CMake: check _mm256_setr_m128i is supported

Some older AVX2 compilers don't have it, but it's possible to use a macro instead [^1].

[^1]: https://stackoverflow.com/a/32630658/1266123

Signed-off-by: Steve Lhomme <robux4@ycbcr.xyz>

Author: robUx4

src/CMakeLists.txt

@@ -120,6 +120,25 @@ elseif(UNIX OR MINGW)
     endif()
     if(HAS_AVX2)
       set_property(SOURCE ${AVX} APPEND PROPERTY COMPILE_FLAGS "-mavx2")
+      # check _mm256_setr_m128i is supported
+      include(CheckCSourceCompiles)
+      include(CMakePushCheckState)
+
+      cmake_push_check_state(RESET)
+      set(CMAKE_REQUIRED_FLAGS "-mavx2")
+      check_c_source_compiles("
+      #include <immintrin.h>
+      int main(void)
+      {
+        __m128i a, b;
+        _mm256_setr_m128i(a, b);
+        return 0;
+      }
+      " HAVE_MM256_SETR)
+      cmake_pop_check_state()
+      if(HAVE_MM256_SETR)
+        set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DHAVE_MM256_SETR")
+      endif(HAVE_MM256_SETR)
     endif()
   endif()
 

src/avx/oapv_tq_avx.c

@@ -32,6 +32,12 @@
 #include "oapv_def.h"
 #include "oapv_tq_avx.h"
 
+#ifndef HAVE_MM256_SETR
+#define _mm256_set_m128i(v0, v1)  _mm256_insertf128_si256(_mm256_castsi128_si256(v1), (v0), 1)
+#define _mm256_setr_m128i(v0, v1) _mm256_set_m128i((v1), (v0))
+#endif
+
+
 #if X86_SSE
 #ifndef _mm256_set_m128i
 #define _mm256_set_m128i(/* __m128i */ hi, /* __m128i */ lo) \