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| author | Richard Biener <rguenther@suse.de> | 2018-01-26 14:50:25 +0000 |
|---|---|---|
| committer | Richard Biener <rguenth@gcc.gnu.org> | 2018-01-26 14:50:25 +0000 |
| commit | d7e1f499ed046bd1d57eaf4510778d2fc2666653 (patch) | |
| tree | af94a9ed7de3029422c43104fa59e8e934539808 /gcc/dse.c | |
| parent | da1f8d7f12c2efeadb3b127f6274fd0424c32410 (diff) | |
| download | gcc-d7e1f499ed046bd1d57eaf4510778d2fc2666653.zip gcc-d7e1f499ed046bd1d57eaf4510778d2fc2666653.tar.gz gcc-d7e1f499ed046bd1d57eaf4510778d2fc2666653.tar.bz2 | |
re PR rtl-optimization/84003 (FAIL: g++.dg/torture/pr77745.C with noinline foo)
2018-01-26 Richard Biener <rguenther@suse.de>
PR rtl-optimization/84003
* dse.c (record_store): Only record redundant stores when
the earlier store aliases at least all accesses the later one does.
* g++.dg/torture/pr77745.C: Mark foo noinline to trigger
latent bug in DSE if NOINLINE is appropriately defined.
* g++.dg/torture/pr77745-2.C: New testcase including pr77745.C
and defining NOINLINE.
From-SVN: r257091
Diffstat (limited to 'gcc/dse.c')
| -rw-r--r-- | gcc/dse.c | 7 |
1 files changed, 6 insertions, 1 deletions
@@ -1532,7 +1532,12 @@ record_store (rtx body, bb_info_t bb_info) && known_subrange_p (offset, width, s_info->offset, s_info->width) && all_positions_needed_p (s_info, offset - s_info->offset, - width)) + width) + /* We can only remove the later store if the earlier aliases + at least all accesses the later one. */ + && (MEM_ALIAS_SET (mem) == MEM_ALIAS_SET (s_info->mem) + || alias_set_subset_of (MEM_ALIAS_SET (mem), + MEM_ALIAS_SET (s_info->mem)))) { if (GET_MODE (mem) == BLKmode) { |