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6cf72879e9
With optimizations enabled at least one compiler, clang 3.7, optimized away the crc intrinsics knowing that the result went on unused and has no side effects. That can trigger errors in code generation when the intrinsic is used, as we chose to use the intrinsics without any additional compiler flag. Return the computed value to prevent that. With some more pedantic warning flags (-Wold-style-definition) the configure test failed to recognize the existence of _mm_crc32_u* intrinsics due to an independent warning in the test because the test turned on -Werror, but that's not actually needed here. Discussion: 20150814092039.GH4955@awork2.anarazel.de Backpatch: 9.5, where the use of crc intrinsics was integrated.
474 lines
17 KiB
Plaintext
474 lines
17 KiB
Plaintext
# Macros to detect C compiler features
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# config/c-compiler.m4
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# PGAC_C_SIGNED
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# -------------
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# Check if the C compiler understands signed types.
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AC_DEFUN([PGAC_C_SIGNED],
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[AC_CACHE_CHECK(for signed types, pgac_cv_c_signed,
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[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],
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[signed char c; signed short s; signed int i;])],
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[pgac_cv_c_signed=yes],
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[pgac_cv_c_signed=no])])
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if test x"$pgac_cv_c_signed" = xno ; then
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AC_DEFINE(signed,, [Define to empty if the C compiler does not understand signed types.])
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fi])# PGAC_C_SIGNED
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# PGAC_C_PRINTF_ARCHETYPE
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# -----------------------
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# Set the format archetype used by gcc to check printf type functions. We
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# prefer "gnu_printf", which includes what glibc uses, such as %m for error
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# strings and %lld for 64 bit long longs. GCC 4.4 introduced it. It makes a
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# dramatic difference on Windows.
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AC_DEFUN([PGAC_PRINTF_ARCHETYPE],
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[AC_CACHE_CHECK([for printf format archetype], pgac_cv_printf_archetype,
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[ac_save_c_werror_flag=$ac_c_werror_flag
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ac_c_werror_flag=yes
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
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[extern int
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pgac_write(int ignore, const char *fmt,...)
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__attribute__((format(gnu_printf, 2, 3)));], [])],
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[pgac_cv_printf_archetype=gnu_printf],
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[pgac_cv_printf_archetype=printf])
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ac_c_werror_flag=$ac_save_c_werror_flag])
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AC_DEFINE_UNQUOTED([PG_PRINTF_ATTRIBUTE], [$pgac_cv_printf_archetype],
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[Define to gnu_printf if compiler supports it, else printf.])
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])# PGAC_PRINTF_ARCHETYPE
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# PGAC_TYPE_64BIT_INT(TYPE)
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# -------------------------
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# Check if TYPE is a working 64 bit integer type. Set HAVE_TYPE_64 to
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# yes or no respectively, and define HAVE_TYPE_64 if yes.
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AC_DEFUN([PGAC_TYPE_64BIT_INT],
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[define([Ac_define], [translit([have_$1_64], [a-z *], [A-Z_P])])dnl
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define([Ac_cachevar], [translit([pgac_cv_type_$1_64], [ *], [_p])])dnl
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AC_CACHE_CHECK([whether $1 is 64 bits], [Ac_cachevar],
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[AC_RUN_IFELSE([AC_LANG_SOURCE(
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[typedef $1 ac_int64;
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/*
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* These are globals to discourage the compiler from folding all the
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* arithmetic tests down to compile-time constants.
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*/
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ac_int64 a = 20000001;
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ac_int64 b = 40000005;
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int does_int64_work()
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{
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ac_int64 c,d;
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if (sizeof(ac_int64) != 8)
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return 0; /* definitely not the right size */
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/* Do perfunctory checks to see if 64-bit arithmetic seems to work */
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c = a * b;
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d = (c + b) / b;
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if (d != a+1)
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return 0;
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return 1;
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}
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main() {
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exit(! does_int64_work());
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}])],
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[Ac_cachevar=yes],
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[Ac_cachevar=no],
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[# If cross-compiling, check the size reported by the compiler and
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# trust that the arithmetic works.
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AC_COMPILE_IFELSE([AC_LANG_BOOL_COMPILE_TRY([], [sizeof($1) == 8])],
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Ac_cachevar=yes,
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Ac_cachevar=no)])])
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Ac_define=$Ac_cachevar
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if test x"$Ac_cachevar" = xyes ; then
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AC_DEFINE(Ac_define, 1, [Define to 1 if `]$1[' works and is 64 bits.])
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fi
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undefine([Ac_define])dnl
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undefine([Ac_cachevar])dnl
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])# PGAC_TYPE_64BIT_INT
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# PGAC_TYPE_128BIT_INT
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# ---------------------
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# Check if __int128 is a working 128 bit integer type, and if so
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# define PG_INT128_TYPE to that typename. This currently only detects
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# a GCC/clang extension, but support for different environments may be
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# added in the future.
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#
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# For the moment we only test for support for 128bit math; support for
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# 128bit literals and snprintf is not required.
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AC_DEFUN([PGAC_TYPE_128BIT_INT],
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[AC_CACHE_CHECK([for __int128], [pgac_cv__128bit_int],
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[AC_LINK_IFELSE([AC_LANG_PROGRAM([
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/*
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* These are globals to discourage the compiler from folding all the
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* arithmetic tests down to compile-time constants. We do not have
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* convenient support for 64bit literals at this point...
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*/
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__int128 a = 48828125;
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__int128 b = 97656255;
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],[
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__int128 c,d;
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a = (a << 12) + 1; /* 200000000001 */
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b = (b << 12) + 5; /* 400000000005 */
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/* use the most relevant arithmetic ops */
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c = a * b;
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d = (c + b) / b;
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/* return different values, to prevent optimizations */
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if (d != a+1)
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return 0;
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return 1;
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])],
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[pgac_cv__128bit_int=yes],
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[pgac_cv__128bit_int=no])])
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if test x"$pgac_cv__128bit_int" = xyes ; then
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AC_DEFINE(PG_INT128_TYPE, __int128, [Define to the name of a signed 128-bit integer type.])
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fi])# PGAC_TYPE_128BIT_INT
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# PGAC_C_FUNCNAME_SUPPORT
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# -----------------------
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# Check if the C compiler understands __func__ (C99) or __FUNCTION__ (gcc).
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# Define HAVE_FUNCNAME__FUNC or HAVE_FUNCNAME__FUNCTION accordingly.
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AC_DEFUN([PGAC_C_FUNCNAME_SUPPORT],
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[AC_CACHE_CHECK(for __func__, pgac_cv_funcname_func_support,
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[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <stdio.h>],
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[printf("%s\n", __func__);])],
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[pgac_cv_funcname_func_support=yes],
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[pgac_cv_funcname_func_support=no])])
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if test x"$pgac_cv_funcname_func_support" = xyes ; then
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AC_DEFINE(HAVE_FUNCNAME__FUNC, 1,
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[Define to 1 if your compiler understands __func__.])
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else
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AC_CACHE_CHECK(for __FUNCTION__, pgac_cv_funcname_function_support,
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[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <stdio.h>],
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[printf("%s\n", __FUNCTION__);])],
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[pgac_cv_funcname_function_support=yes],
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[pgac_cv_funcname_function_support=no])])
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if test x"$pgac_cv_funcname_function_support" = xyes ; then
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AC_DEFINE(HAVE_FUNCNAME__FUNCTION, 1,
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[Define to 1 if your compiler understands __FUNCTION__.])
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fi
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fi])# PGAC_C_FUNCNAME_SUPPORT
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# PGAC_C_STATIC_ASSERT
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# --------------------
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# Check if the C compiler understands _Static_assert(),
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# and define HAVE__STATIC_ASSERT if so.
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#
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# We actually check the syntax ({ _Static_assert(...) }), because we need
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# gcc-style compound expressions to be able to wrap the thing into macros.
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AC_DEFUN([PGAC_C_STATIC_ASSERT],
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[AC_CACHE_CHECK(for _Static_assert, pgac_cv__static_assert,
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[AC_LINK_IFELSE([AC_LANG_PROGRAM([],
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[({ _Static_assert(1, "foo"); })])],
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[pgac_cv__static_assert=yes],
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[pgac_cv__static_assert=no])])
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if test x"$pgac_cv__static_assert" = xyes ; then
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AC_DEFINE(HAVE__STATIC_ASSERT, 1,
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[Define to 1 if your compiler understands _Static_assert.])
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fi])# PGAC_C_STATIC_ASSERT
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# PGAC_C_TYPES_COMPATIBLE
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# -----------------------
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# Check if the C compiler understands __builtin_types_compatible_p,
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# and define HAVE__BUILTIN_TYPES_COMPATIBLE_P if so.
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#
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# We check usage with __typeof__, though it's unlikely any compiler would
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# have the former and not the latter.
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AC_DEFUN([PGAC_C_TYPES_COMPATIBLE],
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[AC_CACHE_CHECK(for __builtin_types_compatible_p, pgac_cv__types_compatible,
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[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],
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[[ int x; static int y[__builtin_types_compatible_p(__typeof__(x), int)]; ]])],
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[pgac_cv__types_compatible=yes],
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[pgac_cv__types_compatible=no])])
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if test x"$pgac_cv__types_compatible" = xyes ; then
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AC_DEFINE(HAVE__BUILTIN_TYPES_COMPATIBLE_P, 1,
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[Define to 1 if your compiler understands __builtin_types_compatible_p.])
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fi])# PGAC_C_TYPES_COMPATIBLE
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# PGAC_C_BUILTIN_BSWAP32
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# -------------------------
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# Check if the C compiler understands __builtin_bswap32(),
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# and define HAVE__BUILTIN_BSWAP32 if so.
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AC_DEFUN([PGAC_C_BUILTIN_BSWAP32],
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[AC_CACHE_CHECK(for __builtin_bswap32, pgac_cv__builtin_bswap32,
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[AC_COMPILE_IFELSE([AC_LANG_SOURCE(
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[static unsigned long int x = __builtin_bswap32(0xaabbccdd);]
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)],
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[pgac_cv__builtin_bswap32=yes],
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[pgac_cv__builtin_bswap32=no])])
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if test x"$pgac_cv__builtin_bswap32" = xyes ; then
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AC_DEFINE(HAVE__BUILTIN_BSWAP32, 1,
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[Define to 1 if your compiler understands __builtin_bswap32.])
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fi])# PGAC_C_BUILTIN_BSWAP32
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# PGAC_C_BUILTIN_CONSTANT_P
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# -------------------------
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# Check if the C compiler understands __builtin_constant_p(),
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# and define HAVE__BUILTIN_CONSTANT_P if so.
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AC_DEFUN([PGAC_C_BUILTIN_CONSTANT_P],
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[AC_CACHE_CHECK(for __builtin_constant_p, pgac_cv__builtin_constant_p,
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[AC_COMPILE_IFELSE([AC_LANG_SOURCE(
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[[static int x; static int y[__builtin_constant_p(x) ? x : 1];]]
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)],
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[pgac_cv__builtin_constant_p=yes],
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[pgac_cv__builtin_constant_p=no])])
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if test x"$pgac_cv__builtin_constant_p" = xyes ; then
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AC_DEFINE(HAVE__BUILTIN_CONSTANT_P, 1,
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[Define to 1 if your compiler understands __builtin_constant_p.])
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fi])# PGAC_C_BUILTIN_CONSTANT_P
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# PGAC_C_BUILTIN_UNREACHABLE
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# --------------------------
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# Check if the C compiler understands __builtin_unreachable(),
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# and define HAVE__BUILTIN_UNREACHABLE if so.
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#
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# NB: Don't get the idea of putting a for(;;); or such before the
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# __builtin_unreachable() call. Some compilers would remove it before linking
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# and only a warning instead of an error would be produced.
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AC_DEFUN([PGAC_C_BUILTIN_UNREACHABLE],
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[AC_CACHE_CHECK(for __builtin_unreachable, pgac_cv__builtin_unreachable,
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[AC_LINK_IFELSE([AC_LANG_PROGRAM([],
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[__builtin_unreachable();])],
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[pgac_cv__builtin_unreachable=yes],
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[pgac_cv__builtin_unreachable=no])])
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if test x"$pgac_cv__builtin_unreachable" = xyes ; then
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AC_DEFINE(HAVE__BUILTIN_UNREACHABLE, 1,
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[Define to 1 if your compiler understands __builtin_unreachable.])
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fi])# PGAC_C_BUILTIN_UNREACHABLE
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# PGAC_C_VA_ARGS
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# --------------
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# Check if the C compiler understands C99-style variadic macros,
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# and define HAVE__VA_ARGS if so.
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AC_DEFUN([PGAC_C_VA_ARGS],
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[AC_CACHE_CHECK(for __VA_ARGS__, pgac_cv__va_args,
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[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#include <stdio.h>],
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[#define debug(...) fprintf(stderr, __VA_ARGS__)
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debug("%s", "blarg");
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])],
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[pgac_cv__va_args=yes],
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[pgac_cv__va_args=no])])
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if test x"$pgac_cv__va_args" = xyes ; then
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AC_DEFINE(HAVE__VA_ARGS, 1,
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[Define to 1 if your compiler understands __VA_ARGS__ in macros.])
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fi])# PGAC_C_VA_ARGS
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# PGAC_PROG_CC_CFLAGS_OPT
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# -----------------------
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# Given a string, check if the compiler supports the string as a
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# command-line option. If it does, add the string to CFLAGS.
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AC_DEFUN([PGAC_PROG_CC_CFLAGS_OPT],
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[define([Ac_cachevar], [AS_TR_SH([pgac_cv_prog_cc_cflags_$1])])dnl
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AC_CACHE_CHECK([whether $CC supports $1], [Ac_cachevar],
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[pgac_save_CFLAGS=$CFLAGS
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CFLAGS="$pgac_save_CFLAGS $1"
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ac_save_c_werror_flag=$ac_c_werror_flag
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ac_c_werror_flag=yes
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_AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
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[Ac_cachevar=yes],
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[Ac_cachevar=no])
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ac_c_werror_flag=$ac_save_c_werror_flag
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CFLAGS="$pgac_save_CFLAGS"])
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if test x"$Ac_cachevar" = x"yes"; then
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CFLAGS="$CFLAGS $1"
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fi
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undefine([Ac_cachevar])dnl
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])# PGAC_PROG_CC_CFLAGS_OPT
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# PGAC_PROG_CC_VAR_OPT
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# -----------------------
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# Given a variable name and a string, check if the compiler supports
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# the string as a command-line option. If it does, add the string to
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# the given variable.
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AC_DEFUN([PGAC_PROG_CC_VAR_OPT],
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[define([Ac_cachevar], [AS_TR_SH([pgac_cv_prog_cc_cflags_$2])])dnl
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AC_CACHE_CHECK([whether $CC supports $2], [Ac_cachevar],
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[pgac_save_CFLAGS=$CFLAGS
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CFLAGS="$pgac_save_CFLAGS $2"
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ac_save_c_werror_flag=$ac_c_werror_flag
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ac_c_werror_flag=yes
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_AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
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[Ac_cachevar=yes],
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[Ac_cachevar=no])
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ac_c_werror_flag=$ac_save_c_werror_flag
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CFLAGS="$pgac_save_CFLAGS"])
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if test x"$Ac_cachevar" = x"yes"; then
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$1="${$1} $2"
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fi
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undefine([Ac_cachevar])dnl
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])# PGAC_PROG_CC_CFLAGS_OPT
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# PGAC_PROG_CC_LDFLAGS_OPT
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# ------------------------
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# Given a string, check if the compiler supports the string as a
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# command-line option. If it does, add the string to LDFLAGS.
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# For reasons you'd really rather not know about, this checks whether
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# you can link to a particular function, not just whether you can link.
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# In fact, we must actually check that the resulting program runs :-(
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AC_DEFUN([PGAC_PROG_CC_LDFLAGS_OPT],
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[define([Ac_cachevar], [AS_TR_SH([pgac_cv_prog_cc_ldflags_$1])])dnl
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AC_CACHE_CHECK([whether $CC supports $1], [Ac_cachevar],
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[pgac_save_LDFLAGS=$LDFLAGS
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LDFLAGS="$pgac_save_LDFLAGS $1"
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AC_RUN_IFELSE([AC_LANG_PROGRAM([extern void $2 (); void (*fptr) () = $2;],[])],
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[Ac_cachevar=yes],
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[Ac_cachevar=no],
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[Ac_cachevar="assuming no"])
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LDFLAGS="$pgac_save_LDFLAGS"])
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if test x"$Ac_cachevar" = x"yes"; then
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LDFLAGS="$LDFLAGS $1"
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fi
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undefine([Ac_cachevar])dnl
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])# PGAC_PROG_CC_LDFLAGS_OPT
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# PGAC_HAVE_GCC__SYNC_CHAR_TAS
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# -------------------------
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# Check if the C compiler understands __sync_lock_test_and_set(char),
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# and define HAVE_GCC__SYNC_CHAR_TAS
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#
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# NB: There are platforms where test_and_set is available but compare_and_swap
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# is not, so test this separately.
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# NB: Some platforms only do 32bit tas, others only do 8bit tas. Test both.
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AC_DEFUN([PGAC_HAVE_GCC__SYNC_CHAR_TAS],
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[AC_CACHE_CHECK(for builtin __sync char locking functions, pgac_cv_gcc_sync_char_tas,
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[AC_LINK_IFELSE([AC_LANG_PROGRAM([],
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[char lock = 0;
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__sync_lock_test_and_set(&lock, 1);
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__sync_lock_release(&lock);])],
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[pgac_cv_gcc_sync_char_tas="yes"],
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[pgac_cv_gcc_sync_char_tas="no"])])
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if test x"$pgac_cv_gcc_sync_char_tas" = x"yes"; then
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AC_DEFINE(HAVE_GCC__SYNC_CHAR_TAS, 1, [Define to 1 if you have __sync_lock_test_and_set(char *) and friends.])
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fi])# PGAC_HAVE_GCC__SYNC_CHAR_TAS
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# PGAC_HAVE_GCC__SYNC_INT32_TAS
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# -------------------------
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# Check if the C compiler understands __sync_lock_test_and_set(),
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# and define HAVE_GCC__SYNC_INT32_TAS
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AC_DEFUN([PGAC_HAVE_GCC__SYNC_INT32_TAS],
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[AC_CACHE_CHECK(for builtin __sync int32 locking functions, pgac_cv_gcc_sync_int32_tas,
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[AC_LINK_IFELSE([AC_LANG_PROGRAM([],
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[int lock = 0;
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__sync_lock_test_and_set(&lock, 1);
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__sync_lock_release(&lock);])],
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[pgac_cv_gcc_sync_int32_tas="yes"],
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[pgac_cv_gcc_sync_int32_tas="no"])])
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if test x"$pgac_cv_gcc_sync_int32_tas" = x"yes"; then
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AC_DEFINE(HAVE_GCC__SYNC_INT32_TAS, 1, [Define to 1 if you have __sync_lock_test_and_set(int *) and friends.])
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fi])# PGAC_HAVE_GCC__SYNC_INT32_TAS
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# PGAC_HAVE_GCC__SYNC_INT32_CAS
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# -------------------------
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# Check if the C compiler understands __sync_compare_and_swap() for 32bit
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# types, and define HAVE_GCC__SYNC_INT32_CAS if so.
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AC_DEFUN([PGAC_HAVE_GCC__SYNC_INT32_CAS],
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[AC_CACHE_CHECK(for builtin __sync int32 atomic operations, pgac_cv_gcc_sync_int32_cas,
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[AC_LINK_IFELSE([AC_LANG_PROGRAM([],
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[int val = 0;
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__sync_val_compare_and_swap(&val, 0, 37);])],
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[pgac_cv_gcc_sync_int32_cas="yes"],
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[pgac_cv_gcc_sync_int32_cas="no"])])
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if test x"$pgac_cv_gcc_sync_int32_cas" = x"yes"; then
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AC_DEFINE(HAVE_GCC__SYNC_INT32_CAS, 1, [Define to 1 if you have __sync_compare_and_swap(int *, int, int).])
|
|
fi])# PGAC_HAVE_GCC__SYNC_INT32_CAS
|
|
|
|
# PGAC_HAVE_GCC__SYNC_INT64_CAS
|
|
# -------------------------
|
|
# Check if the C compiler understands __sync_compare_and_swap() for 64bit
|
|
# types, and define HAVE_GCC__SYNC_INT64_CAS if so.
|
|
AC_DEFUN([PGAC_HAVE_GCC__SYNC_INT64_CAS],
|
|
[AC_CACHE_CHECK(for builtin __sync int64 atomic operations, pgac_cv_gcc_sync_int64_cas,
|
|
[AC_LINK_IFELSE([AC_LANG_PROGRAM([],
|
|
[PG_INT64_TYPE lock = 0;
|
|
__sync_val_compare_and_swap(&lock, 0, (PG_INT64_TYPE) 37);])],
|
|
[pgac_cv_gcc_sync_int64_cas="yes"],
|
|
[pgac_cv_gcc_sync_int64_cas="no"])])
|
|
if test x"$pgac_cv_gcc_sync_int64_cas" = x"yes"; then
|
|
AC_DEFINE(HAVE_GCC__SYNC_INT64_CAS, 1, [Define to 1 if you have __sync_compare_and_swap(int64 *, int64, int64).])
|
|
fi])# PGAC_HAVE_GCC__SYNC_INT64_CAS
|
|
|
|
# PGAC_HAVE_GCC__ATOMIC_INT32_CAS
|
|
# -------------------------
|
|
# Check if the C compiler understands __atomic_compare_exchange_n() for 32bit
|
|
# types, and define HAVE_GCC__ATOMIC_INT32_CAS if so.
|
|
AC_DEFUN([PGAC_HAVE_GCC__ATOMIC_INT32_CAS],
|
|
[AC_CACHE_CHECK(for builtin __atomic int32 atomic operations, pgac_cv_gcc_atomic_int32_cas,
|
|
[AC_LINK_IFELSE([AC_LANG_PROGRAM([],
|
|
[int val = 0;
|
|
int expect = 0;
|
|
__atomic_compare_exchange_n(&val, &expect, 37, 0, __ATOMIC_SEQ_CST, __ATOMIC_RELAXED);])],
|
|
[pgac_cv_gcc_atomic_int32_cas="yes"],
|
|
[pgac_cv_gcc_atomic_int32_cas="no"])])
|
|
if test x"$pgac_cv_gcc_atomic_int32_cas" = x"yes"; then
|
|
AC_DEFINE(HAVE_GCC__ATOMIC_INT32_CAS, 1, [Define to 1 if you have __atomic_compare_exchange_n(int *, int *, int).])
|
|
fi])# PGAC_HAVE_GCC__ATOMIC_INT32_CAS
|
|
|
|
# PGAC_HAVE_GCC__ATOMIC_INT64_CAS
|
|
# -------------------------
|
|
# Check if the C compiler understands __atomic_compare_exchange_n() for 64bit
|
|
# types, and define HAVE_GCC__ATOMIC_INT64_CAS if so.
|
|
AC_DEFUN([PGAC_HAVE_GCC__ATOMIC_INT64_CAS],
|
|
[AC_CACHE_CHECK(for builtin __atomic int64 atomic operations, pgac_cv_gcc_atomic_int64_cas,
|
|
[AC_LINK_IFELSE([AC_LANG_PROGRAM([],
|
|
[PG_INT64_TYPE val = 0;
|
|
PG_INT64_TYPE expect = 0;
|
|
__atomic_compare_exchange_n(&val, &expect, 37, 0, __ATOMIC_SEQ_CST, __ATOMIC_RELAXED);])],
|
|
[pgac_cv_gcc_atomic_int64_cas="yes"],
|
|
[pgac_cv_gcc_atomic_int64_cas="no"])])
|
|
if test x"$pgac_cv_gcc_atomic_int64_cas" = x"yes"; then
|
|
AC_DEFINE(HAVE_GCC__ATOMIC_INT64_CAS, 1, [Define to 1 if you have __atomic_compare_exchange_n(int64 *, int *, int64).])
|
|
fi])# PGAC_HAVE_GCC__ATOMIC_INT64_CAS
|
|
|
|
# PGAC_SSE42_CRC32_INTRINSICS
|
|
# -----------------------
|
|
# Check if the compiler supports the x86 CRC instructions added in SSE 4.2,
|
|
# using the _mm_crc32_u8 and _mm_crc32_u32 intrinsic functions. (We don't
|
|
# test the 8-byte variant, _mm_crc32_u64, but it is assumed to be present if
|
|
# the other ones are, on x86-64 platforms)
|
|
#
|
|
# An optional compiler flag can be passed as argument (e.g. -msse4.2). If the
|
|
# intrinsics are supported, sets pgac_sse42_crc32_intrinsics, and CFLAGS_SSE42.
|
|
AC_DEFUN([PGAC_SSE42_CRC32_INTRINSICS],
|
|
[define([Ac_cachevar], [AS_TR_SH([pgac_cv_sse42_crc32_intrinsics_$1])])dnl
|
|
AC_CACHE_CHECK([for _mm_crc32_u8 and _mm_crc32_u32 with CFLAGS=$1], [Ac_cachevar],
|
|
[pgac_save_CFLAGS=$CFLAGS
|
|
CFLAGS="$pgac_save_CFLAGS $1"
|
|
AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <nmmintrin.h>],
|
|
[unsigned int crc = 0;
|
|
crc = _mm_crc32_u8(crc, 0);
|
|
crc = _mm_crc32_u32(crc, 0);
|
|
/* return computed value, to prevent the above being optimized away */
|
|
return crc == 0;])],
|
|
[Ac_cachevar=yes],
|
|
[Ac_cachevar=no])
|
|
CFLAGS="$pgac_save_CFLAGS"])
|
|
if test x"$Ac_cachevar" = x"yes"; then
|
|
CFLAGS_SSE42="$1"
|
|
pgac_sse42_crc32_intrinsics=yes
|
|
fi
|
|
undefine([Ac_cachevar])dnl
|
|
])# PGAC_SSE42_CRC32_INTRINSICS
|