[llvm-commits] [test-suite] r90916 - /test-suite/trunk/SingleSource/UnitTests/2009-12-07-StructReturn.c

[Stuart Hastings]

Author: stuart
Date: Tue Dec  8 18:56:54 2009
New Revision: 90916

URL: http://llvm.org/viewvc/llvm-project?rev=90916&view=rev
Log:
Test case for r90914.

Added:
    test-suite/trunk/SingleSource/UnitTests/2009-12-07-StructReturn.c

Added: test-suite/trunk/SingleSource/UnitTests/2009-12-07-StructReturn.c
URL: http://llvm.org/viewvc/llvm-project/test-suite/trunk/SingleSource/UnitTests/2009-12-07-StructReturn.c?rev=90916&view=auto

==============================================================================
--- test-suite/trunk/SingleSource/UnitTests/2009-12-07-StructReturn.c (added)
+++ test-suite/trunk/SingleSource/UnitTests/2009-12-07-StructReturn.c Tue Dec  8 18:56:54 2009
@@ -0,0 +1,35 @@
+/* <rdar://problem/7437022> */
+/* Just enough complexity to frighten the optimizer and expose a bug
+   in an ugly one-file testcase. */
+extern int printf(const char * __restrict, ...);
+extern void abort(void);
+typedef struct {
+  float ary[3];
+} foostruct;
+typedef struct {
+  foostruct foo;
+  float safe;
+} barstruct;
+barstruct bar_ary[4];
+float * __attribute__ ((__noinline__))
+  spooky(int i) {
+  bar_ary[i].safe = 142.0;
+  return &bar_ary[i].safe;
+}
+foostruct __attribute__ ((__noinline__))
+foobify(void) {
+  static barstruct my_static_foo = { {42.0, 42.0, 42.0}, /*safe=*/42.0 };
+  return my_static_foo.foo;
+}
+int
+main(int argc, char *argv[]) {
+  float *pf = spooky(0);
+  /* This should store exactly 96 bits.  Some compilers stored 128
+     bits, clobbering beyond the end of the "foo" struct.  */
+  bar_ary[0].foo = foobify();
+  if (*pf != 142.0) {
+    printf("error: store clobbered memory outside destination\n");
+    abort();
+  }
+  return 0;
+}