scc

commit a8dae969ea1800fd5f3f247cc3cc7c91f10be260
parent c33ee56f6924c8e0f4a06fd7c1d7e0b457660781
Author: Roberto E. Vargas Caballero <k0ga@shike2.net>
Date:   Tue, 24 Mar 2026 09:30:36 +0100

cc1: Move power2node() out of modulo reduction

As new reductions are going to be added and they are going to be based
in the logarithm of the power of 2 it makes sense to have only one call
to power2node().

Diffstat:
M
src/cmd/scc-cc/cc1/fold.c
 | 
13
++++++-------

1 file changed, 6 insertions(+), 7 deletions(-)
diff --git a/src/cmd/scc-cc/cc1/fold.c b/src/cmd/scc-cc/cc1/fold.c
@@ -795,20 +795,19 @@ reduce(Node *np)
 {
 	Node *lp = np->left, *rp = np->right;
 	Node *aux, *aux2;
-	int op = np->op;
+	int log, op = np->op;
 
 	if (np->type->prop & TSIGNED)
 		return;
+	if (!power2node(rp, &log))
+		return;
 
 	switch (op) {
 	case OMOD:
 		/* i % 2^n => i & n-1 */
-		if (power2node(rp, NULL)) {
-			np->op = OBAND;
-			rp->sym->u.u--;
-			break;
-		}
-		return;
+		np->op = OBAND;
+		rp->sym->u.u--;
+		break;
 	default:
 		return;
 	}