# Computer Organisation Lab # LAB-6 ### Test File ```C= #include <stdio.h> int main(){ int sum=0; int a[100]; for(int i=0;i<100;i++){ a[i]=i; sum+=a[i]; } return 0; } ``` ### Commands Executed ``` riscv-none-elf-gcc -march=rv32i -mabi=ilp32 -o test.elf test.c riscv-none-elf-readelf -a test.elf riscv-none-elf-size test.elf riscv-none-elf-gcc -march=rv32i -mabi=ilp32 -S test.c -o test.s riscv-none-elf-gcc -march=rv32i -mabi=ilp32 -o test.elf test.s riscv-none-elf-gcc -march=rv32i -mabi=ilp32 -O0 -S test.c -o test_o0.s risv-none-elf-gcc -march=rv32i -mabi=ilp32 -O1 -S test.c -o test_o1.s risv-none-elf-gcc -march=rv32i -mabi=ilp32 -O2 -S test.c -o test_o2.s risv-none-elf-gcc -march=rv32i -mabi=ilp32 -O3 -S test.c -o test_o3.s riscv-none-elf-gcc -march=rv32i -mabi=ilp32 -Os -S test.c -o test_os.s riscv-none-elf-gcc -march=rv32i -mabi=ilp32 -Ofast -S test.c -o test_ofast.s ``` ### Without Optimisation(O0 Optimisation) ```assembly= .file "test.c" .option nopic .attribute arch, "rv32i2p1" .attribute unaligned_access, 0 .attribute stack_align, 16 .text .align 2 .globl main .type main, @function main: addi sp,sp,-432 sw s0,428(sp) addi s0,sp,432 sw zero,-20(s0) sw zero,-24(s0) j .L2 .L3: lw a5,-24(s0) slli a5,a5,2 addi a5,a5,-16 add a5,a5,s0 lw a4,-24(s0) sw a4,-408(a5) lw a5,-24(s0) slli a5,a5,2 addi a5,a5,-16 add a5,a5,s0 lw a5,-408(a5) lw a4,-20(s0) add a5,a4,a5 sw a5,-20(s0) lw a5,-24(s0) addi a5,a5,1 sw a5,-24(s0) .L2: lw a4,-24(s0) li a5,99 ble a4,a5,.L3 li a5,0 mv a0,a5 lw s0,428(sp) addi sp,sp,432 jr ra .size main, .-main .ident "GCC: (xPack GNU RISC-V Embedded GCC x86_64) 13.2.0" ``` ``` text data bss dec hex filename 8608 1372 840 10820 2a44 test.elf ``` ``` Time(in seconds) : 0.000001 ``` --- ### O1 Optimisation ```assembly= .file "test.c" .option nopic .attribute arch, "rv32i2p1" .attribute unaligned_access, 0 .attribute stack_align, 16 .text .align 2 .globl main .type main, @function main: li a5,100 .L2: addi a5,a5,-1 bne a5,zero,.L2 li a0,0 ret .size main, .-main .ident "GCC: (xPack GNU RISC-V Embedded GCC x86_64) 13.2.0" ``` ``` text data bss dec hex filename 8620 1372 840 10832 2a50 test.elf ``` ``` Time(in seconds) : 0.000002 ``` ### O2 Optimisation ```assembly= .file "test.c" .option nopic .attribute arch, "rv32i2p1" .attribute unaligned_access, 0 .attribute stack_align, 16 .text .section .text.startup,"ax",@progbits .align 2 .globl main .type main, @function main: li a0,0 ret .size main, .-main .ident "GCC: (xPack GNU RISC-V Embedded GCC x86_64) 13.2.0" ``` ``` text data bss dec hex filename 8608 1372 840 10820 2a44 test.elf ``` ``` Time(in seconds) : 0.000002 ``` ### O3 Optimisation ```assembly= .file "test.c" .option nopic .attribute arch, "rv32i2p1" .attribute unaligned_access, 0 .attribute stack_align, 16 .text .section .text.startup,"ax",@progbits .align 2 .globl main .type main, @function main: li a0,0 ret .size main, .-main .ident "GCC: (xPack GNU RISC-V Embedded GCC x86_64) 13.2.0" ``` ``` text data bss dec hex filename 8608 1372 840 10820 2a44 test.elf ``` ``` Time(in seconds) : 0.000001 ``` ### OS Optimisation ```assembly= .file "test.c" .option nopic .attribute arch, "rv32i2p1" .attribute unaligned_access, 0 .attribute stack_align, 16 .text .section .text.startup,"ax",@progbits .align 2 .globl main .type main, @function main: li a0,0 ret .size main, .-main .ident "GCC: (xPack GNU RISC-V Embedded GCC x86_64) 13.2.0" ``` ``` text data bss dec hex filename 8608 1372 840 10820 2a44 test.elf ``` ``` Time(in seconds) : 0.000002 ``` ### Ofast Optimisation ```assembly= .file "test.c" .option nopic .attribute arch, "rv32i2p1" .attribute unaligned_access, 0 .attribute stack_align, 16 .text .section .text.startup,"ax",@progbits .align 2 .globl main .type main, @function main: li a0,0 ret .size main, .-main .ident "GCC: (xPack GNU RISC-V Embedded GCC x86_64) 13.2.0" ``` ``` text data bss dec hex filename 8608 1372 840 10820 2a44 test.el ``` ``` Time(in seconds) : 0.000002 ```