Add f16c (halffloat) cpuid

include/libyuv/cpu_id.h

 /*
  *  Copyright 2011 The LibYuv Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS. All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 13 matching lines @@
 // These flags are only valid on ARM processors.
 static const int kCpuHasARM = 0x2;
 static const int kCpuHasNEON = 0x4;
 // 0x8 reserved for future ARM flag.
 
 // These flags are only valid on x86 processors.
 static const int kCpuHasX86 = 0x10;
 static const int kCpuHasSSE2 = 0x20;
 static const int kCpuHasSSSE3 = 0x40;
 static const int kCpuHasSSE41 = 0x80;
-static const int kCpuHasSSE42 = 0x100;
+static const int kCpuHasSSE42 = 0x100;  // unused at this time.
 static const int kCpuHasAVX = 0x200;
 static const int kCpuHasAVX2 = 0x400;
 static const int kCpuHasERMS = 0x800;
 static const int kCpuHasFMA3 = 0x1000;
 static const int kCpuHasAVX3 = 0x2000;
-// 0x2000, 0x4000, 0x8000 reserved for future X86 flags.
+static const int kCpuHasF16C = 0x4000;
+
+// 0x8000 reserved for future X86 flags.
 
 // These flags are only valid on MIPS processors.
 static const int kCpuHasMIPS = 0x10000;
 static const int kCpuHasDSPR2 = 0x20000;
 static const int kCpuHasMSA = 0x40000;
 
 // Internal function used to auto-init.
 LIBYUV_API
 int InitCpuFlags(void);
 
@@ skipping 21 matching lines @@
 // ecx is typically the cpu number, and should normally be zero.
 LIBYUV_API
 void CpuId(uint32 eax, uint32 ecx, uint32* cpu_info);
 
 #ifdef __cplusplus
 }  // extern "C"
 }  // namespace libyuv
 #endif
 
 #endif  // INCLUDE_LIBYUV_CPU_ID_H_