Add APX knob

Author: DeepakRajendrakumaran

src/coreclr/jit/compiler.h

@@ -9887,6 +9887,12 @@ class Compiler
     //
     bool canUseApxEncoding() const
     {
+#ifdef DEBUG
+        if (JitConfig.JitBypassApxCheck())
+        {
+            return true;
+        }
+#endif
         return compOpportunisticallyDependsOn(InstructionSet_APX);
     }
 

src/coreclr/jit/jitconfigvalues.h

@@ -374,6 +374,7 @@ RELEASE_CONFIG_INTEGER(JitNoInline, "JitNoInline", 0)
 
 #if defined(DEBUG)
 CONFIG_INTEGER(JitStressRex2Encoding, "JitStressRex2Encoding", 0) // Enable rex2 encoding for compatible instructions.
+CONFIG_INTEGER(JitBypassApxCheck, "JitBypassApxCheck", 0)
 CONFIG_INTEGER(JitStressPromotedEvexEncoding, "JitStressPromotedEvexEncoding", 0) // Enable promoted EVEX encoding for
                                                                                   // compatible instructions.
 #endif
@@ -449,6 +450,7 @@ RELEASE_CONFIG_INTEGER(EnableEmbeddedBroadcast,     "EnableEmbeddedBroadcast",
 RELEASE_CONFIG_INTEGER(EnableEmbeddedMasking,       "EnableEmbeddedMasking",     1) // Allows embedded masking to be disabled
 RELEASE_CONFIG_INTEGER(EnableApxNDD,                "EnableApxNDD",              0) // Allows APX NDD feature to be disabled
 RELEASE_CONFIG_INTEGER(EnableApxConditionalChaining, "EnableApxConditionalChaining",        0) // Allows APX conditional compare chaining
+RELEASE_CONFIG_INTEGER(EnableApxPPX,                "EnableApxPPX",              0) // Allows APX PPX feature to be disabled
 
 // clang-format on