diff --git a/src/dynarmic/backend/x64/constants.h b/src/dynarmic/backend/x64/constants.h
index c2cce2f9..0316cebc 100644
--- a/src/dynarmic/backend/x64/constants.h
+++ b/src/dynarmic/backend/x64/constants.h
@@ -13,6 +13,42 @@
 
 namespace Dynarmic::Backend::X64 {
 
+// Redefinition of _MM_CMP_* constants for use with the 'vcmp' instruction
+namespace Cmp {
+constexpr u8 Equal_OQ = 0;             // Equal (Quiet, Ordered).
+constexpr u8 LessThan_OS = 1;          // Less (Signaling, Ordered).
+constexpr u8 LessEqual_OS = 2;         // Less/Equal (Signaling, Ordered).
+constexpr u8 Unordered_Q = 3;          // Unordered (Quiet).
+constexpr u8 NotEqual_UQ = 4;          // Not Equal (Quiet, Unordered).
+constexpr u8 NotLessThan_US = 5;       // Not Less (Signaling, Unordered).
+constexpr u8 NotLessEqual_US = 6;      // Not Less/Equal (Signaling, Unordered).
+constexpr u8 Ordered_Q = 7;            // Ordered (Quiet).
+constexpr u8 Equal_UQ = 8;             // Equal (Quiet, Unordered).
+constexpr u8 NotGreaterEqual_US = 9;   // Not Greater/Equal (Signaling, Unordered).
+constexpr u8 NotGreaterThan_US = 10;   // Not Greater (Signaling, Unordered).
+constexpr u8 False_OQ = 11;            // False (Quiet, Ordered).
+constexpr u8 NotEqual_OQ = 12;         // Not Equal (Quiet, Ordered).
+constexpr u8 GreaterEqual_OS = 13;     // Greater/Equal (Signaling, Ordered).
+constexpr u8 GreaterThan_OS = 14;      // Greater (Signaling, Ordered).
+constexpr u8 True_UQ = 15;             // True (Quiet, Unordered).
+constexpr u8 Equal_OS = 16;            // Equal (Signaling, Ordered).
+constexpr u8 LessThan_OQ = 17;         // Less (Quiet, Ordered).
+constexpr u8 LessEqual_OQ = 18;        // Less/Equal (Quiet, Ordered).
+constexpr u8 Unordered_S = 19;         // Unordered (Signaling).
+constexpr u8 NotEqual_US = 20;         // Not Equal (Signaling, Unordered).
+constexpr u8 NotLessThan_UQ = 21;      // Not Less (Quiet, Unordered).
+constexpr u8 NotLessEqual_UQ = 22;     // Not Less/Equal (Quiet, Unordered).
+constexpr u8 Ordered_S = 23;           // Ordered (Signaling).
+constexpr u8 Equal_US = 24;            // Equal (Signaling, Unordered).
+constexpr u8 NotGreaterEqual_UQ = 25;  // Not Greater/Equal (Quiet, Unordered).
+constexpr u8 NotGreaterThan_UQ = 26;   // Not Greater (Quiet, Unordered).
+constexpr u8 False_OS = 27;            // False (Signaling, Ordered).
+constexpr u8 NotEqual_OS = 28;         // Not Equal (Signaling, Ordered).
+constexpr u8 GreaterEqual_OQ = 29;     // Greater/Equal (Quiet, Ordered).
+constexpr u8 GreaterThan_OQ = 30;      // Greater (Quiet, Ordered).
+constexpr u8 True_US = 31;             // True (Signaling, Unordered).
+}  // namespace Cmp
+
 // Redefinition of _MM_CMPINT_* constants for use with the 'vpcmp' instruction
 namespace CmpInt {
 constexpr u8 Equal = 0x0;