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re PR tree-optimization/69999 (ICE in verify_loop_structure, at cfgloop.c:1639 (error: loop with header 3 not in loop tree) at -O3 or -Ofast)

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PR tree-optimization/69999
	* gimple-ssa-split-paths.c (split_paths): When duplicating a block
	with an outgoing edge marked with EDGE_IRREDUCIBLE_LOOP, schedule
	loop cleanups.

	PR tree-optimization/69999
	* gcc.c-torture/compile/pr69999.c: New test.

From-SVN: r233824
This commit is contained in:
Jeff Law 2016-02-29 15:45:41 -07:00 • committed by Jeff Law
parent 8cfb576a28
commit 0c6072a3fc
4 changed files with 46 additions and 0 deletions
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7
gcc/ChangeLog
View file

@ -1,3 +1,10 @@
2016-02-28 Jeff Law <law@redhat.com>
PR tree-optimization/69999
* gimple-ssa-split-paths.c (split_paths): When duplicating a block
with an outgoing edge marked with EDGE_IRREDUCIBLE_LOOP, schedule
loop cleanups.
2016-02-29 Richard Biener <rguenther@suse.de>
PR tree-optimization/69994

18
gcc/gimple-ssa-split-paths.c
View file

@ -294,6 +294,24 @@ split_paths ()
basic_block pred0 = EDGE_PRED (bb, 0)->src;
transform_duplicate (pred0, bb);
changed = true;
/* If BB has an outgoing edge marked as IRREDUCIBLE, then
duplicating BB may result in an irreducible region turning
into a natural loop.
Long term we might want to hook this into the block
duplication code, but as we've seen with similar changes
for edge removal, that can be somewhat risky. */
if (EDGE_SUCC (bb, 0)->flags & EDGE_IRREDUCIBLE_LOOP
|| EDGE_SUCC (bb, 1)->flags & EDGE_IRREDUCIBLE_LOOP)
{
if (dump_file && (dump_flags & TDF_DETAILS))
fprintf (dump_file,
"Join block %d has EDGE_IRREDUCIBLE_LOOP set. "
"Scheduling loop fixups.\n",
bb->index);
loops_state_set (LOOPS_NEED_FIXUP);
}
}
}

5
gcc/testsuite/ChangeLog
View file

@ -1,3 +1,8 @@
2016-02-29 Jeff Law <law@redhat.com>
PR tree-optimization/69999
* gcc.c-torture/compile/pr69999.c: New test.
2016-02-29 Yuri Rumyantsev <ysrumyan@gmail.com>
PR tree-optimization/69652

16
gcc/testsuite/gcc.c-torture/compile/pr69999.c Normal file
View file

@ -0,0 +1,16 @@
int uh;
void
ha(void)
{
while (uh) {
for (uh = 0; uh < 1; ++uh) {
uh = 0;
if (uh != 0)
ts:
uh %= uh;
}
++uh;
}
goto ts;
}