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- .text
- .align 2
- .globl _start
- _start:
- addi a0, x0, 1123
- addi a1, x0, 5
- nop
- nop
- nop
- jal ra, fast_multiply
- nop
- nop
- nop
- loop:
- jal x0, loop
- nop
- nop
- nop
- fast_multiply:
- add t0, zero, zero # to keep track of result
-
- next_digit:
- andi t1, a1, 1 # is rightmost bit 1?
- srai a1, a1, 1
- nop
- nop
-
- beq t1, zero, skip # if right most bit 0, don't add
- nop
- nop
- nop
- add t0, t0, a0
- skip:
- slli a0, a0, 1 # double first argument
- bne a1, zero, next_digit
- nop
- nop
- nop
- add a0, zero, t0 # move accum result to a0
- jalr x0, ra, 0
- nop
- nop
- nop
- .end _start
- .size _start, .-_start
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