pr11864-1-test.patch

来自「linux下编译交叉工具链的工具源码」· PATCH 代码 · 共 46 行

--- /dev/null	Sat Dec 14 13:56:51 2002
+++ gcc-3.3.1/gcc/testsuite/gcc.dg/pr11864-1.c	Sun Sep 14 14:32:24 2003
@@ -0,0 +1,42 @@
+/* PR optimization/11864
+ * Reporter: Kazumoto Kojima <[e-mail]>
+ * Summary: [3.3/3.4 regression] miscompiles zero extension and test
+ * Description:
+ * gcc-3.3/3.4 -O2 for sh target may miscompile the combination of zero extension
+ * and test if it's zero.
+ *
+ * Testcase tweaked by [e-mail].  Not marked as xfail because it's a regression.
+ */
+/* { dg-do run } */
+/* { dg-options "-O2" } */
+
+extern void abort(void);
+
+int val = 0xff00;
+
+int f(void)
+{
+	return val;
+}
+
+unsigned char a[1];
+
+void foo(void)
+{
+	a[0] = f() & 255;
+
+	if (!a[0])
+		a[0] = f() & 255;
+
+	if (!a[0])
+		a[0] = 1 + (f() & 127);
+}
+
+int main(int argc, char **argv)
+{
+	foo();
+	if (!a[0])
+		abort();
+
+	return 0;
+}