Implemented scalar FP16C instructions

Author: Const-me

Windows/whisper/whisper.vcxproj

@@ -74,7 +74,7 @@
     <ClCompile>
       <WarningLevel>Level3</WarningLevel>
       <SDLCheck>true</SDLCheck>
-      <PreprocessorDefinitions>WHISPER_SHARED;WHISPER_BUILD;_CRT_SECURE_NO_WARNINGS;WIN32;_DEBUG;WHISPER_EXPORTS;_WINDOWS;_USRDLL;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>__F16C__;WHISPER_SHARED;WHISPER_BUILD;_CRT_SECURE_NO_WARNINGS;WIN32;_DEBUG;WHISPER_EXPORTS;_WINDOWS;_USRDLL;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <ConformanceMode>true</ConformanceMode>
       <LanguageStandard>stdcpp20</LanguageStandard>
       <EnableEnhancedInstructionSet>AdvancedVectorExtensions2</EnableEnhancedInstructionSet>
@@ -91,7 +91,7 @@
       <FunctionLevelLinking>true</FunctionLevelLinking>
       <IntrinsicFunctions>true</IntrinsicFunctions>
       <SDLCheck>true</SDLCheck>
-      <PreprocessorDefinitions>WHISPER_SHARED;WHISPER_BUILD;_CRT_SECURE_NO_WARNINGS;WIN32;NDEBUG;WHISPER_EXPORTS;_WINDOWS;_USRDLL;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>__F16C__;WHISPER_SHARED;WHISPER_BUILD;_CRT_SECURE_NO_WARNINGS;WIN32;NDEBUG;WHISPER_EXPORTS;_WINDOWS;_USRDLL;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <ConformanceMode>true</ConformanceMode>
       <LanguageStandard>stdcpp20</LanguageStandard>
       <EnableEnhancedInstructionSet>AdvancedVectorExtensions2</EnableEnhancedInstructionSet>
@@ -108,7 +108,7 @@
     <ClCompile>
       <WarningLevel>Level3</WarningLevel>
       <SDLCheck>true</SDLCheck>
-      <PreprocessorDefinitions>WHISPER_SHARED;WHISPER_BUILD;_CRT_SECURE_NO_WARNINGS;_DEBUG;WHISPER_EXPORTS;_WINDOWS;_USRDLL;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>__F16C__;WHISPER_SHARED;WHISPER_BUILD;_CRT_SECURE_NO_WARNINGS;_DEBUG;WHISPER_EXPORTS;_WINDOWS;_USRDLL;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <ConformanceMode>true</ConformanceMode>
       <LanguageStandard>stdcpp20</LanguageStandard>
       <EnableEnhancedInstructionSet>AdvancedVectorExtensions2</EnableEnhancedInstructionSet>
@@ -125,7 +125,7 @@
       <FunctionLevelLinking>true</FunctionLevelLinking>
       <IntrinsicFunctions>true</IntrinsicFunctions>
       <SDLCheck>true</SDLCheck>
-      <PreprocessorDefinitions>WHISPER_SHARED;WHISPER_BUILD;_CRT_SECURE_NO_WARNINGS;NDEBUG;WHISPER_EXPORTS;_WINDOWS;_USRDLL;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>__F16C__;WHISPER_SHARED;WHISPER_BUILD;_CRT_SECURE_NO_WARNINGS;NDEBUG;WHISPER_EXPORTS;_WINDOWS;_USRDLL;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <ConformanceMode>true</ConformanceMode>
       <LanguageStandard>stdcpp20</LanguageStandard>
       <EnableEnhancedInstructionSet>AdvancedVectorExtensions2</EnableEnhancedInstructionSet>

ggml.c

@@ -139,15 +139,28 @@ ggml_fp16_t ggml_fp32_to_fp16(float x) {
 // ref: https://github.com/Maratyszcza/FP16
 
 #ifdef __F16C__
-float ggml_fp16_to_fp32(ggml_fp16_t h) {
-    return _cvtsh_ss(h);
+
+float ggml_fp16_to_fp32( ggml_fp16_t h )
+{
+	static_assert( sizeof( ggml_fp16_t ) == 2, "sizeof" );
+
+	__m128i iv = _mm_cvtsi32_si128( h );
+	__m128 fv = _mm_cvtph_ps( iv );
+	return _mm_cvtss_f32( fv );
 }
-ggml_fp16_t ggml_fp32_to_fp16(float f) {
-    return _cvtss_sh(f, 0);
+
+ggml_fp16_t ggml_fp32_to_fp16( float f )
+{
+	static_assert( sizeof( ggml_fp16_t ) == 2, "sizeof" );
+
+	__m128 fv = _mm_set_ss( f );
+	__m128i iv = _mm_cvtps_ph( fv, 0 );
+	uint32_t i32 = (uint32_t)_mm_cvtsi128_si32( iv );
+	return (ggml_fp16_t)(uint16_t)i32;
 }
 
-#define GGML_FP16_TO_FP32(x) _cvtsh_ss(x)
-#define GGML_FP32_TO_FP16(x) _cvtss_sh(x, 0)
+#define GGML_FP16_TO_FP32(x) ggml_fp16_to_fp32(x)
+#define GGML_FP32_TO_FP16(x) ggml_fp32_to_fp16(x)
 
 #else