cmd/5g, cmd/6g, cmd/8g: update frame zeroing for new bitmap format

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/12740046

src/cmd/5g/ggen.c

@@ -14,7 +14,7 @@ static Prog* appendp(Prog*, int, int, int, int32, int, int, int32);
 void
 defframe(Prog *ptxt, Bvec *bv)
 {
-	int i, first;
+	int i, j, first;
 	uint32 frame;
 	Prog *p, *p1;
 	
@@ -49,8 +49,8 @@ defframe(Prog *ptxt, Bvec *bv)
 		patch(p, p1);
 	} else {
 		first = 1;
-		for(i=0; i<stkptrsize; i+=widthptr) {
-			if(bvget(bv, i/widthptr)) {
+		for(i=0, j=0; i<stkptrsize; i+=widthptr, j+=2) {
+			if(bvget(bv, j) || bvget(bv, j+1)) {
 				if(first) {
 					p = appendp(p, AMOVW, D_CONST, NREG, 0, D_REG, 0, 0);
 					first = 0;

src/cmd/6g/ggen.c

@@ -14,7 +14,7 @@ static Prog* appendp(Prog*, int, int, vlong, int, vlong);
 void
 defframe(Prog *ptxt, Bvec *bv)
 {
-	int i;
+	int i, j;
 	uint32 frame;
 	Prog *p;
 
@@ -37,8 +37,8 @@ defframe(Prog *ptxt, Bvec *bv)
 		p = appendp(p, AREP, D_NONE, 0, D_NONE, 0);
 		appendp(p, ASTOSQ, D_NONE, 0, D_NONE, 0);
 	} else {
-		for(i=0; i<stkptrsize; i+=widthptr)
-			if(bvget(bv, i/widthptr))
+		for(i=0, j=0; i<stkptrsize; i+=widthptr, j+=2)
+			if(bvget(bv, j) || bvget(bv, j+1))
 				p = appendp(p, AMOVQ, D_CONST, 0, D_SP+D_INDIR, frame-stkptrsize+i);
 	}
 }

src/cmd/8g/ggen.c

@@ -16,7 +16,7 @@ defframe(Prog *ptxt, Bvec *bv)
 {
 	uint32 frame;
 	Prog *p;
-	int i;
+	int i, j;
 
 	// fill in argument size
 	ptxt->to.offset2 = rnd(curfn->type->argwid, widthptr);
@@ -39,8 +39,8 @@ defframe(Prog *ptxt, Bvec *bv)
 		p = appendp(p, AREP, D_NONE, 0, D_NONE, 0);
 		appendp(p, ASTOSL, D_NONE, 0, D_NONE, 0);
 	} else {
-		for(i=0; i<stkptrsize; i+=widthptr)
-			if(bvget(bv, i/widthptr))
+		for(i=0, j=0; i<stkptrsize; i+=widthptr, j+=2)
+			if(bvget(bv, j) || bvget(bv, j+1))
 				p = appendp(p, AMOVL, D_CONST, 0, D_SP+D_INDIR, frame-stkptrsize+i);
 	}
 }