# Lab 6 **Name:** **G.NISHCHITH** **Roll No.:** **CS22B021** ## Question 11 & 12 Given to get assembly code for the above c code by using **riscv-none-elf-gcc -march=rv32i -mabi=ilp32 -S test.c -o test.s** Here is the screenshot of assembly code. ![Screenshot from 2024-03-26 14-53-41](https://hackmd.io/_uploads/r1gb8LlkC.png) --- ## Question 13 We can optimize the given codes by using optimization levels while compiling the codes. --- ## Question 14 The elf file is uploaded in the drive link https://drive.google.com/drive/folders/1ONFNCZ2BPP73eqvCERSLwjcSXnoOJakl?usp=sharing --- ## Question 15 Given to optimize the codes and check their sizes The commands are **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** test_o0.s ```assembly= .file "a.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) addi a4,a5,1 lw a5,-24(s0) slli a5,a5,2 addi a5,a5,-16 add a5,a5,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" ``` test_o1.s ```assembly= .file "a.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" ``` test_o2.s ```assembly= .file "a.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" ``` test_o3.s ```assembly= .file "a.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" ``` test_os.s ```assembly= .file "a.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" ``` test_ofast.s ```assembly= .file "a.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" ``` ![Screenshot from 2024-03-26 14-56-32](https://hackmd.io/_uploads/SkaFw8lyA.png)