libvpx: Pull from upstream

source/libvpx/third_party/libyuv/source/cpu_id.cc

 /*
  *  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.
  */
 
 #include "libyuv/cpu_id.h"
 
-#if defined(_MSC_VER) && !defined(__clang__)
+#if (defined(_MSC_VER) && !defined(__clang__)) && !defined(__clang__)
 #include <intrin.h>  // For __cpuidex()
 #endif
 #if !defined(__pnacl__) && !defined(__CLR_VER) && \
-    !defined(__native_client__)  && \
-    defined(_MSC_VER) && (_MSC_FULL_VER >= 160040219) && \
-    (defined(_M_IX86) || defined(_M_X64))
+    !defined(__native_client__) && (defined(_M_IX86) || defined(_M_X64)) && \
+    defined(_MSC_VER) && !defined(__clang__) && (_MSC_FULL_VER >= 160040219)
 #include <immintrin.h>  // For _xgetbv()
 #endif
 
 #if !defined(__native_client__)
 #include <stdlib.h>  // For getenv()
 #endif
 
 // For ArmCpuCaps() but unittested on all platforms
 #include <stdio.h>
 #include <string.h>
 
 #include "libyuv/basic_types.h"  // For CPU_X86
 
 #ifdef __cplusplus
 namespace libyuv {
 extern "C" {
 #endif
 
 // For functions that use the stack and have runtime checks for overflow,
 // use SAFEBUFFERS to avoid additional check.
-#if defined(_MSC_VER) && (_MSC_FULL_VER >= 160040219)
+#if (defined(_MSC_VER) && !defined(__clang__)) && (_MSC_FULL_VER >= 160040219)
 #define SAFEBUFFERS __declspec(safebuffers)
 #else
 #define SAFEBUFFERS
 #endif
 
-// Low level cpuid for X86. Returns zeros on other CPUs.
-#if !defined(__pnacl__) && !defined(__CLR_VER) && \
-    (defined(_M_IX86) || defined(_M_X64) || \
-    defined(__i386__) || defined(__x86_64__))
+// Low level cpuid for X86.
+#if (defined(_M_IX86) || defined(_M_X64) || \
+    defined(__i386__) || defined(__x86_64__)) && \
+    !defined(__pnacl__) && !defined(__CLR_VER)
 LIBYUV_API
 void CpuId(uint32 info_eax, uint32 info_ecx, uint32* cpu_info) {
-#if defined(_MSC_VER) && !defined(__clang__)
+#if (defined(_MSC_VER) && !defined(__clang__)) && !defined(__clang__)
+// Visual C version uses intrinsic or inline x86 assembly.
 #if (_MSC_FULL_VER >= 160040219)
   __cpuidex((int*)(cpu_info), info_eax, info_ecx);
-#endif
-#if defined(_M_IX86)
+#elif defined(_M_IX86)
   __asm {
     mov        eax, info_eax
     mov        ecx, info_ecx
     mov        edi, cpu_info
     cpuid
     mov        [edi], eax
     mov        [edi + 4], ebx
     mov        [edi + 8], ecx
     mov        [edi + 12], edx
   }
 #else
   if (info_ecx == 0) {
     __cpuid((int*)(cpu_info), info_eax);
   } else {
     cpu_info[3] = cpu_info[2] = cpu_info[1] = cpu_info[0] = 0;
   }
 #endif
-#else  // defined(_MSC_VER)
+// GCC version uses inline x86 assembly.
+#else  // (defined(_MSC_VER) && !defined(__clang__)) && !defined(__clang__)
   uint32 info_ebx, info_edx;
   asm volatile (  // NOLINT
 #if defined( __i386__) && defined(__PIC__)
     // Preserve ebx for fpic 32 bit.
     "mov %%ebx, %%edi                          \n"
     "cpuid                                     \n"
     "xchg %%edi, %%ebx                         \n"
     : "=D" (info_ebx),
 #else
     "cpuid                                     \n"
     : "=b" (info_ebx),
 #endif  //  defined( __i386__) && defined(__PIC__)
       "+a" (info_eax), "+c" (info_ecx), "=d" (info_edx));
   cpu_info[0] = info_eax;
   cpu_info[1] = info_ebx;
   cpu_info[2] = info_ecx;
   cpu_info[3] = info_edx;
-#endif  // defined(_MSC_VER)
+#endif  // (defined(_MSC_VER) && !defined(__clang__)) && !defined(__clang__)
 }
-
-#if !defined(__native_client__)
-#define HAS_XGETBV
-// X86 CPUs have xgetbv to detect OS saves high parts of ymm registers.
-int TestOsSaveYmm() {
-  uint32 xcr0 = 0u;
-#if defined(_MSC_VER) && (_MSC_FULL_VER >= 160040219)
-  xcr0 = (uint32)(_xgetbv(0));  // VS2010 SP1 required.
-#endif
-#if defined(_M_IX86) && defined(_MSC_VER)
-  __asm {
-    xor        ecx, ecx    // xcr 0
-    _asm _emit 0x0f _asm _emit 0x01 _asm _emit 0xd0  // For VS2010 and earlier.
-    mov        xcr0, eax
-  }
-#endif
-#if defined(__i386__) || defined(__x86_64__)
-  asm(".byte 0x0f, 0x01, 0xd0" : "=a" (xcr0) : "c" (0) : "%edx");
-#endif  // defined(_MSC_VER)
-  return((xcr0 & 6) == 6);  // Is ymm saved?
-}
-#endif  // !defined(__native_client__)
-#else
+#else  // (defined(_M_IX86) || defined(_M_X64) ...
 LIBYUV_API
 void CpuId(uint32 eax, uint32 ecx, uint32* cpu_info) {
   cpu_info[0] = cpu_info[1] = cpu_info[2] = cpu_info[3] = 0;
 }
 #endif
 
+// TODO(fbarchard): Enable xgetbv when validator supports it.
+#if (defined(_M_IX86) || defined(_M_X64) || \
+    defined(__i386__) || defined(__x86_64__)) && \
+    !defined(__pnacl__) && !defined(__CLR_VER) && !defined(__native_client__)
+#define HAS_XGETBV
+// X86 CPUs have xgetbv to detect OS saves high parts of ymm registers.
+int TestOsSaveYmm() {
+  uint32 xcr0 = 0u;
+#if (defined(_MSC_VER) && !defined(__clang__)) && (_MSC_FULL_VER >= 160040219)
+  xcr0 = (uint32)(_xgetbv(0));  // VS2010 SP1 required.
+#elif defined(_M_IX86) && defined(_MSC_VER) && !defined(__clang__)
+  __asm {
+    xor        ecx, ecx    // xcr 0
+    _asm _emit 0x0f _asm _emit 0x01 _asm _emit 0xd0  // For VS2010 and earlier.
+    mov        xcr0, eax
+  }
+#elif defined(__i386__) || defined(__x86_64__)
+  asm(".byte 0x0f, 0x01, 0xd0" : "=a" (xcr0) : "c" (0) : "%edx");
+#endif  // defined(__i386__) || defined(__x86_64__)
+  return((xcr0 & 6) == 6);  // Is ymm saved?
+}
+#endif  // defined(_M_IX86) || defined(_M_X64) ..
+
 // based on libvpx arm_cpudetect.c
 // For Arm, but public to allow testing on any CPU
 LIBYUV_API SAFEBUFFERS
 int ArmCpuCaps(const char* cpuinfo_name) {
   char cpuinfo_line[512];
   FILE* f = fopen(cpuinfo_name, "r");
   if (!f) {
     // Assume Neon if /proc/cpuinfo is unavailable.
     // This will occur for Chrome sandbox for Pepper or Render process.
     return kCpuHasNEON;
@@ skipping 164 matching lines @@
 
 LIBYUV_API
 void MaskCpuFlags(int enable_flags) {
   cpu_info_ = InitCpuFlags() & enable_flags;
 }
 
 #ifdef __cplusplus
 }  // extern "C"
 }  // namespace libyuv
 #endif