Created
October 4, 2016 10:31
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$ riscv64-unknown-elf-gcc -S riscv_fib.c
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| unsigned int fib(unsigned int n) | |
| { | |
| if (n < 2) return n; | |
| else return fib(n - 1) + fib(n - 2); | |
| } |
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| .file "riscv_fib.c" | |
| .option nopic | |
| .text | |
| .align 2 | |
| .globl fib | |
| .type fib, @function | |
| fib: | |
| add sp,sp,-48 | |
| sd ra,40(sp) | |
| sd s0,32(sp) | |
| sd s1,24(sp) | |
| add s0,sp,48 | |
| sw a0,-36(s0) | |
| lw a4,-36(s0) | |
| li a5,1 | |
| bgtu a4,a5,.L2 | |
| lw a5,-36(s0) | |
| j .L3 | |
| .L2: | |
| lw a5,-36(s0) | |
| addw a5,a5,-1 | |
| mv a0,a5 | |
| call fib | |
| mv s1,a0 | |
| lw a5,-36(s0) | |
| addw a5,a5,-2 | |
| mv a0,a5 | |
| call fib | |
| mv a5,a0 | |
| addw a5,s1,a5 | |
| .L3: | |
| mv a0,a5 | |
| ld ra,40(sp) | |
| ld s0,32(sp) | |
| ld s1,24(sp) | |
| add sp,sp,48 | |
| jr ra | |
| .size fib, .-fib | |
| .ident "GCC: (GNU) 6.1.0" |
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