Fix list_cpu_features.exe does not detect SSE42 on Xeon X5650 (Windows) (#220)

src/impl_x86__base_implementation.inl

@@ -246,7 +246,7 @@ typedef struct {
 // These two functions have to be implemented by the OS, that is the file
 // including this file.
 static void OverrideOsPreserves(OsPreserves* os_preserves);
-static void DetectFeaturesFromOs(X86Features* features);
+static void DetectFeaturesFromOs(X86Info* info, X86Features* features);
 
 // Reference https://en.wikipedia.org/wiki/CPUID.
 static void ParseCpuId(const Leaves* leaves, X86Info* info,
@@ -371,7 +371,7 @@ static void ParseCpuId(const Leaves* leaves, X86Info* info,
   } else {
     // When XCR0 is not available (Atom based or older cpus) we need to defer to
     // the OS via custom code.
-    DetectFeaturesFromOs(features);
+    DetectFeaturesFromOs(info, features);
     // Now that we have queried the OS for SSE support, we report this back to
     // os_preserves. This is needed in case of AMD CPU's to enable testing of
     // sse4a (See ParseExtraAMDCpuId below).

src/impl_x86_freebsd.c

@@ -28,7 +28,8 @@ static void OverrideOsPreserves(OsPreserves* os_preserves) {
 #include "internal/stack_line_reader.h"
 #include "internal/string_view.h"
 
-static void DetectFeaturesFromOs(X86Features* features) {
+static void DetectFeaturesFromOs(X86Info* info, X86Features* features) {
+  (void)info;
   // Handling FreeBSD platform through parsing /var/run/dmesg.boot.
   const int fd = CpuFeatures_OpenFile("/var/run/dmesg.boot");
   if (fd >= 0) {

src/impl_x86_linux_or_android.c

@@ -27,7 +27,8 @@ static void OverrideOsPreserves(OsPreserves* os_preserves) {
 #include "internal/filesystem.h"
 #include "internal/stack_line_reader.h"
 #include "internal/string_view.h"
-static void DetectFeaturesFromOs(X86Features* features) {
+static void DetectFeaturesFromOs(X86Info* info, X86Features* features) {
+  (void)info;
   // Handling Linux platform through /proc/cpuinfo.
   const int fd = CpuFeatures_OpenFile("/proc/cpuinfo");
   if (fd >= 0) {

src/impl_x86_macos.c

@@ -42,7 +42,8 @@ static void OverrideOsPreserves(OsPreserves* os_preserves) {
   os_preserves->avx512_registers = GetDarwinSysCtlByName("hw.optional.avx512f");
 }
 
-static void DetectFeaturesFromOs(X86Features* features) {
+static void DetectFeaturesFromOs(X86Info* info, X86Features* features) {
+  (void)info;
   // Handling Darwin platform through sysctlbyname.
   features->sse = GetDarwinSysCtlByName("hw.optional.sse");
   features->sse2 = GetDarwinSysCtlByName("hw.optional.sse2");

src/impl_x86_windows.c

@@ -34,7 +34,7 @@ static bool GetWindowsIsProcessorFeaturePresent(DWORD ProcessorFeature) {
 }
 #endif
 
-static void DetectFeaturesFromOs(X86Features* features) {
+static void DetectFeaturesFromOs(X86Info* info, X86Features* features) {
   // Handling Windows platform through IsProcessorFeaturePresent.
   // https://docs.microsoft.com/en-us/windows/win32/api/processthreadsapi/nf-processthreadsapi-isprocessorfeaturepresent
   features->sse =
@@ -43,6 +43,15 @@ static void DetectFeaturesFromOs(X86Features* features) {
       GetWindowsIsProcessorFeaturePresent(PF_XMMI64_INSTRUCTIONS_AVAILABLE);
   features->sse3 =
       GetWindowsIsProcessorFeaturePresent(PF_SSE3_INSTRUCTIONS_AVAILABLE);
+
+// https://github.com/google/cpu_features/issues/200
+#if (_WIN32_WINNT >= 0x0601)  // Win7+
+  if (GetX86Microarchitecture(info) == INTEL_WSM) {
+    features->ssse3 = true;
+    features->sse4_1 = true;
+    features->sse4_2 = true;
+  }
+#endif
 }
 
 #endif  // CPU_FEATURES_OS_WINDOWS

test/cpuinfo_x86_test.cc

@@ -1117,6 +1117,32 @@ TEST_F(CpuidX86Test, INTEL_KNIGHTS_LANDING) {
             X86Microarchitecture::INTEL_KNIGHTS_L);
 }
 
+// https://github.com/google/cpu_features/issues/200
+// http://users.atw.hu/instlatx64/GenuineIntel/GenuineIntel00206F2_Eagleton_CPUID.txt
+#if defined(CPU_FEATURES_OS_WINDOWS)
+TEST_F(CpuidX86Test, WIN_INTEL_WESTMERE_EX) {
+  cpu().SetLeaves({
+      {{0x00000000, 0}, Leaf{0x0000000B, 0x756E6547, 0x6C65746E, 0x49656E69}},
+      {{0x00000001, 0}, Leaf{0x000206F2, 0x00400800, 0x02BEE3FF, 0xBFEBFBFF}},
+  });
+  const auto info = GetX86Info();
+
+  EXPECT_EQ(info.family, 0x06);
+  EXPECT_EQ(info.model, 0x2F);
+  EXPECT_EQ(GetX86Microarchitecture(&info), X86Microarchitecture::INTEL_WSM);
+
+#if (_WIN32_WINNT < 0x0601)  // before Win7
+  EXPECT_FALSE(info.features.ssse3);
+  EXPECT_FALSE(info.features.sse4_1);
+  EXPECT_FALSE(info.features.sse4_2);
+#else
+  EXPECT_TRUE(info.features.ssse3);
+  EXPECT_TRUE(info.features.sse4_1);
+  EXPECT_TRUE(info.features.sse4_2);
+#endif
+}
+#endif  // CPU_FEATURES_OS_WINDOWS
+
 // TODO(user): test what happens when xsave/osxsave are not present.
 // TODO(user): test what happens when xmm/ymm/zmm os support are not
 // present.