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Avoid if-conversion of loops in which the data dependence analysis fails.

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2010-05-26  Sebastian Pop  <sebastian.pop@amd.com>

	* tree-if-conv.c (if_convertible_loop_p): Avoid if-conversion
	of loops in which the data dependence analysis fails.

From-SVN: r159883
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Sebastian Pop 2010-05-26 16:46:25 +00:00 • committed by Sebastian Pop
parent d730961859
commit 6d7950341a
2 changed files with 19 additions and 0 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2010-05-26 Sebastian Pop <sebastian.pop@amd.com>
* tree-if-conv.c (if_convertible_loop_p): Avoid if-conversion
of loops in which the data dependence analysis fails.
2010-05-26 Sebastian Pop <sebastian.pop@amd.com>
* tree-if-conv.c (if_convertible_loop_p): Do not compute/free

14
gcc/tree-if-conv.c
View file

@ -623,6 +623,20 @@ if_convertible_loop_p (struct loop *loop)
return false;
}
/* Don't if-convert the loop when the data dependences cannot be
computed: the loop won't be vectorized in that case. */
{
VEC (data_reference_p, heap) *refs = VEC_alloc (data_reference_p, heap, 5);
VEC (ddr_p, heap) *ddrs = VEC_alloc (ddr_p, heap, 25);
bool res = compute_data_dependences_for_loop (loop, true, &refs, &ddrs);
free_data_refs (refs);
free_dependence_relations (ddrs);
if (!res)
return false;
}
calculate_dominance_info (CDI_DOMINATORS);
/* Allow statements that can be handled during if-conversion. */