X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=ir%2Fbe%2Fia32%2Fia32_common_transform.c;h=2b7d49eae3db287195e720e99aa81a8dca920c03;hb=438580abed840c55e82a03b47daeacfe2da8040f;hp=2bfbefcd1c742954ae05f10feb28e9bb684a5b10;hpb=a9950b7e54fec21e54067548ba9748a298d20e55;p=libfirm

diff --git a/ir/be/ia32/ia32_common_transform.c b/ir/be/ia32/ia32_common_transform.c
index 2bfbefcd1..2b7d49eae 100644
--- a/ir/be/ia32/ia32_common_transform.c
+++ b/ir/be/ia32/ia32_common_transform.c
@@ -511,7 +511,7 @@ ir_node *ia32_gen_ASM(ir_node *node)
 	for (out_idx = 0; out_idx < n_out_constraints; ++out_idx) {
 		const ir_asm_constraint   *constraint = &out_constraints[out_idx];
 		const char                *c       = get_id_str(constraint->constraint);
-		unsigned                   pos        = constraint->pos;
+		unsigned                   pos     = constraint->pos;
 		constraint_t               parsed_constraint;
 		const arch_register_req_t *req;
 
@@ -520,6 +520,12 @@ ir_node *ia32_gen_ASM(ir_node *node)
 		                        out_reg_reqs, out_idx);
 		out_reg_reqs[out_idx] = req;
 
+		/* multiple constraints for same pos. This can happen for example when
+		 * a =A constraint gets lowered to two constraints: =a and =d for the
+		 * same pos */
+		if (register_map[pos].valid)
+			continue;
+
 		register_map[pos].use_input = 0;
 		register_map[pos].valid     = 1;
 		register_map[pos].memory    = 0;