From: Bernhard Urban <lewurm@gmail.com>
Date: Tue, 18 May 2010 15:24:21 +0000 (+0200)
Subject: codea: weitere optimierung fuer sub/add
X-Git-Url: http://wien.tomnetworks.com/gitweb/?p=uebersetzerbau-ss10.git;a=commitdiff_plain;h=9b6caa07337c258e239c81f6aa859c8bcf3e243c

codea: weitere optimierung fuer sub/add
---

diff --git a/codea/code.bfe b/codea/code.bfe
index e88f2eb..654d669 100644
--- a/codea/code.bfe
+++ b/codea/code.bfe
@@ -39,6 +39,14 @@ void gen_e_eno(struct treenode *bnode, char *instr)
 	printf("\t%s %%%s, %%%s\n", instr, KID_REG(1), KID_REG(0));
 }
 
+void gen_id_eno(struct treenode *bnode)
+{
+	printf("\t//gen_id_eno\n");
+	KIDKIDREG2PARM(1,0);
+	printf("\taddq %%%s, %%%s\n", KIDKID_REG(1,0), KIDKID_REG(1,1));
+	printf("\tsubq %%%s, %%%s\n", KIDKID_REG(1,1), BN_REG);
+}
+
 void gen_e_field(struct treenode *bnode, char *instr)
 {
 	printf("\t//gen_e_field(%s)\n", instr);
@@ -193,6 +201,8 @@ expr: O_SUB(expr,imm)           # 1 # gen_e_imm(bnode, "subq");
 expr: O_SUB(expr,O_SUB(O_ID,expr)) # 2 # gen_subspecial(bnode, 0);
 expr: O_SUB(expr,O_SUB(imm,expr))  # 2 # gen_subspecial(bnode, 1);
 
+expr: O_SUB(expr, O_ADD(O_ID,expr))    # 1 # gen_id_eno(bnode);
+
 expr: O_SUB(expr,O_MUL(O_MONE,expr))   # 1 # gen_lea(bnode,0);
 expr: O_SUB(expr,O_MUL(O_MTWO,expr))   # 1 # gen_lea(bnode,0);
 expr: O_SUB(expr,O_MUL(O_MFOUR,expr))  # 1 # gen_lea(bnode,0);