From 73e3b0034c7147f1232e30082d6fa283d1d453b4 Mon Sep 17 00:00:00 2001
From: Julian Blake Kongslie
Date: Mon, 19 Jul 2021 13:07:45 -0700
Subject: Add unsigned integer multiply instructions.

---
 insts.rb | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

(limited to 'insts.rb')

diff --git a/insts.rb b/insts.rb
index d24a31d..c667896 100644
--- a/insts.rb
+++ b/insts.rb
@@ -169,6 +169,27 @@ inst "rshiftsign $ $" do
   uop { @decode.outaddr_a; @alu.outdata; @rf.store }
 end
 
+inst "mul $ #" do
+  uop { @alu.xor; constaddr(0); @control.outdata }
+  uop { @decode.outdata_b; @counter.load; @control.set_uip_if_zero; constaddr(uip()+4) }
+  uop { @decode.outaddr_a; @rf.outdata; @tmp0.loaddata }
+  mulloop = uip()
+  uop { @counter.decrement; @alu.outdata; @tmp0.outaddr; @alu.add }
+  uop { @counter.outdata; @control.set_uip_if_nonzero; constaddr(mulloop) }
+  uop { @decode.outaddr_a; @alu.outdata; @rf.store }
+end
+
+inst "mul $ $" do
+  uop { @alu.xor; constaddr(0); @control.outdata }
+  uop { @decode.outaddr_a; @rf.outdata; @counter.load }
+  uop { @counter.outdata; @control.set_uip_if_zero; constaddr(uip()+4) }
+  uop { @decode.outaddr_a; @rf.outdata; @tmp0.loaddata }
+  mulloop = uip()
+  uop { @counter.decrement; @alu.outdata; @tmp0.outaddr; @alu.add }
+  uop { @counter.outdata; @control.set_uip_if_nonzero; constaddr(mulloop) }
+  uop { @decode.outaddr_a; @alu.outdata; @rf.store }
+end
+
 def cmpbit(name, bit)
   inst "#{name} $ #" do
     uop { @decode.outaddr_a; @rf.outdata; @tmp0.loaddata }
-- 
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