shithub: scc

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Fix moveto() reuse case

When moveto detects that register already contents
the symbol we are looking for it has to return.
Is is not the same and it is not used, then it must be
spilled.

--- a/cc2/cgen.c

+++ b/cc2/cgen.c

@@ -158,9 +158,9 @@

 	if (u) {

 		Symbol *sym = np->sym;

-		if (op == u->op && sym && sym == u->sym)

+		if (sym && sym == u->sym)

 			return;

-		else

+		else if (!np->used)

 			spill(reg);

 	}

@@ -349,6 +349,7 @@

 	lp->used = 1;

 	np->op = REG;

 	np->reg = rp->reg;

+	np->sym = lp->sym;

 }

 static void