scc

commit 5409316c723bf2f0acb020da55474671a3bd8ea9
parent 8ccd9af2728ca27dd8717acd51319cd0c9890904
Author: Roberto E. Vargas Caballero <k0ga@shike2.com>
Date:   Wed,  4 Jan 2023 22:22:17 +0100

cc1: Update NCONST in aritmetic() with pointers

Pointer operations can generate constant expressions
too.

Diffstat:
M
src/cmd/cc/cc1/expr.c
 | 
6
+++++-

1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/src/cmd/cc/cc1/expr.c b/src/cmd/cc/cc1/expr.c
@@ -332,6 +332,7 @@ incorrect:
 static Node *
 arithmetic(int op, Node *lp, Node *rp)
 {
+	Node *np;
 	Type *ltp = lp->type, *rtp = rp->type;
 
 	if ((ltp->prop & TARITH) && (rtp->prop & TARITH)) {
@@ -345,7 +346,10 @@ arithmetic(int op, Node *lp, Node *rp)
 		case OA_SUB:
 		case OINC:
 		case ODEC:
-			return parithmetic(op, lp, rp);
+			np = parithmetic(op, lp, rp);
+			if ((lp->flags&NCONST) && (rp->flags&NCONST))
+				np->flags |= NCONST;
+			return np;
 		}
 	}
 	errorp("incorrect arithmetic operands");