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# SoX Resampler Library Copyright (c) 2007-16 robs@users.sourceforge.net
# Licence for this file: LGPL v2.1 See LICENCE for details.
# - Finds SIMD32 support
#
# The following variables are set:
# SIMD32_C_FLAGS - flags to add to the C compiler for this package.
# SIMD32_FOUND - true if support for this package is found.
if (DEFINED SIMD32_C_FLAGS)
set (TRIAL_C_FLAGS)
elseif (CMAKE_SYSTEM_PROCESSOR MATCHES "^arm")
set (TRIAL_C_FLAGS
# Gcc
"-mfpu=neon-vfpv4 -mcpu=cortex-a7"
"-mfpu=neon -mfloat-abi=hard"
"-mfpu=neon -mfloat-abi=softfp"
"-mfpu=neon -mfloat-abi=soft"
)
set (TEST_C_SOURCE "
#include <arm_neon.h>
int main(int c, char * * v) {
float32x4_t a = vdupq_n_f32((float)c), b = vdupq_n_f32((float)!!v);
return !vgetq_lane_u32(vceqq_f32(a,b),0);
}
")
else ()
if (WIN32) # Safety for when mixed lib/app compilers (but performance hit)
set (GCC_WIN32_SIMD32_OPTS "-mincoming-stack-boundary=2")
endif ()
set (TRIAL_C_FLAGS
# x64
" "
# MSVC x86
"/arch:SSE /fp:fast -D__SSE__"
# Gcc x86
"-msse -mfpmath=sse ${GCC_WIN32_SIMD32_OPTS}"
# Gcc x86 (old versions)
"-msse -mfpmath=sse"
)
set (TEST_C_SOURCE "
#include <xmmintrin.h>
int main(int c, char * * v) {
__m128 a = _mm_set_ss((float)c), b = _mm_set_ss((float)!!v);
return _mm_comineq_ss(a,b);
}
")
endif ()
include (FindCFlags)
FindCFlags ("SIMD32" "FLOAT-32 (single-precision) SIMD vectorization"
"${TRIAL_C_FLAGS}" "${TEST_C_SOURCE}")
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