#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 */
double sqrt(double);
void norm_quat(double *quat) {
  double mag = quat[0] * quat[0] + quat[1] * quat[1] + quat[2] * quat[2] +
               quat[3] * quat[3];
  mag = sqrt(mag);
  quat[0] /= mag;
  quat[1] /= mag;
  quat[2] /= mag;
  quat[3] /= mag;
}


x86 assembly (clang, -O0):
<norm_quat>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
mov    %rdi,-0x8(%rbp)
mov    -0x8(%rbp),%rax
movsd  (%rax),%xmm0
mov    -0x8(%rbp),%rax
movsd  (%rax),%xmm2
mov    -0x8(%rbp),%rax
movsd  0x8(%rax),%xmm1
mov    -0x8(%rbp),%rax
mulsd  0x8(%rax),%xmm1
mulsd  %xmm2,%xmm0
addsd  %xmm1,%xmm0
mov    -0x8(%rbp),%rax
movsd  0x10(%rax),%xmm1
mov    -0x8(%rbp),%rax
movsd  0x10(%rax),%xmm2
mulsd  %xmm2,%xmm1
addsd  %xmm0,%xmm1
mov    -0x8(%rbp),%rax
movsd  0x18(%rax),%xmm0
mov    -0x8(%rbp),%rax
movsd  0x18(%rax),%xmm2
mulsd  %xmm2,%xmm0
addsd  %xmm1,%xmm0
movsd  %xmm0,-0x10(%rbp)
movsd  -0x10(%rbp),%xmm0
call   1030 <sqrt@plt>
movsd  %xmm0,-0x10(%rbp)
movsd  -0x10(%rbp),%xmm1
mov    -0x8(%rbp),%rax
movsd  (%rax),%xmm0
divsd  %xmm1,%xmm0
movsd  %xmm0,(%rax)
movsd  -0x10(%rbp),%xmm1
mov    -0x8(%rbp),%rax
movsd  0x8(%rax),%xmm0
divsd  %xmm1,%xmm0
movsd  %xmm0,0x8(%rax)
movsd  -0x10(%rbp),%xmm1
mov    -0x8(%rbp),%rax
movsd  0x10(%rax),%xmm0
divsd  %xmm1,%xmm0
movsd  %xmm0,0x10(%rax)
movsd  -0x10(%rbp),%xmm1
mov    -0x8(%rbp),%rax
movsd  0x18(%rax),%xmm0
divsd  %xmm1,%xmm0
movsd  %xmm0,0x18(%rax)
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<norm_quat>:
push   %rbx
mov    %rdi,%rbx
movsd  (%rdi),%xmm0
movsd  0x8(%rdi),%xmm1
mulsd  %xmm1,%xmm1
mulsd  %xmm0,%xmm0
addsd  %xmm1,%xmm0
movsd  0x10(%rdi),%xmm1
mulsd  %xmm1,%xmm1
addsd  %xmm0,%xmm1
movsd  0x18(%rdi),%xmm0
mulsd  %xmm0,%xmm0
addsd  %xmm1,%xmm0
xorpd  %xmm1,%xmm1
ucomisd %xmm1,%xmm0
jb     1153 <norm_quat+0x43>
sqrtsd %xmm0,%xmm0
jmp    1158 <norm_quat+0x48>
call   1030 <sqrt@plt>
unpcklpd %xmm0,%xmm0
movupd (%rbx),%xmm1
movupd 0x10(%rbx),%xmm2
divpd  %xmm0,%xmm1
movupd %xmm1,(%rbx)
divpd  %xmm0,%xmm2
movupd %xmm2,0x10(%rbx)
pop    %rbx
ret

LLVM IR (-O0):
define void @norm_quat(double* %0) {
%2 = alloca double*
%3 = alloca double
store double* %0, double** %2
%4 = load double*, double** %2
%5 = getelementptr inbounds double, double* %4, i64 0
%6 = load double, double* %5
%7 = load double*, double** %2
%8 = getelementptr inbounds double, double* %7, i64 0
%9 = load double, double* %8
%10 = load double*, double** %2
%11 = getelementptr inbounds double, double* %10, i64 1
%12 = load double, double* %11
%13 = load double*, double** %2
%14 = getelementptr inbounds double, double* %13, i64 1
%15 = load double, double* %14
%16 = fmul double %12, %15
%17 = call double @llvm.fmuladd.f64(double %6, double %9, double %16)
%18 = load double*, double** %2
%19 = getelementptr inbounds double, double* %18, i64 2
%20 = load double, double* %19
%21 = load double*, double** %2
%22 = getelementptr inbounds double, double* %21, i64 2
%23 = load double, double* %22
%24 = call double @llvm.fmuladd.f64(double %20, double %23, double %17)
%25 = load double*, double** %2
%26 = getelementptr inbounds double, double* %25, i64 3
%27 = load double, double* %26
%28 = load double*, double** %2
%29 = getelementptr inbounds double, double* %28, i64 3
%30 = load double, double* %29
%31 = call double @llvm.fmuladd.f64(double %27, double %30, double %24)
store double %31, double* %3
%32 = load double, double* %3
%33 = call double @sqrt(double %32)
store double %33, double* %3
%34 = load double, double* %3
%35 = load double*, double** %2
%36 = getelementptr inbounds double, double* %35, i64 0
%37 = load double, double* %36
%38 = fdiv double %37, %34
store double %38, double* %36
%39 = load double, double* %3
%40 = load double*, double** %2
%41 = getelementptr inbounds double, double* %40, i64 1
%42 = load double, double* %41
%43 = fdiv double %42, %39
store double %43, double* %41
%44 = load double, double* %3
%45 = load double*, double** %2
%46 = getelementptr inbounds double, double* %45, i64 2
%47 = load double, double* %46
%48 = fdiv double %47, %44
store double %48, double* %46
%49 = load double, double* %3
%50 = load double*, double** %2
%51 = getelementptr inbounds double, double* %50, i64 3
%52 = load double, double* %51
%53 = fdiv double %52, %49
store double %53, double* %51
ret void
}

LLVM IR (-O2):
define void @norm_quat(double* nocapture %0) {
%2 = load double, double* %0
%3 = getelementptr inbounds double, double* %0, i64 1
%4 = load double, double* %3
%5 = fmul double %4, %4
%6 = tail call double @llvm.fmuladd.f64(double %2, double %2, double %5)
%7 = getelementptr inbounds double, double* %0, i64 2
%8 = load double, double* %7
%9 = tail call double @llvm.fmuladd.f64(double %8, double %8, double %6)
%10 = getelementptr inbounds double, double* %0, i64 3
%11 = load double, double* %10
%12 = tail call double @llvm.fmuladd.f64(double %11, double %11, double %9)
%13 = tail call double @sqrt(double %12)
%14 = bitcast double* %0 to <2 x double>*
%15 = load <2 x double>, <2 x double>* %14
%16 = insertelement <2 x double> poison, double %13, i64 0
%17 = shufflevector <2 x double> %16, <2 x double> poison, <2 x i32> zeroinitializer
%18 = fdiv <2 x double> %15, %17
%19 = bitcast double* %0 to <2 x double>*
store <2 x double> %18, <2 x double>* %19
%20 = bitcast double* %7 to <2 x double>*
%21 = load <2 x double>, <2 x double>* %20
%22 = fdiv <2 x double> %21, %17
%23 = bitcast double* %7 to <2 x double>*
store <2 x double> %22, <2 x double>* %23
ret void
}