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| author | Richard Biener <rguenther@suse.de> | 2013-08-30 07:49:54 +0000 |
|---|---|---|
| committer | Richard Biener <rguenth@gcc.gnu.org> | 2013-08-30 07:49:54 +0000 |
| commit | 6e8dad054f8de5c33f3837c84b4f4be57e83e7da (patch) | |
| tree | 9baa757b816ea5da995a2df264ff63a6edb8bb25 /gcc/tree-vect-data-refs.c | |
| parent | 062ef2c8f95540fd997e57f6d8945d307ededc81 (diff) | |
| download | gcc-6e8dad054f8de5c33f3837c84b4f4be57e83e7da.tar.gz | |
re PR tree-optimization/58228 (wrong code (with vectorization?) at -O3 on x86_64-linux-gnu)
2013-08-30 Richard Biener <rguenther@suse.de>
PR tree-optimization/58228
* tree-vect-data-refs.c (vect_analyze_data_ref_access): Do not
allow invariant loads in nested loop vectorization.
* gcc.dg/torture/pr58228.c: New testcase.
From-SVN: r202097
Diffstat (limited to 'gcc/tree-vect-data-refs.c')
| -rw-r--r-- | gcc/tree-vect-data-refs.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/gcc/tree-vect-data-refs.c b/gcc/tree-vect-data-refs.c index 4c12f493916..7ebdcfe53cf 100644 --- a/gcc/tree-vect-data-refs.c +++ b/gcc/tree-vect-data-refs.c @@ -2271,10 +2271,17 @@ vect_analyze_data_ref_access (struct data_reference *dr) return false; } - /* Allow invariant loads in loops. */ + /* Allow invariant loads in not nested loops. */ if (loop_vinfo && integer_zerop (step)) { GROUP_FIRST_ELEMENT (vinfo_for_stmt (stmt)) = NULL; + if (nested_in_vect_loop_p (loop, stmt)) + { + if (dump_enabled_p ()) + dump_printf_loc (MSG_NOTE, vect_location, + "zero step in inner loop of nest"); + return false; + } return DR_IS_READ (dr); } |