Updating xarch to utilize EVEX compares and blending where profitable

Author: tannergooding

src/coreclr/jit/gentree.cpp

@@ -29536,42 +29536,9 @@ var_types GenTreeHWIntrinsic::GetLookupTypeForCmpOp(
     var_types lookupType = type;
 
 #if defined(TARGET_XARCH)
-    switch (oper)
+    if (comp->canUseEvexEncoding())
     {
-        case GT_EQ:
-        {
-            if (simdSize == 64)
-            {
-                lookupType = TYP_MASK;
-            }
-            break;
-        }
-
-        case GT_GE:
-        case GT_LE:
-        case GT_NE:
-        {
-            if ((simdSize == 64) || (varTypeIsIntegral(simdBaseType) && comp->canUseEvexEncoding()))
-            {
-                lookupType = TYP_MASK;
-            }
-            break;
-        }
-
-        case GT_GT:
-        case GT_LT:
-        {
-            if ((simdSize == 64) || (varTypeIsUnsigned(simdBaseType) && comp->canUseEvexEncoding()))
-            {
-                lookupType = TYP_MASK;
-            }
-            break;
-        }
-
-        default:
-        {
-            unreached();
-        }
+        lookupType = TYP_MASK;
     }
 #endif // TARGET_XARCH
 

src/coreclr/jit/hwintrinsic.h

@@ -546,12 +546,11 @@ struct HWIntrinsicInfo
     static bool isScalarIsa(CORINFO_InstructionSet isa);
 
 #ifdef TARGET_XARCH
-    static bool                isAVX2GatherIntrinsic(NamedIntrinsic id);
-    static FloatComparisonMode lookupFloatComparisonModeForSwappedArgs(FloatComparisonMode comparison);
-    static NamedIntrinsic      lookupIdForFloatComparisonMode(NamedIntrinsic      intrinsic,
-                                                              FloatComparisonMode comparison,
-                                                              var_types           simdBaseType,
-                                                              unsigned            simdSize);
+    static bool           isAVX2GatherIntrinsic(NamedIntrinsic id);
+    static NamedIntrinsic lookupIdForFloatComparisonMode(NamedIntrinsic      intrinsic,
+                                                         FloatComparisonMode comparison,
+                                                         var_types           simdBaseType,
+                                                         unsigned            simdSize);
 #endif
 
     // Member lookup