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re PR tree-optimization/51624 (Assert_Failure atree.adb:808 during stage 3) 

PR tree-optimization/51624
	* tree-sra.c (build_ref_for_model): When replicating a chain of
	COMPONENT_REFs, stop as soon as the offset would become negative.

From-SVN: r182889
This commit is contained in:
Eric Botcazou 2012-01-04 21:34:27 +00:00 committed by Eric Botcazou
parent 5dc28f42b4
commit 8594273a73
2 changed files with 14 additions and 3 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2012-01-04 Eric Botcazou <ebotcazou@adacore.com>
PR tree-optimization/51624
* tree-sra.c (build_ref_for_model): When replicating a chain of
COMPONENT_REFs, stop as soon as the offset would become negative.
2012-01-04 Jakub Jelinek <jakub@redhat.com>
PR debug/51695

11
gcc/tree-sra.c
View File

@ -1520,11 +1520,16 @@ build_ref_for_model (location_t loc, tree base, HOST_WIDE_INT offset,
do {
tree field = TREE_OPERAND (expr, 1);
tree cr_offset = component_ref_field_offset (expr);
gcc_assert (cr_offset && host_integerp (cr_offset, 1));
HOST_WIDE_INT bit_pos
= tree_low_cst (cr_offset, 1) * BITS_PER_UNIT
+ TREE_INT_CST_LOW (DECL_FIELD_BIT_OFFSET (field));
offset -= TREE_INT_CST_LOW (cr_offset) * BITS_PER_UNIT;
offset -= TREE_INT_CST_LOW (DECL_FIELD_BIT_OFFSET (field));
/* We can be called with a model different from the one associated
with BASE so we need to avoid going up the chain too far. */
if (offset - bit_pos < 0)
break;
offset -= bit_pos;
VEC_safe_push (tree, stack, cr_stack, expr);
expr = TREE_OPERAND (expr, 0);