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8c: make cgen64() compile target first when it contains functoin call so final assignment wont trash the registers

--- a/sys/src/cmd/8c/cgen64.c

+++ b/sys/src/cmd/8c/cgen64.c

@@ -1575,6 +1575,13 @@

 	cmp = 0;

 	sh = 0;

+	if(nn != Z && nn->complex >= FNX){

+		reglcgen(&nod1, nn, Z);

+		m = cgen64(n, &nod1);

+		regfree(&nod1);

+		return m;

+	}

+

 	switch(n->op) {

 	case ONEG:

 		d = regpair(nn, n);