Add: save reg in stack on entry of fun | Fix: set right mem_in func in decoder | set right mem_out code | test bench

tb/test_source_code/tb_risc_v_cpu/multiplication.S

@@ -3,61 +3,68 @@
  *  9:s1, 10:a0-7, 18:s2-11, 28:t3-6
  */
 
+li sp, 0
 j test
 
 mult:
+sw a1, 4(sp)
+sw a2, 8(sp)
+addi sp, sp, 8
 li a0, 0
-li a2, 1
+li t0, 1
 mult_loop_start:
-blt t1, a2, mult_loop_end
-and a1, t1, 1
-beq a1, zero, mult_even_compute
-add a0, a0, t2
+blt a1, t0, mult_loop_end
+and t1, a1, 1
+beq t1, zero, mult_even_compute
+add a0, a0, a2
 mult_even_compute:
-add t2, t2, t2
-srl t1, t1, 1
+add a2, a2, a2
+srl a1, a1, 1
 j mult_loop_start
 mult_loop_end:
-jalr ra, t0, 0
+lw a2, 0(sp)
+lw a1, -4(sp)
+addi sp, sp, -8
+jalr ra, ra, 0
 
 test:
-li t1, 0
-li t2, 0
-jal t0, mult
-nop # R[10]=0
-li t1, 0
-li t2, 1
-jal t0, mult
-nop # R[10]=0
-li t1, 1
-li t2, 0
-jal t0, mult
-nop # R[10]=0
-li t1, 1
-li t2, 1
-jal t0, mult
-nop # R[10]=1
-li t1, 2
-li t2, 1
-jal t0, mult
-nop # R[10]=2
-li t1, 1
-li t2, 3
-jal t0, mult
-nop # R[10]=3
-li t1, 2
-li t2, 2
-jal t0, mult
-nop # R[10]=4
-li t1, 2
-li t2, 3
-jal t0, mult
-nop # R[10]=6
-li t1, 5
-li t2, 3
-jal t0, mult
-nop # R[10]=15
-li t1, 5
-li t2, 25
-jal t0, mult
-nop # R[10]=125
+li a1, 0
+li a2, 0
+jal ra, mult
+nop # R[10]=0, R[11]=0, R[12]=0
+li a1, 0
+li a2, 1
+jal ra, mult
+nop # R[10]=0, R[11]=0, R[12]=1
+li a1, 1
+li a2, 0
+jal ra, mult
+nop # R[10]=0, R[11]=1, R[12]=0
+li a1, 1
+li a2, 1
+jal ra, mult
+nop # R[10]=1, R[11]=1, R[12]=1
+li a1, 2
+li a2, 1
+jal ra, mult
+nop # R[10]=2, R[11]=2, R[12]=1
+li a1, 1
+li a2, 3
+jal ra, mult
+nop # R[10]=3, R[11]=1, R[12]=3
+li a1, 2
+li a2, 2
+jal ra, mult
+nop # R[10]=4, R[11]=2, R[12]=2
+li a1, 2
+li a2, 3
+jal ra, mult
+nop # R[10]=6, R[11]=2, R[12]=3
+li a1, 5
+li a2, 3
+jal ra, mult
+nop # R[10]=15, R[11]=5, R[12]=3
+li a1, 5
+li a2, 25
+jal ra, mult
+nop # R[10]=125, R[11]=5, R[12]=25