fixed bgeu, bltu and bge in RV32I

riscemu/instructions/RV32I.py

@@ -226,26 +226,26 @@ class RV32I(InstructionSet):
 
     def instruction_bge(self, ins: 'LoadedInstruction'):
         ASSERT_LEN(ins.args, 3)
-        reg1 = ins.get_reg(0)
-        reg2 = ins.get_reg(1)
-        dest = ins.get_imm(2)
-        if self.regs.get(reg1) >= self.regs.get(reg2):
+        reg1 = self.get_reg(ins, 0)
+        reg2 = self.get_reg(ins, 1)
+        dest = self.get_reg(ins, 2)
+        if reg1 >= reg2:
             self.pc = dest
 
     def instruction_bltu(self, ins: 'LoadedInstruction'):
         ASSERT_LEN(ins.args, 3)
-        reg1 = to_unsigned(ins.get_reg(0))
-        reg2 = to_unsigned(ins.get_reg(1))
+        reg1 = self.get_reg(ins, 0)
+        reg2 = self.get_reg(ins, 1)
         dest = ins.get_imm(2)
-        if self.regs.get(reg1) < self.regs.get(reg2):
+        if to_unsigned(reg1) < to_unsigned(reg2):
             self.pc = dest
 
     def instruction_bgeu(self, ins: 'LoadedInstruction'):
         ASSERT_LEN(ins.args, 3)
-        reg1 = to_unsigned(ins.get_reg(0))
-        reg2 = to_unsigned(ins.get_reg(1))
+        reg1 = to_unsigned(self.get_reg(ins, 0))
+        reg2 = to_unsigned(self.get_reg(ins, 1))
         dest = ins.get_imm(2)
-        if self.regs.get(reg1) >= self.regs.get(reg2):
+        if reg1 >= reg2:
             self.pc = dest
 
     # technically deprecated
@@ -292,3 +292,6 @@ class RV32I(InstructionSet):
 
     def instruction_nop(self, ins: 'LoadedInstruction'):
         pass
+
+    def get_reg(self, ins: 'LoadedInstruction', ind: int):
+        return self.regs.get(ins.get_reg(ind))