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_mm_loadu_si23() needs immintrin.h on MSVC

--- a/celt/x86/x86cpu.h

+++ b/celt/x86/x86cpu.h

@@ -73,6 +73,9 @@

 #   include <string.h>

 #   include <emmintrin.h>

+#   ifdef _mm_loadu_si32

+#    undef _mm_loadu_si32

+#   endif

 #   define _mm_loadu_si32 WORKAROUND_mm_loadu_si32

 static inline __m128i WORKAROUND_mm_loadu_si32(void const* mem_addr) {

   int val;

@@ -79,6 +82,9 @@

   memcpy(&val, mem_addr, sizeof(val));

   return _mm_cvtsi32_si128(val);

 }

+#  elif defined(_MSC_VER)

+    /* MSVC needs this for _mm_loadu_si32 */

+#   include <immintrin.h>

 #  endif

 #  define OP_CVTEPI8_EPI32_M32(x) \

-- 

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