scc

commit 127c1b7e3029959004d49aedcf3475342bbff623
parent 90d248506ca5feff59364a53296d173d320607d3
Author: Roberto E. Vargas Caballero <k0ga@shike2.com>
Date:   Wed, 30 Mar 2022 14:00:33 +0200

cc2/qbe: Use correct return type in cast()

We don't have to do anything in qbe when we do cast that decrease
the size of a node, but we do have to update the type of the returned
node.

Diffstat:
M
src/cmd/cc/cc2/target/qbe/cgen.c
 | 
4
+++-
A
tests/cc/execute/0204-cast.c
 | 
17
+++++++++++++++++
M
tests/cc/execute/scc-tests.lst
 | 
1
+

3 files changed, 21 insertions(+), 1 deletion(-)
diff --git a/src/cmd/cc/cc2/target/qbe/cgen.c b/src/cmd/cc/cc2/target/qbe/cgen.c
@@ -222,8 +222,10 @@ cast(Type *td, Node *np)
 	s_isint = (ts->flags & INTF) != 0;
 
 	if (d_isint && s_isint) {
-		if (td->size <= ts->size)
+		if (td->size <= ts->size) {
+			np->type = *td;
 			return np;
+		}
 
 		assert(td->size == 4 || td->size == 8);
 		switch (ts->size) {
diff --git a/tests/cc/execute/0204-cast.c b/tests/cc/execute/0204-cast.c
@@ -0,0 +1,17 @@
+int
+main(void)
+{
+	static char *p = "\xe2\x80\x9c";
+	unsigned n = 0;
+
+	for (; *p; p++) {
+		n <<= 1;
+		if ((unsigned char)*p >= ' ' && (unsigned char)*p != 0x7f)
+			n |= 1;
+	}
+
+	if (n != 7)
+		return 1;
+
+	return 0;
+}
diff --git a/tests/cc/execute/scc-tests.lst b/tests/cc/execute/scc-tests.lst
@@ -194,3 +194,4 @@
 0201-cpp.c [TODO]
 0202-variadic.c [TODO]
 0203-comment.c
+0204-cast.c