[clang] [X86][Clang] Add AVX512 Integer Comparison Intrinsics for constexpr Evaluation (PR #164026)

[Simon Pilgrim via cfe-commits]

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@@ -3101,6 +3101,61 @@ static bool interp__builtin_vec_set(InterpState &S, CodePtr OpPC,
   return true;
 }
 
+static bool evalICmpImm(const uint8_t imm, APSInt A, APSInt B,
+                        bool IsUnsigned) {
+  switch (imm & 0x7) {
+  case 0x00: // _MM_CMPINT_EQ
+    return (A == B);
+  case 0x01: // _MM_CMPINT_LT
+    return IsUnsigned ? A.ult(B) : A.slt(B);
+  case 0x02: // _MM_CMPINT_LE
+    return IsUnsigned ? A.ule(B) : A.sle(B);
+  case 0x03: // _MM_CMPINT_FALSE
+    return false;
+  case 0x04: // _MM_CMPINT_NE
+    return (A != B);
+  case 0x05: // _MM_CMPINT_NLT
+    return IsUnsigned ? A.ugt(B) : A.sgt(B);
+  case 0x06: // _MM_CMPINT_NLE
+    return IsUnsigned ? A.uge(B) : A.sge(B);
+  case 0x07: // _MM_CMPINT_TRUE
+    return true;
+  default:
+    llvm_unreachable("Invalid Op");
+  }
+}
+
+static bool interp__builtin_cmp_mask(InterpState &S, CodePtr OpPC,
----------------
RKSimon wrote:

interp__builtin_cmp_mask -> interp__builtin_ia32_cmp_mask

https://github.com/llvm/llvm-project/pull/164026