mirror of
https://github.com/ceph/ceph
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80 lines
3.3 KiB
Plaintext
80 lines
3.3 KiB
Plaintext
# ===========================================================================
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# http://www.gnu.org/software/autoconf-archive/ax_gcc_x86_avx_xgetbv.html
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# ===========================================================================
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#
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# SYNOPSIS
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#
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# AX_GCC_X86_AVX_XGETBV
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#
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# DESCRIPTION
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#
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# On later x86 processors with AVX SIMD support, with gcc or a compiler
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# that has a compatible syntax for inline assembly instructions, run a
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# small program that executes the xgetbv instruction with input OP. This
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# can be used to detect if the OS supports AVX instruction usage.
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#
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# On output, the values of the eax and edx registers are stored as
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# hexadecimal strings as "eax:edx" in the cache variable
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# ax_cv_gcc_x86_avx_xgetbv.
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#
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# If the xgetbv instruction fails (because you are running a
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# cross-compiler, or because you are not using gcc, or because you are on
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# a processor that doesn't have this instruction),
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# ax_cv_gcc_x86_avx_xgetbv_OP is set to the string "unknown".
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#
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# This macro mainly exists to be used in AX_EXT.
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#
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# LICENSE
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#
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# Copyright (c) 2013 Michael Petch <mpetch@capp-sysware.com>
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#
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# This program is free software: you can redistribute it and/or modify it
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# under the terms of the GNU General Public License as published by the
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# Free Software Foundation, either version 3 of the License, or (at your
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# option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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# Public License for more details.
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#
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# You should have received a copy of the GNU General Public License along
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# with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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# As a special exception, the respective Autoconf Macro's copyright owner
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# gives unlimited permission to copy, distribute and modify the configure
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# scripts that are the output of Autoconf when processing the Macro. You
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# need not follow the terms of the GNU General Public License when using
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# or distributing such scripts, even though portions of the text of the
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# Macro appear in them. The GNU General Public License (GPL) does govern
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# all other use of the material that constitutes the Autoconf Macro.
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#
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# This special exception to the GPL applies to versions of the Autoconf
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# Macro released by the Autoconf Archive. When you make and distribute a
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# modified version of the Autoconf Macro, you may extend this special
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# exception to the GPL to apply to your modified version as well.
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#serial 1
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AC_DEFUN([AX_GCC_X86_AVX_XGETBV],
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[AC_REQUIRE([AC_PROG_CC])
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AC_LANG_PUSH([C])
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AC_CACHE_CHECK(for x86-AVX xgetbv $1 output, ax_cv_gcc_x86_avx_xgetbv_$1,
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[AC_RUN_IFELSE([AC_LANG_PROGRAM([#include <stdio.h>], [
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int op = $1, eax, edx;
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FILE *f;
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/* Opcodes for xgetbv */
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__asm__(".byte 0x0f, 0x01, 0xd0"
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: "=a" (eax), "=d" (edx)
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: "c" (op));
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f = fopen("conftest_xgetbv", "w"); if (!f) return 1;
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fprintf(f, "%x:%x\n", eax, edx);
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fclose(f);
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return 0;
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])],
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[ax_cv_gcc_x86_avx_xgetbv_$1=`cat conftest_xgetbv`; rm -f conftest_xgetbv],
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[ax_cv_gcc_x86_avx_xgetbv_$1=unknown; rm -f conftest_xgetbv],
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[ax_cv_gcc_x86_avx_xgetbv_$1=unknown])])
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AC_LANG_POP([C])
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])
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