#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 RandDouble();
double log(double);
double sqrt(double);
double RandNormal() {
  double x1, x2, w;
  do {
    x1 = 2.0 * RandDouble() - 1.0;
    x2 = 2.0 * RandDouble() - 1.0;
    w = x1 * x1 + x2 * x2;
  } while (w >= 1.0 || w == 0.0);
  w = sqrt((-2.0 * log(w)) / w);
  return x1 * w;
}


x86 assembly (clang, -O0):
<RandNormal>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    $0x0,%al
call   1030 <RandDouble@plt>
addsd  %xmm0,%xmm0
movsd  0xeb5(%rip),%xmm1
addsd  %xmm1,%xmm0
movsd  %xmm0,-0x8(%rbp)
mov    $0x0,%al
call   1030 <RandDouble@plt>
addsd  %xmm0,%xmm0
movsd  0xe99(%rip),%xmm1
addsd  %xmm1,%xmm0
movsd  %xmm0,-0x10(%rbp)
movsd  -0x8(%rbp),%xmm0
movsd  -0x8(%rbp),%xmm2
movsd  -0x10(%rbp),%xmm1
mulsd  -0x10(%rbp),%xmm1
mulsd  %xmm2,%xmm0
addsd  %xmm1,%xmm0
movsd  %xmm0,-0x18(%rbp)
movsd  -0x18(%rbp),%xmm0
mov    $0x1,%al
movsd  0xe68(%rip),%xmm1
ucomisd %xmm1,%xmm0
mov    %al,-0x19(%rbp)
jae    11c4 <RandNormal+0x94>
movsd  -0x18(%rbp),%xmm0
xorps  %xmm1,%xmm1
ucomisd %xmm1,%xmm0
sete   %al
setnp  %cl
and    %cl,%al
mov    %al,-0x19(%rbp)
mov    -0x19(%rbp),%al
test   $0x1,%al
jne    1138 <RandNormal+0x8>
movsd  -0x18(%rbp),%xmm0
call   1040 <log@plt>
movaps %xmm0,%xmm1
movsd  0xe2c(%rip),%xmm0
mulsd  %xmm1,%xmm0
divsd  -0x18(%rbp),%xmm0
call   1050 <sqrt@plt>
movsd  %xmm0,-0x18(%rbp)
movsd  -0x8(%rbp),%xmm0
mulsd  -0x18(%rbp),%xmm0
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<RandNormal>:
sub    $0x18,%rsp
cs nopw 0x0(%rax,%rax,1)
xchg   %ax,%ax
xor    %eax,%eax
call   1030 <RandDouble@plt>
movapd %xmm0,%xmm1
addsd  %xmm0,%xmm1
movsd  0xea9(%rip),%xmm0
addsd  %xmm0,%xmm1
movsd  %xmm1,0x8(%rsp)
xor    %eax,%eax
call   1030 <RandDouble@plt>
addsd  %xmm0,%xmm0
addsd  0xe8c(%rip),%xmm0
mulsd  %xmm0,%xmm0
movsd  0x8(%rsp),%xmm1
mulsd  %xmm1,%xmm1
addsd  %xmm0,%xmm1
ucomisd 0xe7a(%rip),%xmm1
jae    1140 <RandNormal+0x10>
ucomisd 0xe80(%rip),%xmm1
jne    119c <RandNormal+0x6c>
jnp    1140 <RandNormal+0x10>
movapd %xmm1,%xmm0
movsd  %xmm1,0x10(%rsp)
call   1040 <log@plt>
mulsd  0xe5d(%rip),%xmm0
divsd  0x10(%rsp),%xmm0
xorpd  %xmm1,%xmm1
ucomisd %xmm1,%xmm0
jb     11c9 <RandNormal+0x99>
sqrtsd %xmm0,%xmm0
jmp    11ce <RandNormal+0x9e>
call   1050 <sqrt@plt>
movsd  0x8(%rsp),%xmm1
mulsd  %xmm0,%xmm1
movapd %xmm1,%xmm0
add    $0x18,%rsp
ret

LLVM IR (-O0):
define double @RandNormal() {
%1 = alloca double
%2 = alloca double
%3 = alloca double
br label %4
4: ; preds = %21, %0
%5 = call double (...) @RandDouble()
%6 = call double @llvm.fmuladd.f64(double 2.000000e+00, double %5, double -1.000000e+00)
store double %6, double* %1
%7 = call double (...) @RandDouble()
%8 = call double @llvm.fmuladd.f64(double 2.000000e+00, double %7, double -1.000000e+00)
store double %8, double* %2
%9 = load double, double* %1
%10 = load double, double* %1
%11 = load double, double* %2
%12 = load double, double* %2
%13 = fmul double %11, %12
%14 = call double @llvm.fmuladd.f64(double %9, double %10, double %13)
store double %14, double* %3
br label %15
15: ; preds = %4
%16 = load double, double* %3
%17 = fcmp oge double %16, 1.000000e+00
br i1 %17, label %21, label %18
18: ; preds = %15
%19 = load double, double* %3
%20 = fcmp oeq double %19, 0.000000e+00
br label %21
21: ; preds = %18, %15
%22 = phi i1 [ true, %15 ], [ %20, %18 ]
br i1 %22, label %4, label %23
23: ; preds = %21
%24 = load double, double* %3
%25 = call double @log(double %24)
%26 = fmul double -2.000000e+00, %25
%27 = load double, double* %3
%28 = fdiv double %26, %27
%29 = call double @sqrt(double %28)
store double %29, double* %3
%30 = load double, double* %1
%31 = load double, double* %3
%32 = fmul double %30, %31
ret double %32
}

LLVM IR (-O2):
define double @RandNormal() {
br label %1
1: ; preds = %1, %0
%2 = tail call double (...) @RandDouble()
%3 = tail call double @llvm.fmuladd.f64(double %2, double 2.000000e+00, double -1.000000e+00)
%4 = tail call double (...) @RandDouble()
%5 = tail call double @llvm.fmuladd.f64(double %4, double 2.000000e+00, double -1.000000e+00)
%6 = fmul double %5, %5
%7 = tail call double @llvm.fmuladd.f64(double %3, double %3, double %6)
%8 = fcmp oge double %7, 1.000000e+00
%9 = fcmp oeq double %7, 0.000000e+00
%10 = or i1 %8, %9
br i1 %10, label %1, label %11
11: ; preds = %1
%12 = tail call double @log(double %7)
%13 = fmul double %12, -2.000000e+00
%14 = fdiv double %13, %7
%15 = tail call double @sqrt(double %14)
%16 = fmul double %3, %15
ret double %16
}