644 --- a/gcc/tree-ssa-forwprop.c +++ b/gcc/tree-ssa-forwprop.c @@ -2265,9 +2265,12 @@ simplify_vector_constructor (gimple_stmt_iterator *gsi) sel.quick_push (elts[i].second + elts[i].first * refnelts); /* And fill the tail with "something". It's really don't care, and ideally we'd allow VEC_PERM to have a smaller destination - vector. */ + vector. As heuristic try to preserve a uniform orig[0] which + facilitates later pattern-matching VEC_PERM_EXPR to a + BIT_INSERT_EXPR. */ for (; i < refnelts; ++i) - sel.quick_push (i - elts.length ()); + sel.quick_push ((elts[0].second == 0 && elts[0].first == 0 + ? 0 : refnelts) + i); vec_perm_indices indices (sel, orig[1] ? 2 : 1, refnelts); if (!can_vec_perm_const_p (TYPE_MODE (perm_type), indices)) return false; |