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codeb: (opt) bei zuweisungen wie 'x := x-1' nur ein subq befehl statt movq,subq,movq
author
Bernhard Urban
<lewurm@gmail.com>
Sun, 30 May 2010 13:34:13 +0000
(15:34 +0200)
committer
Bernhard Urban
<lewurm@gmail.com>
Sun, 30 May 2010 13:34:13 +0000
(15:34 +0200)
codeb/code.bfe
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diff --git
a/codeb/code.bfe
b/codeb/code.bfe
index 791135b84e1bc82cf6e8e7f62e6a3fb6de00f1a1..8615fab3d1222133a0a14eda3fcf0f270bf71415 100644
(file)
--- a/
codeb/code.bfe
+++ b/
codeb/code.bfe
@@
-172,6
+172,16
@@
void gen_subspecial(struct treenode *bnode, short e)
printf("\taddq %%%s, %%%s\n", KIDKID_REG(1,1), BN_REG);
}
printf("\taddq %%%s, %%%s\n", KIDKID_REG(1,1), BN_REG);
}
+void assign_var(struct treenode *bnode)
+{
+ KIDREG2PARM(1);
+ if (strcmp(bnode->kids[0]->kids[0]->name, bnode->kids[1]->name) != 0) {
+ KIDKIDREG2PARM(0,0);
+ printf("\tmov %%%s, %%%s\n", KIDKID_REG(0,0), KID_REG(1));
+ } /*else: x := x - 1 geht in einem befehl */
+ printf("\tsub $%d, %%%s\n", KIDKID_VAL(0,1), KID_REG(1));
+}
+
%}
%start begin
%}
%start begin
@@
-188,6
+198,8
@@
assign: O_ASSIGN(expr, O_ID) # 1 # KIDREG2PARM(1); printf("\tmovq %%%s, %%%s\n",
assign: O_ASSIGN(imm, O_ID) # 1 # KIDREG2PARM(1); printf("\tmovq $%d, %%%s\n", KID_VAL(0), KID_REG(1));
assign: O_ASSIGN(O_ID, O_ID) # 1 # KIDREG2PARM(1); KIDREG2PARM(0); printf("\tmovq %%%s, %%%s\n", KID_REG(0), KID_REG(1));
assign: O_ASSIGN(imm, O_ID) # 1 # KIDREG2PARM(1); printf("\tmovq $%d, %%%s\n", KID_VAL(0), KID_REG(1));
assign: O_ASSIGN(O_ID, O_ID) # 1 # KIDREG2PARM(1); KIDREG2PARM(0); printf("\tmovq %%%s, %%%s\n", KID_REG(0), KID_REG(1));
+assign: O_ASSIGN(O_SUB(O_ID,O_NUM), O_ID) # 1 # assign_var(bnode);
+
assign: O_ASSIGN(expr, O_FIELD(expr)) # 1 # KIDKIDREG2PARM(1,0); printf("\tmovq %%%s, %d(%%%s)\n", BN_REG, bnode->kids[1]->soffset * 8, KIDKID_REG(1,0));
assign: O_ASSIGN(O_ID, O_FIELD(expr)) # 1 # KIDREG2PARM(0); KIDKIDREG2PARM(1,0); printf("\tmovq %%%s, %d(%%%s)\n", KID_REG(0), bnode->kids[1]->soffset * 8, KIDKID_REG(1,0));
assign: O_ASSIGN(expr, O_FIELD(expr)) # 1 # KIDKIDREG2PARM(1,0); printf("\tmovq %%%s, %d(%%%s)\n", BN_REG, bnode->kids[1]->soffset * 8, KIDKID_REG(1,0));
assign: O_ASSIGN(O_ID, O_FIELD(expr)) # 1 # KIDREG2PARM(0); KIDKIDREG2PARM(1,0); printf("\tmovq %%%s, %d(%%%s)\n", KID_REG(0), bnode->kids[1]->soffset * 8, KIDKID_REG(1,0));