codea: super mega opt auch fuer konstante

[uebersetzerbau-ss10.git] / codea / code.bfe

diff --git a/codea/code.bfe b/codea/code.bfe
index 14cde11d6ab5ce0108f0a7807a2d1c5488e69c78..84d8db4c3f0feaf58c925e29fdbb1818876aab61 100644 (file)
--- a/codea/code.bfe
+++ b/codea/code.bfe
@@ -70,8 +70,8 @@ void gen_e_imm(struct treenode *bnode, char *instr)
                        printf("\t//subtraktion mit 0 wegoptimiert\n");
                        move(KID_REG(0), BN_REG);
                } else {
-                       printf("\t%s $%d, %%%s\n", instr, KID_VAL(1), KID_REG(0));
                        move(KID_REG(0), BN_REG);
+                       printf("\t%s $%d, %%%s\n", instr, KID_VAL(1), BN_REG);
                }
        }
 }
@@ -149,6 +149,20 @@ void gen_lea(struct treenode *bnode, short e)
        }
 }
 
+void gen_subspecial(struct treenode *bnode, short e)
+{
+       /* tritt z.b. bei snafu_05.0 auf */
+       printf("\t//gen_subspecial(%i)\n", e);
+       if (!e)
+               KIDREG2ID(0);
+       KIDKIDREG2PARM(1,0);
+       if(e)
+               printf("\tsubq $%d, %%%s\n", KIDKID_VAL(1,0), BN_REG);
+       else
+               printf("\tsubq %%%s, %%%s\n", KIDKID_REG(1,0), BN_REG);
+       printf("\taddq %%%s, %%%s\n", KIDKID_REG(1,1), BN_REG);
+}
+
 %}
 
 %start begin
@@ -171,6 +185,9 @@ expr: O_SUB(expr,imm)    # 2 # gen_e_imm(bnode, "subq");
 expr: O_SUB(imm,expr)  # 2 # gen_imm_eno(bnode, "subq");
 expr: O_SUB(imm,O_FIELD(expr)) # 2 # gen_imm_field(bnode);
 
+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_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);