From: Michael Beck <beck@ipd.info.uni-karlsruhe.de>
Date: Fri, 27 Jun 2008 16:06:43 +0000 (+0000)
Subject: do a correct rounding when calculating 70%, or small cases did not get optimized... 
X-Git-Url: http://nsz.repo.hu/git/?a=commitdiff_plain;h=e5beeab8b7b91878088417de02683bf15cba1c59;p=libfirm

do a correct rounding when calculating 70%, or small cases did not get optimized well

[r20279]
---

diff --git a/ir/ir/irarch.c b/ir/ir/irarch.c
index 351368770..5f9fdfe96 100644
--- a/ir/ir/irarch.c
+++ b/ir/ir/irarch.c
@@ -545,7 +545,7 @@ static ir_node *do_decomposition(ir_node *irn, ir_node *operand, tarval *tv) {
 	inst = decompose_mul(&env, R, r, tv);
 
 	/* the paper suggests 70% here */
-	mul_costs = (env.evaluate(MUL, tv) * 7) / 10;
+	mul_costs = (env.evaluate(MUL, tv) * 7 + 5) / 10;
 	if (evaluate_insn(&env, inst) <= mul_costs && !env.fail) {
 		env.op       = operand;
 		env.blk      = get_nodes_block(irn);