From: Bernhard Urban <lewurm@gmail.com>
Date: Thu, 10 Jun 2010 14:03:02 +0000 (+0200)
Subject: ppc: kleinere spielerein bezueglich stack
X-Git-Url: http://wien.tomnetworks.com/gitweb/?p=uebersetzerbau-ss10.git;a=commitdiff_plain;h=fe7933757ada120de8e4b10cbaef73f3705d2239

ppc: kleinere spielerein bezueglich stack

folgende Testfaelle gehen noch nicht:
codeb_georg_asm{a,b}*
codeb_intelli_14.0
old_abgabe_cf.0
skinner33_01.0 # vermutlich selbes problem wie bei cf, sehr komisches verhalten!
---

diff --git a/gesamt_ppc/code.bfe b/gesamt_ppc/code.bfe
index e9234f9..f97b517 100644
--- a/gesamt_ppc/code.bfe
+++ b/gesamt_ppc/code.bfe
@@ -199,14 +199,20 @@ void assign_var(struct treenode *bnode)
 	printf("\tsubi %s,%s,%d\n", KID_REG(1), KID_REG(1), KIDKID_VAL(0,1));
 }
 
+/* ... dirty */
+static short sc[8] = {0};
 void make_call(struct treenode *bnode)
 {
 	int j;
 	printf("\t#params pushen\n");
 	for(j = 0; j < bnode->soffset; j++) {
-		printf("\tlwz 20,%d(1)\n", j*4);
-		printf("\tstw %s,%d(1)\n", param_reg(j), j*4);
-		printf("\tmr %s,20\n", param_reg(j));
+		if(sc[j] == 1) {
+			printf("\tlwz 20,%d(1)\n", j*4);
+			printf("\tstw %s,%d(1)\n", param_reg(j), j*4);
+			printf("\tmr %s,20\n", param_reg(j));
+		} else if (sc[j] == 0) {
+			printf("\tstw %s,%d(1)\n", param_reg(j), j*4);
+		}
 	}
 	printf("\t#vars pushen\n");
 	for(j = bnode->soffset; j < bnode->soffset + bnode->vars; j++) {
@@ -245,14 +251,24 @@ void make_call(struct treenode *bnode)
 	}
 
 	printf("\t#params poppen\n");
+	for(j = bnode->soffset - 1; j >= 0; j--) {
+		if(sc[j] == 0)
+			printf("\tlwz %s,%d(1)\n", param_reg(j), j*4);
+	}
 	for(j = 0; j < bnode->soffset; j++) {
-		printf("\tlwz %s,%d(1)\n", param_reg(j), j*4);
+		if(sc[j] > 0)
+			printf("\tlwz %s,%d(1)\n", param_reg(j), j*4);
 	}
+
+	/* clear stack control array */
+	for(j = 0; j < sizeof sc / sizeof sc[0]; j++)
+		sc[j] = 0;
 }
 
 void prep_arg(struct treenode *bnode, int moveit)
 {
 	printf("\t#args-nr-> %i (%%%s) [moveit= %i]\n", bnode->soffset, param_reg(bnode->soffset), moveit);
+	sc[bnode->soffset] = 1;
 	if(moveit) { /* expr */
 		if((BN_REG == (char *) NULL) || (bnode->kids[1] != TREENULL && bnode->kids[1]->op == O_ID && bnode->kids[1]->kids[0] == TREENULL && bnode->kids[1]->kids[1] == TREENULL)) {
 			if(bnode->kids[1]->name != (char *) NULL && strcmp(bnode->kids[1]->name,"this")!=0) {
@@ -260,6 +276,7 @@ void prep_arg(struct treenode *bnode, int moveit)
 				printf("\tstw %s,%d(1)\n", KID_REG(1),bnode->soffset*4);
 			} else {
 				printf("\tstw %s,%d(1)\n", param_reg(bnode->soffset), bnode->soffset*4);
+				sc[bnode->soffset] = 2;
 			}
 		} else {
 			printf("\tstw %s,%d(1)\n", BN_REG, bnode->soffset*4);