gistfile1.asm

/* array03.s.arm */

.data
.balign 4       // array of 100 integers (4 bytes each)
a: .skip 400 

.balign 4       // struct of 1 char and 1 integer
s: .skip 8      // 8 bytes in total for padding (4-byte aligned)

.text
.global main

// r0 = step
// r1 = addr
main:
    mov r0, #0      // step = 0
    ldr r1, addr_a  // addr = &a
loop:
    cmp r0, #100    // if step == 100
    beq end         // branch to end
    str r0, [r1, +r0, LSL #2]    // *(addr + (step << 2)) = step
    add r0, #1      // step += 1
    b loop
end:
    bx lr           // exit

addr_a: .word a
addr_s: .word s

gistfile2.c

int a[100];
struct si // not used, but included in ARM asm version
{
    char a;
    int b;
};

int main()
{
    int step;

    for (step = 0; step < 100; step++)
    {   
        *(a + step) = step;
    }   
    return step;
}

gistfile3.asm

	.arch armv6
	.eabi_attribute 27, 3
	.eabi_attribute 28, 1
	.fpu vfp
	.eabi_attribute 20, 1
	.eabi_attribute 21, 1
	.eabi_attribute 23, 3
	.eabi_attribute 24, 1
	.eabi_attribute 25, 1
	.eabi_attribute 26, 2
	.eabi_attribute 30, 6
	.eabi_attribute 34, 1
	.eabi_attribute 18, 4
	.file	"test.c"
	.comm	a,400,4
	.text
	.align	2
	.global	main
	.type	main, %function
main:
	@ args = 0, pretend = 0, frame = 8
	@ frame_needed = 1, uses_anonymous_args = 0
	@ link register save eliminated.
	str	fp, [sp, #-4]!
	add	fp, sp, #0
	sub	sp, sp, #12
	mov	r3, #0
	str	r3, [fp, #-8]
	b	.L2
.L3:
	ldr	r3, [fp, #-8]
	mov	r2, r3, asl #2
	ldr	r3, .L5
	add	r3, r2, r3
	ldr	r2, [fp, #-8]
	str	r2, [r3, #0]
	ldr	r3, [fp, #-8]
	add	r3, r3, #1
	str	r3, [fp, #-8]
.L2:
	ldr	r3, [fp, #-8]
	cmp	r3, #99
	ble	.L3
	ldr	r3, [fp, #-8]
	mov	r0, r3
	add	sp, fp, #0
	ldmfd	sp!, {fp}
	bx	lr
.L6:
	.align	2
.L5:
	.word	a
	.size	main, .-main
	.ident	"GCC: (Debian 4.7.2-5+rpi1) 4.7.2"
	.section	.note.GNU-stack,"",%progbits