Detect SIMD availability from compiler

benchmarks/BM_OPF_high_vs_low.cpp

@@ -5,17 +5,14 @@
 // If not, contact the sfizz maintainers at https://github.com/sfztools/sfizz
 
 #include "Config.h"
+#include "SIMDConfig.h"
 #include <benchmark/benchmark.h>
 #include <absl/types/span.h>
 #include <random>
 #include <algorithm>
 
-#if HAVE_X86INTRIN_H
-#include <x86intrin.h>
-#endif
-
-#if HAVE_INTRIN_H
-#include <intrin.h>
+#if SFIZZ_HAVE_SSE2
+#include <emmintrin.h>
 #endif
 
 constexpr float filterGain { 0.25f };

cmake/SfizzSIMDSourceFilesCheck.cmake

@@ -1,31 +1,14 @@
-# Check SIMD
-include (CheckIncludeFiles)
-CHECK_INCLUDE_FILES(x86intrin.h HAVE_X86INTRIN_H)
-CHECK_INCLUDE_FILES(intrin.h HAVE_INTRIN_H)
-
-if (!APPLE)
-CHECK_INCLUDE_FILES (arm_neon.h HAVE_ARM_NEON_H)
-endif()
+set (SFIZZ_SIMD_SOURCES
+    sfizz/SIMDSSE.cpp
+    sfizz/SIMDNEON.cpp
+    sfizz/SIMDDummy.cpp)
 
 # SIMD checks
-if (HAVE_X86INTRIN_H AND UNIX)
-    add_compile_options (-DHAVE_X86INTRIN_H)
-    set (SFIZZ_SIMD_SOURCES sfizz/SIMDSSE.cpp)
-elseif (HAVE_INTRIN_H AND WIN32)
-    if (CMAKE_CXX_COMPILER_ID MATCHES "MSVC")
-        add_compile_options ("/DHAVE_INTRIN_H")
-    else()
-        add_compile_options ("-DHAVE_INTRIN_H")
-    endif()
-    set (SFIZZ_SIMD_SOURCES sfizz/SIMDSSE.cpp)
-elseif (CMAKE_SYSTEM_PROCESSOR STREQUAL "armv7l")
+if (CMAKE_SYSTEM_PROCESSOR STREQUAL "armv7l")
     add_compile_options (-DHAVE_ARM_NEON_H)
     add_compile_options (-mfpu=neon)
     add_compile_options (-march=native)
     add_compile_options (-mtune=cortex-a53)
-    set (SFIZZ_SIMD_SOURCES sfizz/SIMDNEON.cpp)
-else()
-    set (SFIZZ_SIMD_SOURCES sfizz/SIMDDummy.cpp)
 endif()
 
 set (SFIZZ_SOURCES ${SFIZZ_SOURCES} ${SFIZZ_SIMD_SOURCES})

src/sfizz/SIMDConfig.h

@@ -0,0 +1,69 @@
+// SPDX-License-Identifier: BSD-2-Clause
+
+// This code is part of the sfizz library and is licensed under a BSD 2-clause
+// license. You should have receive a LICENSE.md file along with the code.
+// If not, contact the sfizz maintainers at https://github.com/sfztools/sfizz
+
+#pragma once
+
+/**
+   Define the following macros, 1 if available, otherwise 0.
+   These are allowed to be defined externally, in case automatic detection would
+   fail based on the compiler predefinitions.
+
+   - SFIZZ_HAVE_SSE
+   - SFIZZ_HAVE_SSE2
+   - SFIZZ_HAVE_NEON
+ */
+
+#if defined(__GNUC__)
+#   if defined(__SSE2__)
+#       define SFIZZ_DETECT_SSE 1
+#       define SFIZZ_DETECT_SSE2 1
+#   elif defined(__SSE__)
+#       define SFIZZ_DETECT_SSE 1
+#       define SFIZZ_DETECT_SSE2 0
+#   else
+#       define SFIZZ_DETECT_SSE 0
+#       define SFIZZ_DETECT_SSE2 0
+#   endif
+#   if defined(__ARM_NEON__)
+#       define SFIZZ_DETECT_NEON 1
+#   else
+#       define SFIZZ_DETECT_NEON 0
+#   endif
+#elif defined(_MSC_VER)
+#   if defined(_M_AMD64) || defined(_M_X64)
+#       define SFIZZ_DETECT_SSE 1
+#       define SFIZZ_DETECT_SSE2 1
+#   elif _M_IX86_FP == 2
+#       define SFIZZ_DETECT_SSE 1
+#       define SFIZZ_DETECT_SSE2 1
+#   elif _M_IX86_FP == 1
+#       define SFIZZ_DETECT_SSE 1
+#       define SFIZZ_DETECT_SSE2 0
+#   endif
+// TODO: how to check for NEON on MSVC ARM?
+#endif
+
+#ifndef SFIZZ_HAVE_SSE
+#   ifdef SFIZZ_DETECT_SSE
+#       define SFIZZ_HAVE_SSE SFIZZ_DETECT_SSE
+#   else
+#       define SFIZZ_HAVE_SSE 0
+#   endif
+#endif
+#ifndef SFIZZ_HAVE_SSE2
+#   ifdef SFIZZ_DETECT_SSE2
+#       define SFIZZ_HAVE_SSE2 SFIZZ_DETECT_SSE2
+#   else
+#       define SFIZZ_HAVE_SSE2 0
+#   endif
+#endif
+#ifndef SFIZZ_HAVE_NEON
+#   ifdef SFIZZ_DETECT_NEON
+#       define SFIZZ_HAVE_NEON SFIZZ_DETECT_NEON
+#   else
+#       define SFIZZ_HAVE_NEON 0
+#   endif
+#endif

src/sfizz/SIMDDummy.cpp

@@ -4,6 +4,10 @@
 // license. You should have receive a LICENSE.md file along with the code.
 // If not, contact the sfizz maintainers at https://github.com/sfztools/sfizz
 
+#include "SIMDConfig.h"
+
+#if !(SFIZZ_HAVE_SSE2 || SFIZZ_HAVE_NEON)
+
 #include "SIMDHelpers.h"
 
 template <>
@@ -163,3 +167,5 @@ void sfz::diff<float, true>(absl::Span<const float> input, absl::Span<float> out
 {
     diff<float, false>(input, output);
 }
+
+#endif // !(SFIZZ_HAVE_SSE2 || SFIZZ_HAVE_NEON)

src/sfizz/SIMDNEON.cpp

@@ -21,8 +21,12 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-#include <arm_neon.h>
+#include "SIMDConfig.h"
+
+#if SFIZZ_HAVE_NEON
+
 #include "SIMDHelpers.h"
+#include <arm_neon.h>
 
 using Type = float;
 [[maybe_unused]] constexpr uintptr_t TypeAlignment { 4 };
@@ -234,3 +238,5 @@ void sfz::diff<float, true>(absl::Span<const float> input, absl::Span<float> out
 {
     diff<float, false>(input, output);
 }
+
+#endif // SFIZZ_HAVE_NEON

src/sfizz/SIMDSSE.cpp

@@ -4,16 +4,14 @@
 // license. You should have receive a LICENSE.md file along with the code.
 // If not, contact the sfizz maintainers at https://github.com/sfztools/sfizz
 
+#include "SIMDConfig.h"
+
+#if SFIZZ_HAVE_SSE2
+
 #include "SIMDHelpers.h"
 #include <array>
 #include <xmmintrin.h>
-#if HAVE_X86INTRIN_H
-#include <x86intrin.h>
-#endif
-
-#if HAVE_INTRIN_H
-#include <intrin.h>
-#endif
+#include <emmintrin.h>
 
 #include "mathfuns/sse_mathfun.h"
 
@@ -783,3 +781,5 @@ void sfz::diff<float, true>(absl::Span<const float> input, absl::Span<float> out
     while (in < sentinel)
         _internals::snippetDiff(in, out);
 }
+
+#endif // SFIZZ_HAVE_SSE2

src/sfizz/ScopedFTZ.cpp

@@ -5,22 +5,21 @@
 // If not, contact the sfizz maintainers at https://github.com/sfztools/sfizz
 
 #include "ScopedFTZ.h"
-#if (HAVE_X86INTRIN_H)
-#include <x86intrin.h>
-#elif (HAVE_INTRIN_H)
-#include <intrin.h>
-#elif (HAVE_ARM_NEON_H)
+#include "SIMDConfig.h"
+#if SFIZZ_HAVE_SSE
+#include <pmmintrin.h> // x86 CSR is SSE, but FTZ bits SSE3 and up
+#elif SFIZZ_HAVE_NEON
 #include "arm_neon.h"
 #endif
 
 
 ScopedFTZ::ScopedFTZ()
 {
-#if (HAVE_X86INTRIN_H || HAVE_INTRIN_H)
+#if SFIZZ_HAVE_SSE
     unsigned mask = _MM_DENORMALS_ZERO_MASK | _MM_FLUSH_ZERO_MASK;
     registerState = _mm_getcsr();
     _mm_setcsr((registerState & (~mask)) | mask);
-#elif HAVE_ARM_NEON_H
+#elif SFIZZ_HAVE_NEON
     intptr_t mask = (1 << 24);
     asm volatile("vmrs %0, fpscr" : "=r"(registerState));
     asm volatile("vmsr fpscr, %0" : : "ri"((registerState & (~mask)) | mask));
@@ -29,9 +28,9 @@ ScopedFTZ::ScopedFTZ()
 
 ScopedFTZ::~ScopedFTZ()
 {
-#if (HAVE_X86INTRIN_H || HAVE_INTRIN_H)
+#if SFIZZ_HAVE_SSE
     _mm_setcsr(registerState);
-#elif HAVE_ARM_NEON_H
+#elif SFIZZ_HAVE_NEON
     asm volatile("vmrs %0, fpscr" : : "ri"(registerState));
 #endif
 }