Delete dead code to support OSes prior to Windows 7 (#17367)

2 files changed, 1 insertions, 70 deletions

diff --git a/src/vm/i386/cgencpu.h b/src/vm/i386/cgencpu.h
index ffdfb82b14..f1bdd0f73f 100644
--- a/src/vm/i386/cgencpu.h
+++ b/src/vm/i386/cgencpu.h
@@ -44,8 +44,6 @@ EXTERN_C void STDCALL PInvokeStackImbalanceHelper(void);
 EXTERN_C void SinglecastDelegateInvokeStub();
 #endif // FEATURE_STUBS_AS_IL
 
-BOOL Runtime_Test_For_SSE2();
-
 #ifdef CROSSGEN_COMPILE
 #define GetEEFuncEntryPoint(pfn) 0x1001
 #else
@@ -61,7 +59,7 @@ BOOL Runtime_Test_For_SSE2();
 // #define CPU_X86_STEPPING(cpuType)   (((cpuType) & 0x000F)     )
 
 #define CPU_X86_USE_CMOV(cpuFeat)   ((cpuFeat & 0x00008001) == 0x00008001)
-#define CPU_X86_USE_SSE2(cpuFeat)  (((cpuFeat & 0x04000000) == 0x04000000) && Runtime_Test_For_SSE2())
+#define CPU_X86_USE_SSE2(cpuFeat)   ((cpuFeat & 0x04000000) == 0x04000000)
 
 // Values for CPU_X86_FAMILY(cpuType)
 #define CPU_X86_486                 4
diff --git a/src/vm/i386/cgenx86.cpp b/src/vm/i386/cgenx86.cpp
index 492cec4668..e222607a60 100644
--- a/src/vm/i386/cgenx86.cpp
+++ b/src/vm/i386/cgenx86.cpp
@@ -84,73 +84,6 @@ void ClearRegDisplayArgumentAndScratchRegisters(REGDISPLAY * pRD)
 
 #ifndef DACCESS_COMPILE
 
-//=============================================================================
-// Runtime test to see if the OS has enabled support for the SSE2 instructions
-//
-//
-BOOL Runtime_Test_For_SSE2()
-{
-#ifdef FEATURE_CORESYSTEM
-    return TRUE;
-#else
-
-    BOOL result = IsProcessorFeaturePresent(PF_XMMI64_INSTRUCTIONS_AVAILABLE);
-
-    if (result == FALSE)
-        return FALSE;
-
-    // **********************************************************************
-    // ***                                                                ***
-    // ***   IMPORTANT NOTE:                                              ***
-    // ***                                                                ***
-    // ***     All of these RunningOnXXX APIs return true when            ***
-    // ***     the OS that you are running on is that OS or later.        ***
-    // ***     For example RunningOnWin2003() will return true            ***
-    // ***     when you are running on Win2k3, Vista, Win7 or later.      ***
-    // ***                                                                ***
-    // **********************************************************************
-
-
-    // Windows 7 and later should alwys be using SSE2 instructions
-    //  this is true for both for native and Wow64
-    //
-    if (RunningOnWin7())
-        return TRUE;
-
-    if (RunningInWow64())
-    {
-        // There is an issue with saving/restoring the SSE2 registers under wow64 
-        // So we figure out if we are running on an impacted OS and Service Pack level
-        //     See DevDiv Bugs 89587 for the wow64 bug.
-        //
-
-        _ASSERTE(ExOSInfoAvailable());  // This is always available on Vista and later
-
-        //
-        // The issue is fixed in Windows Server 2008 or Vista/SP1
-        //
-        // It is not fixed in Vista/RTM, so check for that case
-        // 
-        if ((ExOSInfoRunningOnServer() == FALSE))
-        {
-            OSVERSIONINFOEX osvi;
-
-            ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
-            osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
-            osvi.wServicePackMajor = 0;
-
-            DWORDLONG dwlConditionMask = 0;
-            VER_SET_CONDITION( dwlConditionMask, CLR_VER_SERVICEPACKMAJOR, VER_EQUAL);
-                
-            if (VerifyVersionInfo(&osvi, CLR_VER_SERVICEPACKMAJOR, dwlConditionMask))
-                result = FALSE;
-        }
-    }
-
-    return result;
-#endif
-}
-
 //---------------------------------------------------------------
 // Returns the type of CPU (the value of x of x86)
 // (Please note, that it returns 6 for P5-II)