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[PATCH] Avoid unnecessary block copying in path splitting 

* gimple-ssa-split-paths.c (split_paths): Avoid unnecessary block
	copying.

From-SVN: r231915
This commit is contained in:
Jeff Law 2015-12-22 14:49:12 -07:00 committed by Jeff Law
parent 5634394598
commit 9edb6bb8d3
2 changed files with 9 additions and 5 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2015-12-22 Jeff Law <law@redhat.com>
* gimple-ssa-split-paths.c (split_paths): Avoid unnecessary block
copying.
2015-12-22 Jakub Jelinek <jakub@redhat.com> 2015-12-22 Jakub Jelinek <jakub@redhat.com>
PR c++/67376 PR c++/67376

9
gcc/gimple-ssa-split-paths.c
View File

@ -192,9 +192,10 @@ split_paths ()
/* BB is the merge point for an IF-THEN-ELSE we want to transform. /* BB is the merge point for an IF-THEN-ELSE we want to transform.
Essentially we want to create two duplicates of BB and append Essentially we want to create a duplicate of bb and redirect the
a duplicate to the THEN and ELSE clauses. This will split the first predecessor of BB to the duplicate (leaving the second
path leading to the latch. BB will be unreachable and removed. */ predecessor as is. This will split the path leading to the latch
re-using BB to avoid useless copying. */
if (bb && is_feasible_trace (bb)) if (bb && is_feasible_trace (bb))
{ {
if (dump_file && (dump_flags & TDF_DETAILS)) if (dump_file && (dump_flags & TDF_DETAILS))
@ -202,9 +203,7 @@ split_paths ()
"Duplicating join block %d into predecessor paths\n", "Duplicating join block %d into predecessor paths\n",
bb->index); bb->index);
basic_block pred0 = EDGE_PRED (bb, 0)->src; basic_block pred0 = EDGE_PRED (bb, 0)->src;
basic_block pred1 = EDGE_PRED (bb, 1)->src;
transform_duplicate (pred0, bb); transform_duplicate (pred0, bb);
transform_duplicate (pred1, bb);
changed = true; changed = true;
} }
} }