#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 asin(float const);
float const sqrt(float);
float afe_theta_of_accel(const float *accel) {
  float g2 = accel[0] * accel[0] + accel[1] * accel[1] + accel[2] * accel[2];
  return -asin(accel[0] / sqrt(g2));
}


x86 assembly (clang, -O0):
<afe_theta_of_accel>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
mov    %rdi,-0x8(%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
movss  %xmm0,-0xc(%rbp)
mov    -0x8(%rbp),%rax
movss  (%rax),%xmm0
movss  %xmm0,-0x10(%rbp)
movss  -0xc(%rbp),%xmm0
call   1040 <sqrt@plt>
movaps %xmm0,%xmm1
movss  -0x10(%rbp),%xmm0
divss  %xmm1,%xmm0
call   1030 <asin@plt>
movd   %xmm0,%eax
xor    $0x80000000,%eax
movd   %eax,%xmm0
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<afe_theta_of_accel>:
push   %rax
movss  (%rdi),%xmm2
movss  0x4(%rdi),%xmm0
mulss  %xmm0,%xmm0
movaps %xmm2,%xmm1
mulss  %xmm2,%xmm1
addss  %xmm0,%xmm1
movss  0x8(%rdi),%xmm0
mulss  %xmm0,%xmm0
addss  %xmm1,%xmm0
xorps  %xmm1,%xmm1
ucomiss %xmm1,%xmm0
jb     1154 <afe_theta_of_accel+0x34>
sqrtss %xmm0,%xmm0
jmp    1165 <afe_theta_of_accel+0x45>
movss  %xmm2,0x4(%rsp)
call   1040 <sqrt@plt>
movss  0x4(%rsp),%xmm2
divss  %xmm0,%xmm2
movaps %xmm2,%xmm0
call   1030 <asin@plt>
xorps  0xe88(%rip),%xmm0
pop    %rax
ret

LLVM IR (-O0):
define float @afe_theta_of_accel(float* %0) {
%2 = alloca float*
%3 = alloca float
store float* %0, float** %2
%4 = load float*, float** %2
%5 = getelementptr inbounds float, float* %4, i64 0
%6 = load float, float* %5
%7 = load float*, float** %2
%8 = getelementptr inbounds float, float* %7, i64 0
%9 = load float, float* %8
%10 = load float*, float** %2
%11 = getelementptr inbounds float, float* %10, i64 1
%12 = load float, float* %11
%13 = load float*, float** %2
%14 = getelementptr inbounds float, float* %13, i64 1
%15 = load float, float* %14
%16 = fmul float %12, %15
%17 = call float @llvm.fmuladd.f32(float %6, float %9, float %16)
%18 = load float*, float** %2
%19 = getelementptr inbounds float, float* %18, i64 2
%20 = load float, float* %19
%21 = load float*, float** %2
%22 = getelementptr inbounds float, float* %21, i64 2
%23 = load float, float* %22
%24 = call float @llvm.fmuladd.f32(float %20, float %23, float %17)
store float %24, float* %3
%25 = load float*, float** %2
%26 = getelementptr inbounds float, float* %25, i64 0
%27 = load float, float* %26
%28 = load float, float* %3
%29 = call float @sqrt(float %28)
%30 = fdiv float %27, %29
%31 = call float @asin(float %30)
%32 = fneg float %31
ret float %32
}

LLVM IR (-O2):
define float @afe_theta_of_accel(float* nocapture %0) {
%2 = load float, float* %0
%3 = getelementptr inbounds float, float* %0, i64 1
%4 = load float, float* %3
%5 = fmul float %4, %4
%6 = tail call float @llvm.fmuladd.f32(float %2, float %2, float %5)
%7 = getelementptr inbounds float, float* %0, i64 2
%8 = load float, float* %7
%9 = tail call float @llvm.fmuladd.f32(float %8, float %8, float %6)
%10 = tail call float @sqrt(float %9)
%11 = fdiv float %2, %10
%12 = tail call float @asin(float %11)
%13 = fneg float %12
ret float %13
}