#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);
double glmNormalizeVector2d(double v[2]) {
  double length;
  length = sqrt(v[0] * v[0] + v[1] * v[1]);
  if (length > 0) {
    v[0] /= length;
    v[1] /= length;
  }
  return length;
}


x86 assembly (clang, -O0):
<glmNormalizeVector2d>:
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
call   1030 <sqrt@plt>
movsd  %xmm0,-0x10(%rbp)
movsd  -0x10(%rbp),%xmm0
xorps  %xmm1,%xmm1
ucomisd %xmm1,%xmm0
jbe    118e <glmNormalizeVector2d+0x7e>
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),%xmm0
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<glmNormalizeVector2d>:
push   %rbx
mov    %rdi,%rbx
movsd  (%rdi),%xmm0
movsd  0x8(%rdi),%xmm1
mulsd  %xmm1,%xmm1
mulsd  %xmm0,%xmm0
addsd  %xmm1,%xmm0
xorpd  %xmm1,%xmm1
ucomisd %xmm1,%xmm0
jb     113f <glmNormalizeVector2d+0x2f>
sqrtsd %xmm0,%xmm0
ucomisd %xmm1,%xmm0
ja     114e <glmNormalizeVector2d+0x3e>
jmp    1162 <glmNormalizeVector2d+0x52>
call   1030 <sqrt@plt>
xorpd  %xmm1,%xmm1
ucomisd %xmm1,%xmm0
jbe    1162 <glmNormalizeVector2d+0x52>
movupd (%rbx),%xmm1
movapd %xmm0,%xmm2
unpcklpd %xmm0,%xmm2
divpd  %xmm2,%xmm1
movupd %xmm1,(%rbx)
pop    %rbx
ret

LLVM IR (-O0):
define double @glmNormalizeVector2d(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 = call double @sqrt(double %17)
store double %18, double* %3
%19 = load double, double* %3
%20 = fcmp ogt double %19, 0.000000e+00
br i1 %20, label %21, label %32
21: ; preds = %1
%22 = load double, double* %3
%23 = load double*, double** %2
%24 = getelementptr inbounds double, double* %23, i64 0
%25 = load double, double* %24
%26 = fdiv double %25, %22
store double %26, double* %24
%27 = load double, double* %3
%28 = load double*, double** %2
%29 = getelementptr inbounds double, double* %28, i64 1
%30 = load double, double* %29
%31 = fdiv double %30, %27
store double %31, double* %29
br label %32
32: ; preds = %21, %1
%33 = load double, double* %3
ret double %33
}

LLVM IR (-O2):
define double @glmNormalizeVector2d(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 = tail call double @sqrt(double %6)
%8 = fcmp ogt double %7, 0.000000e+00
br i1 %8, label %9, label %16
9: ; preds = %1
%10 = bitcast double* %0 to <2 x double>*
%11 = load <2 x double>, <2 x double>* %10
%12 = insertelement <2 x double> poison, double %7, i64 0
%13 = shufflevector <2 x double> %12, <2 x double> poison, <2 x i32> zeroinitializer
%14 = fdiv <2 x double> %11, %13
%15 = bitcast double* %0 to <2 x double>*
store <2 x double> %14, <2 x double>* %15
br label %16
16: ; preds = %9, %1
ret double %7
}