e0429b2103
- Removed --disable-bootstrap just to make sure that a proper compiler is generated. - Adapted pkg to be part of the bootstrap process.
41 lines
1.5 KiB
Diff
41 lines
1.5 KiB
Diff
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60902
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--- gcc/tree-ssa-threadedge.c 2014/04/23 17:53:56 209715
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+++ gcc/tree-ssa-threadedge.c 2014/04/23 18:04:46 209716
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@@ -387,7 +387,34 @@
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&& (gimple_code (stmt) != GIMPLE_CALL
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|| gimple_call_lhs (stmt) == NULL_TREE
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|| TREE_CODE (gimple_call_lhs (stmt)) != SSA_NAME))
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- continue;
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+ {
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+ /* STMT might still have DEFS and we need to invalidate any known
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+ equivalences for them.
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+
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+ Consider if STMT is a GIMPLE_ASM with one or more outputs that
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+ feeds a conditional inside a loop. We might derive an equivalence
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+ due to the conditional. */
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+ tree op;
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+ ssa_op_iter iter;
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+
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+ if (backedge_seen)
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+ FOR_EACH_SSA_TREE_OPERAND (op, stmt, iter, SSA_OP_DEF)
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+ {
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+ /* This call only invalidates equivalences created by
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+ PHI nodes. This is by design to keep the cost of
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+ of invalidation reasonable. */
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+ invalidate_equivalences (op, stack, src_map, dst_map);
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+
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+ /* However, conditionals can imply values for real
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+ operands as well. And those won't be recorded in the
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+ maps. In fact, those equivalences may be recorded totally
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+ outside the threading code. We can just create a new
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+ temporary NULL equivalence here. */
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+ record_temporary_equivalence (op, NULL_TREE, stack);
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+ }
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+
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+ continue;
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+ }
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/* The result of __builtin_object_size depends on all the arguments
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of a phi node. Temporarily using only one edge produces invalid
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