MSVC ARM64/ARM64EC support - removed xmmintrin.h, updated platform detection in CMake script

Signed-off-by: Jean-Marc Valin <jmvalin@jmvalin.ca>

Author: Piotr Pawlowski

celt/float_cast.h

@@ -69,7 +69,7 @@ static OPUS_INLINE opus_int32 float2int(float x) {return _mm_cvt_ss2si(_mm_set_s
 
 #elif (defined(_MSC_VER) && _MSC_VER >= 1400) && (defined(_M_X64) || (defined(_M_IX86_FP) && _M_IX86_FP >= 1))
 
-        #include <xmmintrin.h>
+        #include <intrin.h>
         static OPUS_INLINE opus_int32 float2int(float value)
         {
                 /* _mm_load_ss will generate same code as _mm_set_ss

cmake/OpusConfig.cmake

@@ -51,14 +51,21 @@ check_symbol_exists(lrint "math.h" HAVE_LRINT)
 check_symbol_exists(elf_aux_info "sys/auxv.h" HAVE_ELF_AUX_INFO)
 cmake_pop_check_state()
 
-if(CMAKE_SYSTEM_PROCESSOR MATCHES "(i[0-9]86|x86|X86|amd64|AMD64|x86_64)")
+message(STATUS "Check CPU arch: CMAKE_GENERATOR_PLATFORM=${CMAKE_GENERATOR_PLATFORM} CMAKE_SYSTEM_PROCESSOR=${CMAKE_SYSTEM_PROCESSOR}")
+
+if(CMAKE_GENERATOR_PLATFORM MATCHES "(arm64|ARM64|arm64ec|ARM64EC)")
+# Microsoft ARM mode, override other checks
+# CMake still doesn't recognize it, CMAKE_SYSTEM_PROCESSOR is AMD64
+  set(OPUS_CPU_ARM_MS)
+  set(OPUS_CPU_ARM 1)
+elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "(arm|aarch64|ARM)")
+  set(OPUS_CPU_ARM 1)
+elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "(i[0-9]86|x86|X86|amd64|AMD64|x86_64)")
   if(CMAKE_SIZEOF_VOID_P EQUAL 8)
     set(OPUS_CPU_X64 1)
   else()
     set(OPUS_CPU_X86 1)
   endif()
-elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "(arm|aarch64|ARM)")
-  set(OPUS_CPU_ARM 1)
 endif()
 
 if(NOT OPUS_DISABLE_INTRINSICS)
@@ -68,12 +75,16 @@ endif()
 if(OPUS_CPU_X86 OR OPUS_CPU_X64 AND NOT OPUS_DISABLE_INTRINSICS)
   opus_detect_sse(COMPILER_SUPPORT_SIMD)
 elseif(OPUS_CPU_ARM AND NOT OPUS_DISABLE_INTRINSICS)
-  opus_detect_neon(COMPILER_SUPPORT_NEON)
+  if (OPUS_CPU_ARM_MS)
+    set(COMPILER_SUPPORT_NEON 1)
+  else()
+    opus_detect_neon(COMPILER_SUPPORT_NEON)
+  endif()
   if(COMPILER_SUPPORT_NEON)
     option(OPUS_USE_NEON "Option to enable NEON" ON)
     option(OPUS_MAY_HAVE_NEON "Does runtime check for neon support" ON)
     option(OPUS_PRESUME_NEON "Assume target CPU has NEON support" OFF)
-    if(CMAKE_SYSTEM_PROCESSOR MATCHES "aarch64")
+    if(OPUS_CPU_ARM_MS OR CMAKE_SYSTEM_PROCESSOR MATCHES "aarch64")
       set(OPUS_PRESUME_NEON ON)
     elseif(CMAKE_SYSTEM_NAME MATCHES "iOS")
       set(OPUS_PRESUME_NEON ON)