From: Christoph Mallon <christoph.mallon@gmx.de>
Date: Wed, 12 Nov 2008 22:01:28 +0000 (+0000)
Subject: One less sign extension in an obscure case.
X-Git-Url: http://nsz.repo.hu/git/?a=commitdiff_plain;h=ded9b61cc3a43a97c7ae17e1cdabbac977ee45e7;p=libfirm

One less sign extension in an obscure case.

[r23608]
---

diff --git a/ir/be/ia32/ia32_transform.c b/ir/be/ia32/ia32_transform.c
index a029157d1..7326b16e6 100644
--- a/ir/be/ia32/ia32_transform.c
+++ b/ir/be/ia32/ia32_transform.c
@@ -3132,8 +3132,10 @@ static ir_node *gen_x87_gp_to_fp(ir_node *node, ir_mode *src_mode)
 
 	/* first convert to 32 bit signed if necessary */
 	if (get_mode_size_bits(src_mode) < 32) {
-		new_op = create_Conv_I2I(dbgi, block, noreg, noreg, nomem, new_op, src_mode);
-		SET_IA32_ORIG_NODE(new_op, node);
+		if (!upper_bits_clean(new_op, src_mode)) {
+			new_op = create_Conv_I2I(dbgi, block, noreg, noreg, nomem, new_op, src_mode);
+			SET_IA32_ORIG_NODE(new_op, node);
+		}
 		mode = mode_Is;
 	}