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5c: fix -0x80000000 comparsion bug

--- a/sys/src/cmd/5c/txt.c

+++ b/sys/src/cmd/5c/txt.c

@@ -1056,7 +1056,7 @@

 		nextpc();

 		p->as = a;

 		naddr(f1, &p->from);

-		if(a == ACMP && f1->op == OCONST && p->from.offset < 0) {

+		if(a == ACMP && f1->op == OCONST && p->from.offset < 0 && p->from.offset != -p->from.offset) {

 			p->as = ACMN;

 			p->from.offset = -p->from.offset;

 		}

-- 

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