embedding ARM assembly in C language compile error - c

Question

My assignment is to implement sorting algorithm using C language. I have to make a C code that converts into least number of instructions when compiled by gcc -o0(no optimization option) in ARM machine.
So, My idea is to compile with -o1 option first and embed the compiled assembly directly into my C code.
I succeed in compiling with -o1 option. However, when I compiled the same code with -o0 option, I got a following assembler messages.
Please help me...
user#debian-armel:~gcc -g -O0 mycode4.c -o mycode4
/tmp/cc2Q2Tbh.s: Assembler messages:
/tmp/cc2Q2Tbh.s:77: Warning: destination register same as write-back base
this is my code.
#include <stdio.h>
#include <stdint.h>
#define nMAX 5
#define rMAX 1024
void quickSort(int arr[], int left, int right) {
int* arr0=arr;
int left0=left;
int right0=right;
__asm__ __volatile__(
"quicksort:\n\t"
"push {r4, r5, r6, r7, r8, r9, sl, lr}\n\t"
"mov r5, %0\n\t"
"mov r6, %2\n\t"
"add r3, %1, %2\n\t"
"add r3, r3, r3, lsr #31\n\t"
"asr r3, r3, #1\n\t"
"ldr ip, [%0, r3, lsl #2]\n\t"
"add sl, %0, %1, lsl #2\n\t"
"add r8, %1, #1\n\t"
"b quicksort+0x2c\n\t"
"add r8, r8, #1\n\t"
"sub r4, r8, #1\n\t"
"ldr r9, [sl], #4\n\t"
"cmp ip, r9\n\t"
"bgt quicksort+0x28\n\t"
"add r7, r5, %2, lsl #2\n\t"
"ldr %0, [r5, %2, lsl #2]\n\t"
"cmp ip, %0\n\t"
"bge quicksort+0x68\n\t"
"sub r3, %2, #1\n\t"
"add r3, r5, r3, lsl #2\n\t"
"sub %2, %2, #1\n\t"
"mov r7, r3\n\t"
"ldr %0, [r3], #-4\n\t"
"cmp ip, %0\n\t"
"blt quicksort+0x54\n\t"
"cmp %2, r4\n\t"
"blt quicksort+0x88\n\t"
"str %0, [sl, #-4]\n\t"
"str r9, [r7]\n\t"
"mov r4, r8\n\t"
"sub %2, %2, #1\n\t"
"cmp r8, %2\n\t"
"ble quicksort+0x28\n\t"
"cmp %1, %2\n\t"
"movlt %0, r5\n\t"
"bllt quicksort\n\t"
"cmp r6, r4\n\t"
"movgt %0, r5\n\t"
"movgt %1, r4\n\t"
"movgt %2, r6\n\t"
"blgt quicksort\n\t"
"pop {r4, r5, r6, r7, r8, r9, sl, lr}\n\t"
"bx lr\n\t"
:
:
"r"(arr0),
"r"(left0),
"r"(right0)
:
);
}
int main(void){
uint32_t intarray[5]={5,39,2,44,23};
quickSort(intarray,0,nMAX-1);
printf("%d\n%d\n%d\n%d\n%d",intarray[0],intarray[1],intarray[2],intarray[3],intarray[4]);
return 0;
}