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Add pointer to PR92772

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2019-12-17  Andrew Stubbs  <ams@codesourcery.com>

	* tree-vect-loop.c (vect_create_epilog_for_reduction): Mention pr92772
	in the comments.

From-SVN: r279460
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Andrew Stubbs 2019-12-17 13:01:36 +00:00 • committed by Andrew Stubbs
parent b92d1124e1
commit 8354bb0ebe
2 changed files with 9 additions and 1 deletions
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gcc/ChangeLog
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@ -1,3 +1,8 @@
2019-12-17 Andrew Stubbs <ams@codesourcery.com>
* tree-vect-loop.c (vect_create_epilog_for_reduction): Mention pr92772
in the comments.
2019-12-17 Andrew Stubbs <ams@codesourcery.com>
* config/gcn/gcn-valu.md (extract_last_<mode>): New expander.

5
gcc/tree-vect-loop.c
View file

@ -4534,7 +4534,10 @@ vect_create_epilog_for_reduction (stmt_vec_info stmt_info,
containing the last time the condition passed for that vector lane.
The first match will be a 1 to allow 0 to be used for non-matching
indexes. If there are no matches at all then the vector will be all
zeroes. */
zeroes.
PR92772: This algorithm is broken for architectures that support
masked vectors, but do not provide fold_extract_last. */
if (STMT_VINFO_REDUC_TYPE (reduc_info) == COND_REDUCTION)
{
auto_vec<std::pair<tree, bool>, 2> ccompares;