scc

commit 2fdc51bcc25975c04b6f40f51f87712e5a1a60d8
parent 67327320b7553450ecf3eb824b3dbec3d7dea096
Author: Roberto E. Vargas Caballero <k0ga@shike2.com>
Date:   Sat,  1 Jul 2017 18:09:18 +0200

[cc1] Rewrite null()

Null() cannot simplify because it returns a boolean value,
and it means that the parent of the current node hasn't a
way to verify thet its child i sthe same after calling null().
This new version of the patch matches the tree for (void *) 0.Z

Diffstat:
M
cc1/expr.c
 | 
9
++++++---

1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/cc1/expr.c b/cc1/expr.c
@@ -120,10 +120,13 @@ set_p1_p2:
 static int
 null(Node *np)
 {
-	if (np->op == OCAST)
-		np = simplify(np);
-	if (!(np->flags&NCONST) || np->type != pvoidtype)
+	if (np->type != pvoidtype || np->op != OCAST)
 		return 0;
+
+	np = np->left;
+	if (np->type != inttype)
+		return 0;
+
 	return cmpnode(np, 0);
 }