#define NULL ((void *)0)
typedef unsigned long size_t; // Customize by platform.
typedef long intptr_t;
typedef unsigned long uintptr_t;
typedef long scalar_t__; // Either arithmetic or pointer type.
/* By default, we understand bool (as a convenience). */
typedef int bool;
#define false 0
#define true 1

/* Forward declarations */

/* Type definitions */

/* Variables and functions */
float sqrtf(float);
void vect_norm(float a[3], float res[3]) {
  float len = sqrtf(a[0] * a[0] + a[1] * a[1] + a[2] * a[2]);
  res[0] = a[0] / len;
  res[1] = a[1] / len;
  res[2] = a[2] / len;
}


x86 assembly (clang, -O0):
<vect_norm>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
mov    -0x8(%rbp),%rax
movss  (%rax),%xmm1
mov    -0x8(%rbp),%rax
movss  (%rax),%xmm2
mov    -0x8(%rbp),%rax
movss  0x4(%rax),%xmm0
mov    -0x8(%rbp),%rax
mulss  0x4(%rax),%xmm0
mulss  %xmm2,%xmm1
addss  %xmm0,%xmm1
mov    -0x8(%rbp),%rax
movss  0x8(%rax),%xmm0
mov    -0x8(%rbp),%rax
movss  0x8(%rax),%xmm2
mulss  %xmm2,%xmm0
addss  %xmm1,%xmm0
call   1030 <sqrtf@plt>
movss  %xmm0,-0x14(%rbp)
mov    -0x8(%rbp),%rax
movss  (%rax),%xmm0
divss  -0x14(%rbp),%xmm0
mov    -0x10(%rbp),%rax
movss  %xmm0,(%rax)
mov    -0x8(%rbp),%rax
movss  0x4(%rax),%xmm0
divss  -0x14(%rbp),%xmm0
mov    -0x10(%rbp),%rax
movss  %xmm0,0x4(%rax)
mov    -0x8(%rbp),%rax
movss  0x8(%rax),%xmm0
divss  -0x14(%rbp),%xmm0
mov    -0x10(%rbp),%rax
movss  %xmm0,0x8(%rax)
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<vect_norm>:
push   %r14
push   %rbx
push   %rax
mov    %rsi,%r14
mov    %rdi,%rbx
movss  (%rdi),%xmm1
movss  0x4(%rdi),%xmm0
mulss  %xmm0,%xmm0
mulss  %xmm1,%xmm1
addss  %xmm0,%xmm1
movss  0x8(%rdi),%xmm0
mulss  %xmm0,%xmm0
addss  %xmm1,%xmm0
xorps  %xmm1,%xmm1
ucomiss %xmm1,%xmm0
jb     114a <vect_norm+0x3a>
sqrtss %xmm0,%xmm0
jmp    114f <vect_norm+0x3f>
call   1030 <sqrtf@plt>
movss  (%rbx),%xmm1
divss  %xmm0,%xmm1
movss  %xmm1,(%r14)
movss  0x4(%rbx),%xmm1
divss  %xmm0,%xmm1
movss  %xmm1,0x4(%r14)
movss  0x8(%rbx),%xmm1
divss  %xmm0,%xmm1
movss  %xmm1,0x8(%r14)
add    $0x8,%rsp
pop    %rbx
pop    %r14
ret

LLVM IR (-O0):
define void @vect_norm(float* %0, float* %1) {
%3 = alloca float*
%4 = alloca float*
%5 = alloca float
store float* %0, float** %3
store float* %1, float** %4
%6 = load float*, float** %3
%7 = getelementptr inbounds float, float* %6, i64 0
%8 = load float, float* %7
%9 = load float*, float** %3
%10 = getelementptr inbounds float, float* %9, i64 0
%11 = load float, float* %10
%12 = load float*, float** %3
%13 = getelementptr inbounds float, float* %12, i64 1
%14 = load float, float* %13
%15 = load float*, float** %3
%16 = getelementptr inbounds float, float* %15, i64 1
%17 = load float, float* %16
%18 = fmul float %14, %17
%19 = call float @llvm.fmuladd.f32(float %8, float %11, float %18)
%20 = load float*, float** %3
%21 = getelementptr inbounds float, float* %20, i64 2
%22 = load float, float* %21
%23 = load float*, float** %3
%24 = getelementptr inbounds float, float* %23, i64 2
%25 = load float, float* %24
%26 = call float @llvm.fmuladd.f32(float %22, float %25, float %19)
%27 = call float @sqrtf(float %26)
store float %27, float* %5
%28 = load float*, float** %3
%29 = getelementptr inbounds float, float* %28, i64 0
%30 = load float, float* %29
%31 = load float, float* %5
%32 = fdiv float %30, %31
%33 = load float*, float** %4
%34 = getelementptr inbounds float, float* %33, i64 0
store float %32, float* %34
%35 = load float*, float** %3
%36 = getelementptr inbounds float, float* %35, i64 1
%37 = load float, float* %36
%38 = load float, float* %5
%39 = fdiv float %37, %38
%40 = load float*, float** %4
%41 = getelementptr inbounds float, float* %40, i64 1
store float %39, float* %41
%42 = load float*, float** %3
%43 = getelementptr inbounds float, float* %42, i64 2
%44 = load float, float* %43
%45 = load float, float* %5
%46 = fdiv float %44, %45
%47 = load float*, float** %4
%48 = getelementptr inbounds float, float* %47, i64 2
store float %46, float* %48
ret void
}

LLVM IR (-O2):
define void @vect_norm(float* nocapture %0, float* nocapture writeonly %1) {
%3 = load float, float* %0
%4 = getelementptr inbounds float, float* %0, i64 1
%5 = load float, float* %4
%6 = fmul float %5, %5
%7 = tail call float @llvm.fmuladd.f32(float %3, float %3, float %6)
%8 = getelementptr inbounds float, float* %0, i64 2
%9 = load float, float* %8
%10 = tail call float @llvm.fmuladd.f32(float %9, float %9, float %7)
%11 = tail call float @sqrtf(float %10)
%12 = load float, float* %0
%13 = fdiv float %12, %11
store float %13, float* %1
%14 = load float, float* %4
%15 = fdiv float %14, %11
%16 = getelementptr inbounds float, float* %1, i64 1
store float %15, float* %16
%17 = load float, float* %8
%18 = fdiv float %17, %11
%19 = getelementptr inbounds float, float* %1, i64 2
store float %18, float* %19
ret void
}