shithub: riscv

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8c, 6c: fix mulgen botch error for handling multiplication by zero constant

--- a/sys/src/cmd/6c/mul.c

+++ b/sys/src/cmd/6c/mul.c

@@ -312,6 +312,11 @@

 	Mparam *p;

 	Node nod, nods;

+	if(v == 0){

+		zeroregm(n);

+		return 1;

+	}

+

 	for(i = 0; i < nelem(multab); i++) {

 		p = &multab[i];

 		if(p->value == v)

--- a/sys/src/cmd/8c/mul.c

+++ b/sys/src/cmd/8c/mul.c

@@ -312,6 +312,11 @@

 	Mparam *p;

 	Node nod, nods;

+	if(v == 0){

+		zeroregm(n);

+		return 1;

+	}

+

 	for(i = 0; i < nelem(multab); i++) {

 		p = &multab[i];

 		if(p->value == v)