#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 vnorm(double *v) {
  double d;
  d = v[0] * v[0] + v[1] * v[1] + v[2] * v[2];
  d = sqrt(d);
  if (d != 0)
    d = 1.0 / d;
  v[0] *= d, v[1] *= d, v[2] *= d;
}


x86 assembly (clang, -O0):
<vnorm>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
mov    %rdi,-0x8(%rbp)
mov    -0x8(%rbp),%rax
movsd  (%rax),%xmm1
mov    -0x8(%rbp),%rax
movsd  (%rax),%xmm2
mov    -0x8(%rbp),%rax
movsd  0x8(%rax),%xmm0
mov    -0x8(%rbp),%rax
mulsd  0x8(%rax),%xmm0
mulsd  %xmm2,%xmm1
addsd  %xmm0,%xmm1
mov    -0x8(%rbp),%rax
movsd  0x10(%rax),%xmm0
mov    -0x8(%rbp),%rax
movsd  0x10(%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),%xmm0
xorps  %xmm1,%xmm1
ucomisd %xmm1,%xmm0
jne    1191 <vnorm+0x81>
jp     1191 <vnorm+0x81>
jmp    11a3 <vnorm+0x93>
movsd  0xe67(%rip),%xmm0
divsd  -0x10(%rbp),%xmm0
movsd  %xmm0,-0x10(%rbp)
movsd  -0x10(%rbp),%xmm0
mov    -0x8(%rbp),%rax
mulsd  (%rax),%xmm0
movsd  %xmm0,(%rax)
movsd  -0x10(%rbp),%xmm0
mov    -0x8(%rbp),%rax
mulsd  0x8(%rax),%xmm0
movsd  %xmm0,0x8(%rax)
movsd  -0x10(%rbp),%xmm0
mov    -0x8(%rbp),%rax
mulsd  0x10(%rax),%xmm0
movsd  %xmm0,0x10(%rax)
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<vnorm>:
push   %rbx
mov    %rdi,%rbx
movsd  (%rdi),%xmm1
movsd  0x8(%rdi),%xmm0
mulsd  %xmm0,%xmm0
mulsd  %xmm1,%xmm1
addsd  %xmm0,%xmm1
movsd  0x10(%rdi),%xmm0
mulsd  %xmm0,%xmm0
addsd  %xmm1,%xmm0
xorpd  %xmm1,%xmm1
ucomisd %xmm1,%xmm0
jb     1146 <vnorm+0x36>
sqrtsd %xmm0,%xmm0
jmp    114f <vnorm+0x3f>
call   1030 <sqrt@plt>
xorpd  %xmm1,%xmm1
ucomisd %xmm1,%xmm0
jne    1157 <vnorm+0x47>
jnp    1167 <vnorm+0x57>
movsd  0xea1(%rip),%xmm1
divsd  %xmm0,%xmm1
movapd %xmm1,%xmm0
movupd (%rbx),%xmm1
movapd %xmm0,%xmm2
unpcklpd %xmm0,%xmm2
mulpd  %xmm1,%xmm2
movupd %xmm2,(%rbx)
mulsd  0x10(%rbx),%xmm0
movsd  %xmm0,0x10(%rbx)
pop    %rbx
ret

LLVM IR (-O0):
define void @vnorm(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)
store double %24, double* %3
%25 = load double, double* %3
%26 = call double @sqrt(double %25)
store double %26, double* %3
%27 = load double, double* %3
%28 = fcmp une double %27, 0.000000e+00
br i1 %28, label %29, label %32
29: ; preds = %1
%30 = load double, double* %3
%31 = fdiv double 1.000000e+00, %30
store double %31, double* %3
br label %32
32: ; preds = %29, %1
%33 = load double, double* %3
%34 = load double*, double** %2
%35 = getelementptr inbounds double, double* %34, i64 0
%36 = load double, double* %35
%37 = fmul double %36, %33
store double %37, double* %35
%38 = load double, double* %3
%39 = load double*, double** %2
%40 = getelementptr inbounds double, double* %39, i64 1
%41 = load double, double* %40
%42 = fmul double %41, %38
store double %42, double* %40
%43 = load double, double* %3
%44 = load double*, double** %2
%45 = getelementptr inbounds double, double* %44, i64 2
%46 = load double, double* %45
%47 = fmul double %46, %43
store double %47, double* %45
ret void
}

LLVM IR (-O2):
define void @vnorm(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 = tail call double @sqrt(double %9)
%11 = fcmp une double %10, 0.000000e+00
%12 = fdiv double 1.000000e+00, %10
%13 = select i1 %11, double %12, double %10
%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 = fmul <2 x double> %15, %17
%19 = bitcast double* %0 to <2 x double>*
store <2 x double> %18, <2 x double>* %19
%20 = load double, double* %7
%21 = fmul double %13, %20
store double %21, double* %7
ret void
}