libyuv::CpuId as function to reduce header dependencies

BUG=none
TEST=libyuv_unittest.exe  --gtest_catch_exceptions=0 --gtest_filter=*Cpu*
Review URL: https://webrtc-codereview.appspot.com/566007

git-svn-id: http://libyuv.googlecode.com/svn/trunk@259 16f28f9a-4ce2-e073-06de-1de4eb20be90

README.chromium

@@ -1,6 +1,6 @@
 Name: libyuv
 URL: http://code.google.com/p/libyuv/
-Version: 258
+Version: 259
 License: BSD
 License File: LICENSE
 

include/libyuv/cpu_id.h

@@ -11,29 +11,6 @@
 #ifndef INCLUDE_LIBYUV_CPU_ID_H_
 #define INCLUDE_LIBYUV_CPU_ID_H_
 
-#ifdef _MSC_VER
-#include <intrin.h>  // For __cpuid()
-#endif
-
-// TODO(fbarchard): Use cpuid.h when gcc 4.4 is used on OSX and Linux.
-#if (defined(__pic__) || defined(__APPLE__)) && defined(__i386__)
-static __inline void __cpuid(int cpu_info[4], int info_type) {
-  asm volatile (
-    "mov %%ebx, %%edi                          \n"
-    "cpuid                                     \n"
-    "xchg %%edi, %%ebx                         \n"
-    : "=a"(cpu_info[0]), "=D"(cpu_info[1]), "=c"(cpu_info[2]), "=d"(cpu_info[3])
-    : "a"(info_type));
-}
-#elif defined(__i386__) || defined(__x86_64__)
-static __inline void __cpuid(int cpu_info[4], int info_type) {
-  asm volatile (
-    "cpuid                                     \n"
-    : "=a"(cpu_info[0]), "=b"(cpu_info[1]), "=c"(cpu_info[2]), "=d"(cpu_info[3])
-    : "a"(info_type));
-}
-#endif
-
 #ifdef __cplusplus
 namespace libyuv {
 extern "C" {
@@ -68,6 +45,9 @@ static __inline int TestCpuFlag(int test_flag) {
 // MaskCpuFlags(0) to re-initialize all cpu detection.
 void MaskCpuFlags(int enable_flags);
 
+// Low level cpuid for X86.  Returns zeros on other CPUs.
+void CpuId(int cpu_info[4], int info_type);
+
 #ifdef __cplusplus
 }  // extern "C"
 }  // namespace libyuv

include/libyuv/version.h

@@ -11,7 +11,7 @@
 #ifndef INCLUDE_LIBYUV_VERSION_H_
 #define INCLUDE_LIBYUV_VERSION_H_
 
-#define LIBYUV_VERSION 258
+#define LIBYUV_VERSION 259
 
 #endif  // INCLUDE_LIBYUV_VERSION_H_
 

source/cpu_id.cc

@@ -10,6 +10,10 @@
 
 #include "libyuv/cpu_id.h"
 
+#ifdef _MSC_VER
+#include <intrin.h>  // For __cpuid()
+#endif
+
 #include <stdlib.h>  // For getenv()
 
 // For ArmCpuCaps() but unittested on all platforms
@@ -18,11 +22,40 @@
 
 #include "libyuv/basic_types.h"  // For CPU_X86
 
+// TODO(fbarchard): Use cpuid.h when gcc 4.4 is used on OSX and Linux.
+#if (defined(__pic__) || defined(__APPLE__)) && defined(__i386__)
+static __inline void __cpuid(int cpu_info[4], int info_type) {
+  asm volatile (
+    "mov %%ebx, %%edi                          \n"
+    "cpuid                                     \n"
+    "xchg %%edi, %%ebx                         \n"
+    : "=a"(cpu_info[0]), "=D"(cpu_info[1]), "=c"(cpu_info[2]), "=d"(cpu_info[3])
+    : "a"(info_type));
+}
+#elif defined(__i386__) || defined(__x86_64__)
+static __inline void __cpuid(int cpu_info[4], int info_type) {
+  asm volatile (
+    "cpuid                                     \n"
+    : "=a"(cpu_info[0]), "=b"(cpu_info[1]), "=c"(cpu_info[2]), "=d"(cpu_info[3])
+    : "a"(info_type));
+}
+#endif
+
 #ifdef __cplusplus
 namespace libyuv {
 extern "C" {
 #endif
 
+// Low level cpuid for X86.  Returns zeros on other CPUs.
+void CpuId(int cpu_info[4], int info_type) {
+#if defined(__i386__) || defined(__x86_64__) || \
+    defined(_M_IX86) || defined(_M_X64)
+    __cpuid(cpu_info, info_type);
+#else
+    cpu_info[0] = cpu_info[1] = cpu_info[2] = cpu_info[3] = 0;
+#endif
+}
+
 // based on libvpx arm_cpudetect.c
 // For Arm, but testable on any CPU
 int ArmCpuCaps(const char* cpuinfoname) {

unit_test/cpu_test.cc

@@ -37,30 +37,42 @@ TEST_F(libyuvTest, TestCpuHas) {
   printf("Has NEON %d\n", has_neon);
 }
 
-// Known Vendor IDs are:
-// AuthenticAMD AMD processor
-// CentaurHauls Centaur processor
-// CyrixInstead Cyrix processor
-// GenuineIntel Intel processor
-// GenuineTMx86 Transmeta processor
-// Geode by NSC National Semiconductor processor
-// NexGenDriven NexGen processor
-// RiseRiseRise Rise Technology processor
-// SiS SiS SiS  SiS processor
-// UMC UMC UMC  UMC processor
 #if defined(__i386__) || defined(__x86_64__) || \
     defined(_M_IX86) || defined(_M_X64)
 TEST_F(libyuvTest, TestCpuId) {
   int has_x86 = TestCpuFlag(kCpuHasX86);
   if (has_x86) {
     int cpu_info[4];
-    __cpuid(cpu_info, 0);
+    // Vendor ID:
+    // AuthenticAMD AMD processor
+    // CentaurHauls Centaur processor
+    // CyrixInstead Cyrix processor
+    // GenuineIntel Intel processor
+    // GenuineTMx86 Transmeta processor
+    // Geode by NSC National Semiconductor processor
+    // NexGenDriven NexGen processor
+    // RiseRiseRise Rise Technology processor
+    // SiS SiS SiS  SiS processor
+    // UMC UMC UMC  UMC processor
+    CpuId(cpu_info, 0);
     cpu_info[0] = cpu_info[1];  // Reorder output
     cpu_info[1] = cpu_info[3];
     cpu_info[2] = cpu_info[2];
     cpu_info[3] = 0;
     printf("Cpu Vendor: %s\n", reinterpret_cast<char*>(&cpu_info[0]));
     EXPECT_EQ(12, strlen(reinterpret_cast<char*>(&cpu_info[0])));
+
+    // CPU Family and Model
+    // 3:0 - Stepping
+    // 7:4 - Model
+    // 11:8 - Family
+    // 13:12 - Processor Type
+    // 19:16 - Extended Model
+    // 27:20 - Extended Family
+    CpuId(cpu_info, 1);
+    int family = ((cpu_info[0] >> 8) & 0x0f) | ((cpu_info[0] >> 16) & 0xff0);
+    int model = ((cpu_info[0] >> 4) & 0x0f) | ((cpu_info[0] >> 12) & 0xf0);
+    printf("Cpu Family %d, Model %d\n", family, model);
   }
 }
 #endif