From: Michael Beck <beck@ipd.info.uni-karlsruhe.de>
Date: Fri, 8 Oct 2010 21:28:23 +0000 (+0000)
Subject: Allow 64bit Leas (2 shifts and 1 add)
X-Git-Url: http://nsz.repo.hu/git/?a=commitdiff_plain;h=c6778d630500a322205f91c224b7076294f75e03;p=libfirm

Allow 64bit Leas (2 shifts and 1 add)

[r28085]
---

diff --git a/ir/be/ia32/ia32_architecture.c b/ir/be/ia32/ia32_architecture.c
index 1b0881603..0c00c8983 100644
--- a/ir/be/ia32/ia32_architecture.c
+++ b/ir/be/ia32/ia32_architecture.c
@@ -464,7 +464,8 @@ int ia32_evaluate_insn(insn_kind kind, const ir_mode *mode, ir_tarval *tv)
 		/* lea is only supported for 32 bit */
 		if (get_mode_size_bits(mode) <= 32)
 			return arch_costs->lea_cost;
-		return 0x10000;
+		/* in 64bit mode, the Lea cost are at wort 2 shifts and one add */
+		return 2 * arch_costs->add_cost + 2 * (2 * arch_costs->const_shf_cost);
 	case ADD:
 	case SUB:
 		if (get_mode_size_bits(mode) <= 32)