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+# Multiply Twin Doubleword
+
+XO-Form
+
+* mulxd RT,RA,RB
+
+Pseudo-code:
+
+    prod[0:(XLEN*2)-1] <- MULS((RA), (RB))
+    RT <- prod[XLEN:(XLEN*2)-1]
+
+Special Registers Altered:
+
+    None