Message ID | 20210524130647.737409-1-hjl.tools@gmail.com |
---|---|
State | New |
Headers | show |
Series | [v2] Properly check stack alignment [BZ #27901] | expand |
On 5/24/21 9:06 AM, H.J. Lu via Libc-alpha wrote: > 1. Replace > > if ((((uintptr_t) &_d) & (__alignof (double) - 1)) != 0) > > which may be optimized by compiler, with > > int > __attribute__ ((weak, noclone, noinline)) > is_aligned (void *p, int align) > { > return (((uintptr_t) p) & (align - 1)) != 0; > } OK. Skips using the ipa suggestion from Florian because that would require gcc 8 to build glibc and we only currently require gcc 6.2 in general. > > 2. Add TEST_STACK_ALIGN_INIT to TEST_STACK_ALIGN. > 3. Add a common TEST_STACK_ALIGN_INIT to check 16-byte stack alignment > for both i386 and x86-64. > 4. Update powerpc to use TEST_STACK_ALIGN_INIT. LGTM. Reviewed-by: Carlos O'Donell <carlos@redhat.com> > --- > sysdeps/generic/tst-stack-align.h | 40 ++++++++++++++++--------- > sysdeps/i386/i686/tst-stack-align.h | 44 --------------------------- > sysdeps/i386/tst-stack-align.h | 41 ------------------------- > sysdeps/powerpc/tst-stack-align.h | 27 +++++------------ > sysdeps/x86/tst-stack-align.h | 28 ++++++++++++++++++ > sysdeps/x86_64/tst-stack-align.h | 46 ----------------------------- > 6 files changed, 61 insertions(+), 165 deletions(-) > delete mode 100644 sysdeps/i386/i686/tst-stack-align.h > delete mode 100644 sysdeps/i386/tst-stack-align.h > create mode 100644 sysdeps/x86/tst-stack-align.h > delete mode 100644 sysdeps/x86_64/tst-stack-align.h > > diff --git a/sysdeps/generic/tst-stack-align.h b/sysdeps/generic/tst-stack-align.h > index b41f9d3c12..6f7c4260b5 100644 > --- a/sysdeps/generic/tst-stack-align.h > +++ b/sysdeps/generic/tst-stack-align.h > @@ -1,4 +1,5 @@ > -/* Copyright (C) 2003-2021 Free Software Foundation, Inc. > +/* Check stack alignment. Generic version. > + Copyright (C) 2003-2021 Free Software Foundation, Inc. OK. > This file is part of the GNU C Library. > > The GNU C Library is free software; you can redistribute it and/or > @@ -18,17 +19,28 @@ > #include <stdio.h> > #include <stdint.h> > > +int > +__attribute__ ((weak, noclone, noinline)) > +is_aligned (void *p, int align) > +{ > + return (((uintptr_t) p) & (align - 1)) != 0; > +} OK. Uses weak as suggested by Florian. > + > +#ifndef TEST_STACK_ALIGN_INIT > +# define TEST_STACK_ALIGN_INIT() 0 > +#endif > + > #define TEST_STACK_ALIGN() \ > - ({ \ > - double _d = 12.0; \ > - long double _ld = 15.0; \ > - int _ret = 0; \ > - 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; \ > - }) > + ({ \ > + double _d = 12.0; \ > + long double _ld = 15.0; \ > + int _ret = TEST_STACK_ALIGN_INIT (); \ > + \ > + printf ("double: %g %p %zu\n", _d, &_d, __alignof (double)); \ > + _ret += is_aligned (&_d, __alignof (double)); \ > + \ > + printf ("ldouble: %Lg %p %zu\n", _ld, &_ld, \ > + __alignof (long double)); \ > + _ret += is_aligned (&_ld, __alignof (long double)); \ > + _ret; \ > + }) OK. > diff --git a/sysdeps/i386/i686/tst-stack-align.h b/sysdeps/i386/i686/tst-stack-align.h > deleted file mode 100644 > index fc3852ea5d..0000000000 > --- a/sysdeps/i386/i686/tst-stack-align.h > +++ /dev/null > @@ -1,44 +0,0 @@ > -/* Copyright (C) 2003-2021 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, see > - <https://www.gnu.org/licenses/>. */ > - > -#include <stdio.h> > -#include <stdint.h> > -#ifndef __SSE__ > -#include_next <tst-stack-align.h> > -#else > -#include <xmmintrin.h> > - > -#define TEST_STACK_ALIGN() \ > - ({ \ > - __m128 _m; \ > - double _d = 12.0; \ > - long double _ld = 15.0; \ > - int _ret = 0; \ > - printf ("__m128: %p %zu\n", &_m, __alignof (__m128)); \ > - if ((((uintptr_t) &_m) & (__alignof (__m128) - 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; \ > - }) > -#endif OK. Remove. > diff --git a/sysdeps/i386/tst-stack-align.h b/sysdeps/i386/tst-stack-align.h > deleted file mode 100644 > index 7891e9a03e..0000000000 > --- a/sysdeps/i386/tst-stack-align.h > +++ /dev/null > @@ -1,41 +0,0 @@ > -/* Copyright (C) 2004-2021 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, see > - <https://www.gnu.org/licenses/>. */ > - > -#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; \ > - }) OK. Remove. > diff --git a/sysdeps/powerpc/tst-stack-align.h b/sysdeps/powerpc/tst-stack-align.h > index 2b4a3671b4..be055b0385 100644 > --- a/sysdeps/powerpc/tst-stack-align.h > +++ b/sysdeps/powerpc/tst-stack-align.h > @@ -1,4 +1,5 @@ > -/* Copyright (C) 2005-2021 Free Software Foundation, Inc. > +/* Check stack alignment. PowerPC version. > + Copyright (C) 2005-2021 Free Software Foundation, Inc. OK. > This file is part of the GNU C Library. > > The GNU C Library is free software; you can redistribute it and/or > @@ -15,10 +16,7 @@ > License along with the GNU C Library; if not, see > <https://www.gnu.org/licenses/>. */ > > -#include <stdio.h> > -#include <stdint.h> > - > -#define TEST_STACK_ALIGN() \ > +#define TEST_STACK_ALIGN_INIT() \ > ({ \ > /* Altivec __vector int etc. needs 16byte aligned stack. \ > Instead of using altivec.h here, use aligned attribute instead. */ \ > @@ -27,20 +25,9 @@ > int _i __attribute__((aligned (16))); \ > int _j[3]; \ > } _s = { ._i = 18, ._j[0] = 19, ._j[1] = 20, ._j[2] = 21 }; \ > - double _d = 12.0; \ > - long double _ld = 15.0; \ > - int _ret = 0; \ > printf ("__vector int: { %d, %d, %d, %d } %p %zu\n", _s._i, _s._j[0], \ > _s._j[1], _s._j[2], &_s, __alignof (_s)); \ > - if ((((uintptr_t) &_s) & (__alignof (_s) - 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; \ > - }) > + is_aligned (&_s, __alignof (_s)); \ OK. Remove generic tests and leave only the vector aligned test. > + }) > + > +#include_next <tst-stack-align.h> > diff --git a/sysdeps/x86/tst-stack-align.h b/sysdeps/x86/tst-stack-align.h > new file mode 100644 > index 0000000000..578d5c4a80 > --- /dev/null > +++ b/sysdeps/x86/tst-stack-align.h > @@ -0,0 +1,28 @@ > +/* Check stack alignment. X86 version. > + Copyright (C) 2021 Free Software Foundation, Inc. OK. > + 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, see > + <https://www.gnu.org/licenses/>. */ > + > +typedef struct { int i[16]; } int_al16 __attribute__((aligned (16))); > + > +#define TEST_STACK_ALIGN_INIT() \ > + ({ \ > + int_al16 _m; \ > + printf ("int_al16: %p %zu\n", &_m, __alignof (int_al16)); \ > + is_aligned (&_m, __alignof (int_al16)); \ > + }) OK. Check only the specific type for x86. > + > +#include_next <tst-stack-align.h> > diff --git a/sysdeps/x86_64/tst-stack-align.h b/sysdeps/x86_64/tst-stack-align.h > deleted file mode 100644 > index b3f93f7cab..0000000000 > --- a/sysdeps/x86_64/tst-stack-align.h > +++ /dev/null > @@ -1,46 +0,0 @@ > -/* Copyright (C) 2003-2021 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, see > - <https://www.gnu.org/licenses/>. */ > - > -#include <stdio.h> > -#include <stdint.h> > - > -#define TEST_STACK_ALIGN() \ > - ({ \ > - /* AMD64 ABI mandates 16byte aligned stack. \ > - Unfortunately, current GCC doesn't support __int128 or __float128 \ > - types, so use aligned attribute instead. */ \ > - struct _S \ > - { \ > - int _i __attribute__((aligned (16))); \ > - int _pad[3]; \ > - } _s = { ._i = 18 }; \ > - double _d = 12.0; \ > - long double _ld = 15.0; \ > - int _ret = 0; \ > - printf ("__int128: %d %p %zu\n", _s._i, &_s, __alignof (_s)); \ > - if ((((uintptr_t) &_s) & (__alignof (_s) - 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; \ > - }) > OK. Remove covered by generic test.
diff --git a/sysdeps/generic/tst-stack-align.h b/sysdeps/generic/tst-stack-align.h index b41f9d3c12..6f7c4260b5 100644 --- a/sysdeps/generic/tst-stack-align.h +++ b/sysdeps/generic/tst-stack-align.h @@ -1,4 +1,5 @@ -/* Copyright (C) 2003-2021 Free Software Foundation, Inc. +/* Check stack alignment. Generic version. + Copyright (C) 2003-2021 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 @@ -18,17 +19,28 @@ #include <stdio.h> #include <stdint.h> +int +__attribute__ ((weak, noclone, noinline)) +is_aligned (void *p, int align) +{ + return (((uintptr_t) p) & (align - 1)) != 0; +} + +#ifndef TEST_STACK_ALIGN_INIT +# define TEST_STACK_ALIGN_INIT() 0 +#endif + #define TEST_STACK_ALIGN() \ - ({ \ - double _d = 12.0; \ - long double _ld = 15.0; \ - int _ret = 0; \ - 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; \ - }) + ({ \ + double _d = 12.0; \ + long double _ld = 15.0; \ + int _ret = TEST_STACK_ALIGN_INIT (); \ + \ + printf ("double: %g %p %zu\n", _d, &_d, __alignof (double)); \ + _ret += is_aligned (&_d, __alignof (double)); \ + \ + printf ("ldouble: %Lg %p %zu\n", _ld, &_ld, \ + __alignof (long double)); \ + _ret += is_aligned (&_ld, __alignof (long double)); \ + _ret; \ + }) diff --git a/sysdeps/i386/i686/tst-stack-align.h b/sysdeps/i386/i686/tst-stack-align.h deleted file mode 100644 index fc3852ea5d..0000000000 --- a/sysdeps/i386/i686/tst-stack-align.h +++ /dev/null @@ -1,44 +0,0 @@ -/* Copyright (C) 2003-2021 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, see - <https://www.gnu.org/licenses/>. */ - -#include <stdio.h> -#include <stdint.h> -#ifndef __SSE__ -#include_next <tst-stack-align.h> -#else -#include <xmmintrin.h> - -#define TEST_STACK_ALIGN() \ - ({ \ - __m128 _m; \ - double _d = 12.0; \ - long double _ld = 15.0; \ - int _ret = 0; \ - printf ("__m128: %p %zu\n", &_m, __alignof (__m128)); \ - if ((((uintptr_t) &_m) & (__alignof (__m128) - 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; \ - }) -#endif diff --git a/sysdeps/i386/tst-stack-align.h b/sysdeps/i386/tst-stack-align.h deleted file mode 100644 index 7891e9a03e..0000000000 --- a/sysdeps/i386/tst-stack-align.h +++ /dev/null @@ -1,41 +0,0 @@ -/* Copyright (C) 2004-2021 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, see - <https://www.gnu.org/licenses/>. */ - -#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; \ - }) diff --git a/sysdeps/powerpc/tst-stack-align.h b/sysdeps/powerpc/tst-stack-align.h index 2b4a3671b4..be055b0385 100644 --- a/sysdeps/powerpc/tst-stack-align.h +++ b/sysdeps/powerpc/tst-stack-align.h @@ -1,4 +1,5 @@ -/* Copyright (C) 2005-2021 Free Software Foundation, Inc. +/* Check stack alignment. PowerPC version. + Copyright (C) 2005-2021 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 @@ -15,10 +16,7 @@ License along with the GNU C Library; if not, see <https://www.gnu.org/licenses/>. */ -#include <stdio.h> -#include <stdint.h> - -#define TEST_STACK_ALIGN() \ +#define TEST_STACK_ALIGN_INIT() \ ({ \ /* Altivec __vector int etc. needs 16byte aligned stack. \ Instead of using altivec.h here, use aligned attribute instead. */ \ @@ -27,20 +25,9 @@ int _i __attribute__((aligned (16))); \ int _j[3]; \ } _s = { ._i = 18, ._j[0] = 19, ._j[1] = 20, ._j[2] = 21 }; \ - double _d = 12.0; \ - long double _ld = 15.0; \ - int _ret = 0; \ printf ("__vector int: { %d, %d, %d, %d } %p %zu\n", _s._i, _s._j[0], \ _s._j[1], _s._j[2], &_s, __alignof (_s)); \ - if ((((uintptr_t) &_s) & (__alignof (_s) - 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; \ - }) + is_aligned (&_s, __alignof (_s)); \ + }) + +#include_next <tst-stack-align.h> diff --git a/sysdeps/x86/tst-stack-align.h b/sysdeps/x86/tst-stack-align.h new file mode 100644 index 0000000000..578d5c4a80 --- /dev/null +++ b/sysdeps/x86/tst-stack-align.h @@ -0,0 +1,28 @@ +/* Check stack alignment. X86 version. + Copyright (C) 2021 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, see + <https://www.gnu.org/licenses/>. */ + +typedef struct { int i[16]; } int_al16 __attribute__((aligned (16))); + +#define TEST_STACK_ALIGN_INIT() \ + ({ \ + int_al16 _m; \ + printf ("int_al16: %p %zu\n", &_m, __alignof (int_al16)); \ + is_aligned (&_m, __alignof (int_al16)); \ + }) + +#include_next <tst-stack-align.h> diff --git a/sysdeps/x86_64/tst-stack-align.h b/sysdeps/x86_64/tst-stack-align.h deleted file mode 100644 index b3f93f7cab..0000000000 --- a/sysdeps/x86_64/tst-stack-align.h +++ /dev/null @@ -1,46 +0,0 @@ -/* Copyright (C) 2003-2021 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, see - <https://www.gnu.org/licenses/>. */ - -#include <stdio.h> -#include <stdint.h> - -#define TEST_STACK_ALIGN() \ - ({ \ - /* AMD64 ABI mandates 16byte aligned stack. \ - Unfortunately, current GCC doesn't support __int128 or __float128 \ - types, so use aligned attribute instead. */ \ - struct _S \ - { \ - int _i __attribute__((aligned (16))); \ - int _pad[3]; \ - } _s = { ._i = 18 }; \ - double _d = 12.0; \ - long double _ld = 15.0; \ - int _ret = 0; \ - printf ("__int128: %d %p %zu\n", _s._i, &_s, __alignof (_s)); \ - if ((((uintptr_t) &_s) & (__alignof (_s) - 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; \ - })