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| author | Bin Cheng <bin.cheng@arm.com> | 2016-10-13 10:58:26 +0000 |
|---|---|---|
| committer | Bin Cheng <amker@gcc.gnu.org> | 2016-10-13 10:58:26 +0000 |
| commit | 328ba117bab9dfd05bfdde90d3673661d1654e09 (patch) | |
| tree | 51ac8be786c9c0e5cfd50b5aa0cd1b0d601f2548 /gcc/tree-vect-loop.c | |
| parent | 37cf9f4f1c3251d594468e52e41e18433130aba7 (diff) | |
| download | gcc-328ba117bab9dfd05bfdde90d3673661d1654e09.zip gcc-328ba117bab9dfd05bfdde90d3673661d1654e09.tar.gz gcc-328ba117bab9dfd05bfdde90d3673661d1654e09.tar.bz2 | |
tree-vect-loop.c (vect_analyze_loop_2): Check and skip loop if it has no enough iterations for LOOP_VINFO_PEELING_FOR_GAPS.
* tree-vect-loop.c (vect_analyze_loop_2): Check and skip loop if it
has no enough iterations for LOOP_VINFO_PEELING_FOR_GAPS.
gcc/testsuite
* gcc.dg/vect/vect-98.c: Refine test case.
* gcc.dg/vect/vect-strided-a-u8-i8-gap2.c: Increase niters.
* gcc.dg/vect/vect-strided-u8-i8-gap2.c: Ditto.
* gcc.dg/vect/vect-strided-u8-i8-gap4.c: Ditto.
From-SVN: r241097
Diffstat (limited to 'gcc/tree-vect-loop.c')
| -rw-r--r-- | gcc/tree-vect-loop.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/gcc/tree-vect-loop.c b/gcc/tree-vect-loop.c index 7b0431e..be6f3fb 100644 --- a/gcc/tree-vect-loop.c +++ b/gcc/tree-vect-loop.c @@ -2059,6 +2059,25 @@ start_over: return false; } + /* If epilog loop is required because of data accesses with gaps, + one additional iteration needs to be peeled. Check if there is + enough iterations for vectorization. */ + if (LOOP_VINFO_PEELING_FOR_GAPS (loop_vinfo) + && LOOP_VINFO_NITERS_KNOWN_P (loop_vinfo)) + { + int vf = LOOP_VINFO_VECT_FACTOR (loop_vinfo); + tree scalar_niters = LOOP_VINFO_NITERSM1 (loop_vinfo); + + if (wi::to_widest (scalar_niters) < vf) + { + if (dump_enabled_p ()) + dump_printf_loc (MSG_NOTE, vect_location, + "loop has no enough iterations to support" + " peeling for gaps.\n"); + return false; + } + } + /* Analyze cost. Decide if worth while to vectorize. */ int min_profitable_estimate, min_profitable_iters; vect_estimate_min_profitable_iters (loop_vinfo, &min_profitable_iters, |