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authorupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
committerupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
commit554fd8c5195424bdbcabf5de30fdc183aba391bd (patch)
tree976dc5ab7fddf506dadce60ae936f43f58787092 /gcc/testsuite/gcc.dg/20100906-1.c
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Diffstat (limited to 'gcc/testsuite/gcc.dg/20100906-1.c')
-rw-r--r--gcc/testsuite/gcc.dg/20100906-1.c48
1 files changed, 48 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/20100906-1.c b/gcc/testsuite/gcc.dg/20100906-1.c
new file mode 100644
index 000000000..a6541e3ff
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/20100906-1.c
@@ -0,0 +1,48 @@
+/* { dg-do run } */
+/* { dg-options "-O2" } */
+
+/* This testcase got misoptimized by combine due to a wrong setting of
+ subst_low_luid in try_combine. */
+
+enum rtx_code {
+ A, B
+};
+
+void abort (void);
+
+struct rtx_def {
+ __extension__ enum rtx_code code:16;
+};
+typedef struct rtx_def *rtx;
+
+void __attribute__((noinline))
+add_constraint (unsigned char is_a)
+{
+ if (is_a)
+ abort ();
+}
+
+void __attribute__((noinline))
+foo (rtx defn)
+{
+ switch (defn->code)
+ {
+ case A:
+ case B:
+ add_constraint (defn->code == A);
+ break;
+ default:
+ break;
+ }
+}
+
+int
+main ()
+{
+ struct rtx_def r;
+
+ r.code = B;
+
+ foo (&r);
+ return 0;
+}