# Lab 6
Name: Guru Rohith.G
Roll No.: CS22B022

---
## Question 11

.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	ra,428(sp)
	sw	s0,424(sp)
	addi	s0,sp,432
	addi	a5,s0,-424
	li	a4,400
	mv	a2,a4
	li	a1,0
	mv	a0,a5
	call	memset
	li	a5,1
	sw	a5,-424(s0)
	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	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	ra,428(sp)
	lw	s0,424(sp)
	addi	sp,sp,432
	jr	ra
	.size	main, .-main
	.ident	"GCC: (xPack GNU RISC-V Embedded GCC x86_64) 13.2.0"

---
## Question 12
### Code

.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	ra,428(sp)
	sw	s0,424(sp)
	addi	s0,sp,432
	addi	a5,s0,-424
	li	a4,400
	mv	a2,a4
	li	a1,0
	mv	a0,a5
	call	memset
	li	a5,1
	sw	a5,-424(s0)
	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	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	ra,428(sp)
	lw	s0,424(sp)
	addi	sp,sp,432
	jr	ra
	.size	main, .-main
	.ident	"GCC: (xPack GNU RISC-V Embedded GCC x86_64) 13.2.0"

---
## Question 13
Yes we can optimize by using different optimizers and compile it.
So we can use o0, o1, o2 , 03, os, ofast.

## Question 14

elf file:
https://drive.google.com/file/d/1yT6xfOiZZkdL3lZoFIni0DRLoqXyN811/view?usp=sharing
## Question 15
### Code
#### Using:
(riscv-none-elf-gcc -march=rv32i -mabi=ilp32 -O0 -S test.c -o test_o0.s)

.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	ra,428(sp)
	sw	s0,424(sp)
	addi	s0,sp,432
	addi	a5,s0,-424
	li	a4,400
	mv	a2,a4
	li	a1,0
	mv	a0,a5
	call	memset
	li	a5,1
	sw	a5,-424(s0)
	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	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	ra,428(sp)
	lw	s0,424(sp)
	addi	sp,sp,432
	jr	ra
	.size	main, .-main
	.ident	"GCC: (xPack GNU RISC-V Embedded GCC x86_64) 13.2.0"

#### Using:
risv-none-elf-gcc -march=rv32i -mabi=ilp32 -O1 -S test.c -o test_o1.s
### Code

.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"

#### using:
risv-none-elf-gcc -march=rv32i -mabi=ilp32 -O2 -S test.c -o test_o2.s
### Code

.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"

#### Uisng:
risv-none-elf-gcc -march=rv32i -mabi=ilp32 -O3 -S test.c -o test_o3.s
### Code:

.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"

#### Using:
( riscv-none-elf-gcc -march=rv32i -mabi=ilp32 -Os -S test.c -o test_os.s)
### Code:

.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"

#### Using:
(riscv-none-elf-gcc -march=rv32i -mabi=ilp32 -Ofast -S test.c -o test_ofast.s)
### Code:

	.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"

| Optimizer| size| Runtime |
| -------- | -------- | -------- |
| o0 | 744 bytes | 0.000003 sec |
o1 | 322 bytes | 0.000002 sec|
o2 | 313 bytes | 0.000002 sec|
o3|313 bytes| 0.000002 sec|
os| 313 bytes| 0.000002 sec|
ofast|313 bytes|0.000002 sec|