From 064f2b2e0e4ceb76c69a1a231572ab78b4dd9be1 Mon Sep 17 00:00:00 2001 From: Bernhard Urban Date: Sun, 30 May 2010 15:34:13 +0200 Subject: [PATCH] codeb: (opt) bei zuweisungen wie 'x := x-1' nur ein subq befehl statt movq,subq,movq --- codeb/code.bfe | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/codeb/code.bfe b/codeb/code.bfe index 791135b..8615fab 100644 --- 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); } +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 @@ -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(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)); -- 2.25.1