mirror of https://github.com/AxioDL/boo.git
95 lines
3.3 KiB
CMake
95 lines
3.3 KiB
CMake
# - Finds SIMD support
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#
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# The following variables are set:
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# SIMD_C_FLAGS - flags to add to the C compiler for this package.
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# SIMD_FOUND - true if support for this package is found.
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#
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#=============================================================================
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# Based on FindOpenMP.cmake, which is:
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#
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# Copyright 2009 Kitware, Inc.
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# Copyright 2008-2009 André Rigland Brodtkorb <Andre.Brodtkorb@ifi.uio.no>
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are
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# met:
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#
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# * Redistributions of source code must retain the above copyright notice,
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# this list of conditions and the following disclaimer.
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#
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# * Redistributions in binary form must reproduce the above copyright notice,
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# this list of conditions and the following disclaimer in the documentation
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# and/or other materials provided with the distribution.
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#
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# * The names of Kitware, Inc., the Insight Consortium, or the names of
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# any consortium members, or of any contributors, may not be used to
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# endorse or promote products derived from this software without
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# specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER AND CONTRIBUTORS ``AS IS''
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# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR
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# ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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include (CheckCSourceCompiles)
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include (FindPackageHandleStandardArgs)
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if (WIN32) # Safety for when mixed lib/app compilers (but performance hit)
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set (GCC_WIN32_SIMD_OPTS "-mincoming-stack-boundary=2")
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endif ()
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set (SIMD_C_FLAG_CANDIDATES
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# x64
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" "
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# Microsoft Visual Studio x86
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"/arch:SSE /fp:fast -D__SSE__"
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# Gcc x86
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"-msse -mfpmath=sse ${GCC_WIN32_SIMD_OPTS}"
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# Gcc x86 (old versions)
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"-msse -mfpmath=sse"
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)
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set (SIMD_C_TEST_SOURCE
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"
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#include <xmmintrin.h>
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int main()
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{
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__m128 a, b;
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float vals[4] = {0};
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a = _mm_loadu_ps (vals);
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b = a;
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b = _mm_add_ps (a,b);
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_mm_storeu_ps (vals,b);
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return 0;
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}
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")
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if (DEFINED SIMD_C_FLAGS)
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set (SIMD_C_FLAG_CANDIDATES)
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endif ()
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foreach (FLAG ${SIMD_C_FLAG_CANDIDATES})
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set (SAFE_CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS}")
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set (CMAKE_REQUIRED_FLAGS "${FLAG}")
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unset (SIMD_FLAG_DETECTED CACHE)
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message (STATUS "Try SIMD C flag = [${FLAG}]")
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check_c_source_compiles ("${SIMD_C_TEST_SOURCE}" SIMD_FLAG_DETECTED)
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set (CMAKE_REQUIRED_FLAGS "${SAFE_CMAKE_REQUIRED_FLAGS}")
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if (SIMD_FLAG_DETECTED)
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set (SIMD_C_FLAGS_INTERNAL "${FLAG}")
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break ()
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endif ()
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endforeach ()
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set (SIMD_C_FLAGS "${SIMD_C_FLAGS_INTERNAL}"
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CACHE STRING "C compiler flags for SIMD vectorization")
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find_package_handle_standard_args (SIMD DEFAULT_MSG SIMD_C_FLAGS SIMD_C_FLAGS)
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mark_as_advanced (SIMD_C_FLAGS)
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