From: Michael Beck <beck@ipd.info.uni-karlsruhe.de>
Date: Tue, 31 Jul 2007 14:22:42 +0000 (+0000)
Subject: transform Load & 0xFF into Loadzx
X-Git-Url: http://nsz.repo.hu/git/?a=commitdiff_plain;h=aaa1f103ece7240b243d740b98f23cc81d3f8a35;p=libfirm

transform Load & 0xFF into Loadzx

[r15389]
---

diff --git a/ir/be/ia32/ia32_transform.c b/ir/be/ia32/ia32_transform.c
index e315458a6..018d09fed 100644
--- a/ir/be/ia32/ia32_transform.c
+++ b/ir/be/ia32/ia32_transform.c
@@ -873,7 +873,25 @@ static ir_node *gen_And(ir_node *node) {
 	ir_node *op1 = get_And_left(node);
 	ir_node *op2 = get_And_right(node);
 
-	assert (! mode_is_float(get_irn_mode(node)));
+	assert(! mode_is_float(get_irn_mode(node)));
+
+	if (is_Const(op2) && is_Load(skip_Proj(op1)) && get_irn_n_edges(op1) == 1) {
+		/* a Load() & Const */
+		tarval *tv = get_Const_tarval(op2);
+		long v = get_tarval_long(tv);
+
+		if (v == 0xFF) {
+			ir_node *new_op = be_transform_node(op1);
+			ir_node *load = skip_Proj(new_op);
+			set_ia32_ls_mode(load, mode_Bu);
+			return new_op;
+		} else if (v == 0xFFFF) {
+			ir_node *new_op = be_transform_node(op1);
+			ir_node *load = skip_Proj(new_op);
+			set_ia32_ls_mode(load, mode_Hu);
+			return new_op;
+		}
+	}
 	return gen_binop(node, op1, op2, new_rd_ia32_And, 1);
 }