Update instruction table to capture the correct state of EFlags

src/coreclr/jit/emitxarch.cpp

@@ -161,7 +161,7 @@ bool emitter::IsDstSrcSrcAVXInstruction(instruction ins)
 //
 bool emitter::DoesWriteZeroFlag(instruction ins)
 {
-    return (CodeGenInterface::instInfo[ins] & INS_FLAGS_WritesZF) != 0;
+    return (CodeGenInterface::instInfo[ins] & Writes_ZF) != 0;
 }
 
 //------------------------------------------------------------------------
@@ -176,7 +176,7 @@ bool emitter::DoesWriteZeroFlag(instruction ins)
 //
 bool emitter::DoesResetOverflowAndCarryFlags(instruction ins)
 {
-    return (CodeGenInterface::instInfo[ins] & INS_FLAGS_Resets_CF_OF_Flags) != 0;
+    return (CodeGenInterface::instInfo[ins] & (Resets_OF | Resets_CF)) != 0;
 }
 
 //------------------------------------------------------------------------

src/coreclr/jit/instr.h

@@ -86,52 +86,56 @@ enum GCtype : unsigned
 };
 
 #if defined(TARGET_XARCH)
+
 enum insFlags : uint32_t
 {
     INS_FLAGS_None = 0,
 
-    // Reads EFLAGS
-    INS_FLAGS_ReadsCF = 1 << 0,
-    INS_FLAGS_ReadsPF = 1 << 1,
-    INS_FLAGS_ReadsAF = 1 << 2,
-    INS_FLAGS_ReadsZF = 1 << 3,
-    INS_FLAGS_ReadsSF = 1 << 4,
-    INS_FLAGS_ReadsDF = 1 << 5,
-    INS_FLAGS_ReadsOF = 1 << 6,
-    INS_FLAGS_ReadsAllFlagsExceptAF = INS_FLAGS_ReadsCF | INS_FLAGS_ReadsPF | INS_FLAGS_ReadsZF | INS_FLAGS_ReadsSF | INS_FLAGS_ReadsOF,
-    INS_FLAGS_Reads_CF_ZF_Flags = INS_FLAGS_ReadsCF | INS_FLAGS_ReadsZF,
-    INS_FLAGS_Reads_OF_SF_Flags = INS_FLAGS_ReadsOF | INS_FLAGS_ReadsSF,
-    INS_FLAGS_Reads_OF_SF_ZF_Flags = INS_FLAGS_ReadsOF | INS_FLAGS_ReadsSF | INS_FLAGS_ReadsZF,
-    INS_FLAGS_ReadsAllFlags = INS_FLAGS_ReadsAF | INS_FLAGS_ReadsAllFlagsExceptAF,
-
-    // Writes EFLAGS
-    INS_FLAGS_WritesCF = 1 << 7,
-    INS_FLAGS_WritesPF = 1 << 8,
-    INS_FLAGS_WritesAF = 1 << 9,
-    INS_FLAGS_WritesZF = 1 << 10,
-    INS_FLAGS_WritesSF = 1 << 11,
-    INS_FLAGS_WritesDF = 1 << 12,
-    INS_FLAGS_WritesOF = 1 << 13,
-    INS_FLAGS_WritesAllFlagsExceptCF = INS_FLAGS_WritesPF | INS_FLAGS_WritesAF | INS_FLAGS_WritesZF | INS_FLAGS_WritesSF | INS_FLAGS_WritesOF,
-    INS_FLAGS_WritesAllFlagsExceptOF = INS_FLAGS_WritesCF | INS_FLAGS_WritesPF | INS_FLAGS_WritesAF | INS_FLAGS_WritesZF | INS_FLAGS_WritesSF,
-    INS_FLAGS_WritesAllFlags = INS_FLAGS_WritesCF | INS_FLAGS_WritesAllFlagsExceptCF,
-
-    // Resets EFLAGS
-    INS_FLAGS_Resets_OF_Flags       = 1 << 14,
-    INS_FLAGS_Resets_CF_OF_Flags    = 1 << 15,
-    INS_FLAGS_Resets_OF_SF_PF_Flags = 1 << 16,
-    INS_FLAGS_ResetsAllFlagsExceptZF = 1 << 17,
+    // Reads
+    Reads_OF = 1 << 0,
+    Reads_SF = 1 << 1,
+    Reads_ZF = 1 << 2,
+    Reads_PF = 1 << 3,
+    Reads_CF = 1 << 4,
+    Reads_DF = 1 << 5,
+
+    // Writes
+    Writes_OF = 1 << 6,
+    Writes_SF = 1 << 7,
+    Writes_ZF = 1 << 8,
+    Writes_AF = 1 << 9,
+    Writes_PF = 1 << 10,
+    Writes_CF = 1 << 11,
+
+    // Resets
+    Resets_OF = 1 << 12,
+    Resets_SF = 1 << 13,
+    Resets_AF = 1 << 14,
+    Resets_PF = 1 << 15,
+    Resets_CF = 1 << 16,
+
+    // Undefined
+    Undefined_OF = 1 << 17,
+    Undefined_SF = 1 << 18,
+    Undefined_ZF = 1 << 19,
+    Undefined_AF = 1 << 20,
+    Undefined_PF = 1 << 21,
+    Undefined_CF = 1 << 22,
+
+    // Restore
+    Restore_SF_ZF_AF_PF_CF = 1 << 23,
 
     // x87 instruction
-    INS_FLAGS_x87Instr = 1 << 18,
+    INS_FLAGS_x87Instr = 1 << 24,
 
     // Avx
-    INS_Flags_IsDstDstSrcAVXInstruction = 1 << 19,
-    INS_Flags_IsDstSrcSrcAVXInstruction = 1 << 20,
+    INS_Flags_IsDstDstSrcAVXInstruction = 1 << 25,
+    INS_Flags_IsDstSrcSrcAVXInstruction = 1 << 26,
 
     //  TODO-Cleanup:  Remove this flag and its usage from TARGET_XARCH
     INS_FLAGS_DONT_CARE = 0x00,
 };
+
 #elif defined(TARGET_ARM) || defined(TARGET_ARM64)
 // TODO-Cleanup: Move 'insFlags' under TARGET_ARM
 enum insFlags: unsigned