Tests for correct stack alignment on x86.
authordrepper <drepper>
Wed, 22 Dec 2004 19:59:36 +0000 (19:59 +0000)
committerdrepper <drepper>
Wed, 22 Dec 2004 19:59:36 +0000 (19:59 +0000)
sysdeps/i386/tst-stack-align.h [new file with mode: 0644]

diff --git a/sysdeps/i386/tst-stack-align.h b/sysdeps/i386/tst-stack-align.h
new file mode 100644 (file)
index 0000000..6297d9f
--- /dev/null
@@ -0,0 +1,42 @@
+/* Copyright (C) 2004 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <stdio.h>
+#include <stdint.h>
+
+typedef struct { int i[4]; } int_al16 __attribute__((aligned (16)));
+
+#define TEST_STACK_ALIGN() \
+  ({                                                                        \
+    int_al16 _m;                                                            \
+    double _d = 12.0;                                                       \
+    long double _ld = 15.0;                                                 \
+    int _ret = 0;                                                           \
+    printf ("int_al16:  %p %zu\n", &_m, __alignof (int_al16));              \
+    if ((((uintptr_t) &_m) & (__alignof (int_al16) - 1)) != 0)              \
+      _ret = 1;                                                                     \
+                                                                            \
+    printf ("double:  %g %p %zu\n", _d, &_d, __alignof (double));           \
+    if ((((uintptr_t) &_d) & (__alignof (double) - 1)) != 0)                \
+      _ret = 1;                                                                     \
+                                                                            \
+    printf ("ldouble: %Lg %p %zu\n", _ld, &_ld, __alignof (long double));    \
+    if ((((uintptr_t) &_ld) & (__alignof (long double) - 1)) != 0)          \
+      _ret = 1;                                                                     \
+    _ret;                                                                   \
+    })