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7c: add from3 support (no functional change)

--- a/sys/src/cmd/7c/gc.h

+++ b/sys/src/cmd/7c/gc.h

@@ -46,6 +46,7 @@

 struct	Prog

 {

 	Adr	from;

+	Adr	from3;

 	Adr	to;

 	Prog*	link;

 	long	lineno;

--- a/sys/src/cmd/7c/list.c

+++ b/sys/src/cmd/7c/list.c

@@ -60,6 +60,8 @@

 			s = seprint(s, e, ",R%d", p->reg);

 		else

 			s = seprint(s, e, ",F%d", p->reg);

+	if(p->from3.type != D_NONE)

+		s = seprint(s, e, ",%D", &p->from3);

 	if(p->to.type != D_NONE)

 		s = seprint(s, e, s[-1] == '\t' ? "%D" : ",%D", &p->to);

 	if(s[-1] == '\t')

--- a/sys/src/cmd/7c/peep.c

+++ b/sys/src/cmd/7c/peep.c

@@ -545,6 +545,7 @@

 	p->as = ANOP;

 	p->scond = zprog.scond;

 	p->from = zprog.from;

+	p->from3 = zprog.from3;

 	p->to = zprog.to;

 	p->reg = zprog.reg; /**/

 }

--- a/sys/src/cmd/7c/swt.c

+++ b/sys/src/cmd/7c/swt.c

@@ -309,6 +309,8 @@

 	bf[0] = p->as;

 	bf[1] = p->as>>8;

 	bf[2] = p->reg;

+	if(p->from3.type != D_NONE)

+		bf[2] |= 0x40;

 	l = p->lineno;

 	bf[3] = l;

 	bf[4] = l>>8;

@@ -315,6 +317,8 @@

 	bf[5] = l>>16;

 	bf[6] = l>>24;

 	bp = zaddr(bf+7, &p->from, sf);

+	if(bf[2] & 0x40)

+		bp = zaddr(bp, &p->from3, 0);

 	bp = zaddr(bp, &p->to, st);

 	Bwrite(b, bf, bp-bf);

 }

--- a/sys/src/cmd/7c/txt.c

+++ b/sys/src/cmd/7c/txt.c

@@ -40,6 +40,7 @@

 	zprog.from.type = D_NONE;

 	zprog.from.name = D_NONE;

 	zprog.from.reg = NREG;

+	zprog.from3 = zprog.from;

 	zprog.to = zprog.from;

 	regnode.op = OREGISTER;