#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 genrand_real1();
double log(double);
double sqrt(double);
double gausdev(void) {
  static int iset = 0;
  static float gset;
  double fac, rsq, v1, v2;
  if (!iset) {
    do {
      v1 = 2.0 * genrand_real1() - 1.0;
      v2 = 2.0 * genrand_real1() - 1.0;
      rsq = v1 * v1 + v2 * v2;
    } while (rsq >= 1.0 || rsq < 1.0e-15);
    fac = sqrt(-2.0 * log(rsq) / rsq);
    gset = v1 * fac;
    iset = 1;
    return (v2 * fac);
  } else {
    iset = 0;
    return (gset);
  }
}


x86 assembly (clang, -O0):
<gausdev>:
push   %rbp
mov    %rsp,%rbp
sub    $0x30,%rsp
cmpl   $0x0,0x2efd(%rip)
jne    1239 <gausdev+0x109>
jmp    114a <gausdev+0x1a>
mov    $0x0,%al
call   1050 <genrand_real1@plt>
addsd  %xmm0,%xmm0
movsd  0xea3(%rip),%xmm1
addsd  %xmm1,%xmm0
movsd  %xmm0,-0x20(%rbp)
mov    $0x0,%al
call   1050 <genrand_real1@plt>
addsd  %xmm0,%xmm0
movsd  0xe87(%rip),%xmm1
addsd  %xmm1,%xmm0
movsd  %xmm0,-0x28(%rbp)
movsd  -0x20(%rbp),%xmm0
movsd  -0x20(%rbp),%xmm2
movsd  -0x28(%rbp),%xmm1
mulsd  -0x28(%rbp),%xmm1
mulsd  %xmm2,%xmm0
addsd  %xmm1,%xmm0
movsd  %xmm0,-0x18(%rbp)
movsd  -0x18(%rbp),%xmm0
mov    $0x1,%al
movsd  0xe56(%rip),%xmm1
ucomisd %xmm1,%xmm0
mov    %al,-0x29(%rbp)
jae    11d2 <gausdev+0xa2>
movsd  0xe49(%rip),%xmm0
ucomisd -0x18(%rbp),%xmm0
seta   %al
mov    %al,-0x29(%rbp)
mov    -0x29(%rbp),%al
test   $0x1,%al
jne    114a <gausdev+0x1a>
movsd  -0x18(%rbp),%xmm0
call   1030 <log@plt>
movaps %xmm0,%xmm1
movsd  0xe26(%rip),%xmm0
mulsd  %xmm1,%xmm0
divsd  -0x18(%rbp),%xmm0
call   1040 <sqrt@plt>
movsd  %xmm0,-0x10(%rbp)
movsd  -0x20(%rbp),%xmm0
mulsd  -0x10(%rbp),%xmm0
cvtsd2ss %xmm0,%xmm0
movss  %xmm0,0x2e25(%rip)
movl   $0x1,0x2e17(%rip)
movsd  -0x28(%rbp),%xmm0
mulsd  -0x10(%rbp),%xmm0
movsd  %xmm0,-0x8(%rbp)
jmp    1254 <gausdev+0x124>
movl   $0x0,0x2df9(%rip)
movss  0x2df5(%rip),%xmm0
cvtss2sd %xmm0,%xmm0
movsd  %xmm0,-0x8(%rbp)
movsd  -0x8(%rbp),%xmm0
add    $0x30,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<gausdev>:
sub    $0x18,%rsp
cmpb   $0x0,0x2f01(%rip)
je     1160 <gausdev+0x30>
movb   $0x0,0x2ef8(%rip)
movss  0x2ef4(%rip),%xmm0
cvtss2sd %xmm0,%xmm1
jmp    121e <gausdev+0xee>
cs nopw 0x0(%rax,%rax,1)
nop
xor    %eax,%eax
call   1050 <genrand_real1@plt>
movapd %xmm0,%xmm1
addsd  %xmm0,%xmm1
movsd  0xe89(%rip),%xmm0
addsd  %xmm0,%xmm1
movsd  %xmm1,(%rsp)
xor    %eax,%eax
call   1050 <genrand_real1@plt>
addsd  %xmm0,%xmm0
addsd  0xe6d(%rip),%xmm0
movapd %xmm0,%xmm1
mulsd  %xmm0,%xmm1
movsd  (%rsp),%xmm2
mulsd  %xmm2,%xmm2
addsd  %xmm1,%xmm2
ucomisd 0xe58(%rip),%xmm2
jae    1160 <gausdev+0x30>
movsd  0xe56(%rip),%xmm1
ucomisd %xmm2,%xmm1
ja     1160 <gausdev+0x30>
movsd  %xmm0,0x10(%rsp)
movapd %xmm2,%xmm0
movsd  %xmm2,0x8(%rsp)
call   1030 <log@plt>
mulsd  0xe3b(%rip),%xmm0
divsd  0x8(%rsp),%xmm0
xorpd  %xmm1,%xmm1
ucomisd %xmm1,%xmm0
jb     11f3 <gausdev+0xc3>
sqrtsd %xmm0,%xmm0
jmp    11f8 <gausdev+0xc8>
call   1040 <sqrt@plt>
movsd  (%rsp),%xmm1
mulsd  %xmm0,%xmm1
cvtsd2ss %xmm1,%xmm1
movss  %xmm1,0x2e33(%rip)
movb   $0x1,0x2e28(%rip)
movsd  0x10(%rsp),%xmm1
mulsd  %xmm0,%xmm1
movapd %xmm1,%xmm0
add    $0x18,%rsp
ret

LLVM IR (-O0):
@gausdev.iset = internal global i32 0
@gausdev.gset = internal global float 0.000000e+00
define double @gausdev() {
%1 = alloca double
%2 = alloca double
%3 = alloca double
%4 = alloca double
%5 = alloca double
%6 = load i32, i32* @gausdev.iset
%7 = icmp ne i32 %6, 0
br i1 %7, label %42, label %8
8: ; preds = %0
br label %9
9: ; preds = %26, %8
%10 = call double (...) @genrand_real1()
%11 = call double @llvm.fmuladd.f64(double 2.000000e+00, double %10, double -1.000000e+00)
store double %11, double* %4
%12 = call double (...) @genrand_real1()
%13 = call double @llvm.fmuladd.f64(double 2.000000e+00, double %12, double -1.000000e+00)
store double %13, double* %5
%14 = load double, double* %4
%15 = load double, double* %4
%16 = load double, double* %5
%17 = load double, double* %5
%18 = fmul double %16, %17
%19 = call double @llvm.fmuladd.f64(double %14, double %15, double %18)
store double %19, double* %3
br label %20
20: ; preds = %9
%21 = load double, double* %3
%22 = fcmp oge double %21, 1.000000e+00
br i1 %22, label %26, label %23
23: ; preds = %20
%24 = load double, double* %3
%25 = fcmp olt double %24, 1.000000e-15
br label %26
26: ; preds = %23, %20
%27 = phi i1 [ true, %20 ], [ %25, %23 ]
br i1 %27, label %9, label %28
28: ; preds = %26
%29 = load double, double* %3
%30 = call double @log(double %29)
%31 = fmul double -2.000000e+00, %30
%32 = load double, double* %3
%33 = fdiv double %31, %32
%34 = call double @sqrt(double %33)
store double %34, double* %2
%35 = load double, double* %4
%36 = load double, double* %2
%37 = fmul double %35, %36
%38 = fptrunc double %37 to float
store float %38, float* @gausdev.gset
store i32 1, i32* @gausdev.iset
%39 = load double, double* %5
%40 = load double, double* %2
%41 = fmul double %39, %40
store double %41, double* %1
br label %45
42: ; preds = %0
store i32 0, i32* @gausdev.iset
%43 = load float, float* @gausdev.gset
%44 = fpext float %43 to double
store double %44, double* %1
br label %45
45: ; preds = %42, %28
%46 = load double, double* %1
ret double %46
}

LLVM IR (-O2):
@gausdev.iset = internal unnamed_addr global i1 false
@gausdev.gset = internal unnamed_addr global float 0.000000e+00
define double @gausdev() {
%1 = load i1, i1* @gausdev.iset
br i1 %1, label %20, label %2
2: ; preds = %0, %2
%3 = tail call double (...) @genrand_real1()
%4 = tail call double @llvm.fmuladd.f64(double %3, double 2.000000e+00, double -1.000000e+00)
%5 = tail call double (...) @genrand_real1()
%6 = tail call double @llvm.fmuladd.f64(double %5, double 2.000000e+00, double -1.000000e+00)
%7 = fmul double %6, %6
%8 = tail call double @llvm.fmuladd.f64(double %4, double %4, double %7)
%9 = fcmp oge double %8, 1.000000e+00
%10 = fcmp olt double %8, 1.000000e-15
%11 = or i1 %9, %10
br i1 %11, label %2, label %12
12: ; preds = %2
%13 = tail call double @log(double %8)
%14 = fmul double %13, -2.000000e+00
%15 = fdiv double %14, %8
%16 = tail call double @sqrt(double %15)
%17 = fmul double %4, %16
%18 = fptrunc double %17 to float
store float %18, float* @gausdev.gset
store i1 true, i1* @gausdev.iset
%19 = fmul double %6, %16
br label %23
20: ; preds = %0
store i1 false, i1* @gausdev.iset
%21 = load float, float* @gausdev.gset
%22 = fpext float %21 to double
br label %23
23: ; preds = %20, %12
%24 = phi double [ %22, %20 ], [ %19, %12 ]
ret double %24
}