#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 */
int /*<<< orphan*/ fabs(double);
double fmax(int /*<<< orphan*/, int /*<<< orphan*/);
int /*<<< orphan*/ printf(char *);
double rand_double();
double tic();
double benchmark() {
  double elapsed;
  double x;
  double y;
  double z;
  double t;
  int i;
  t = tic();
  for (i = 0; i < 1000000; i++) {
    x = (1000.0 * rand_double()) - 500.0;
    y = (1000.0 * rand_double()) - 500.0;
    z = fmax(fabs(x), fabs(y));
    if (z != z) {
      printf("should not return NaN\n");
      break;
    }
  }
  elapsed = tic() - t;
  if (z != z) {
    printf("should not return NaN\n");
  }
  return elapsed;
}


x86 assembly (clang, -O0):
<benchmark>:
push   %rbp
mov    %rsp,%rbp
sub    $0x30,%rsp
mov    $0x0,%al
call   1040 <tic@plt>
movsd  %xmm0,-0x28(%rbp)
movl   $0x0,-0x2c(%rbp)
cmpl   $0xf4240,-0x2c(%rbp)
jge    1225 <benchmark+0xd5>
mov    $0x0,%al
call   1050 <rand_double@plt>
movsd  0xe79(%rip),%xmm1
mulsd  %xmm1,%xmm0
movsd  0xe75(%rip),%xmm1
addsd  %xmm1,%xmm0
movsd  %xmm0,-0x10(%rbp)
mov    $0x0,%al
call   1050 <rand_double@plt>
movsd  0xe55(%rip),%xmm1
mulsd  %xmm1,%xmm0
movsd  0xe51(%rip),%xmm1
addsd  %xmm1,%xmm0
movsd  %xmm0,-0x18(%rbp)
movsd  -0x10(%rbp),%xmm0
call   1060 <fabs@plt>
mov    %eax,-0x30(%rbp)
movsd  -0x18(%rbp),%xmm0
call   1060 <fabs@plt>
mov    -0x30(%rbp),%edi
mov    %eax,%esi
call   1070 <fmax@plt>
movsd  %xmm0,-0x20(%rbp)
movsd  -0x20(%rbp),%xmm0
ucomisd -0x20(%rbp),%xmm0
jne    1201 <benchmark+0xb1>
jp     1201 <benchmark+0xb1>
jmp    1212 <benchmark+0xc2>
lea    0xe08(%rip),%rdi
call   1030 <printf@plt>
jmp    1225 <benchmark+0xd5>
jmp    1217 <benchmark+0xc7>
mov    -0x2c(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x2c(%rbp)
jmp    116b <benchmark+0x1b>
mov    $0x0,%al
call   1040 <tic@plt>
subsd  -0x28(%rbp),%xmm0
movsd  %xmm0,-0x8(%rbp)
movsd  -0x20(%rbp),%xmm0
ucomisd -0x20(%rbp),%xmm0
jne    1251 <benchmark+0x101>
jp     1251 <benchmark+0x101>
jmp    125d <benchmark+0x10d>
lea    0xdb8(%rip),%rdi
call   1030 <printf@plt>
movsd  -0x8(%rbp),%xmm0
add    $0x30,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<benchmark>:
push   %rbp
push   %rbx
sub    $0x18,%rsp
xor    %eax,%eax
call   1040 <tic@plt>
movsd  %xmm0,0x8(%rsp)
mov    $0xf4240,%ebp
nopl   0x0(%rax,%rax,1)
xor    %eax,%eax
call   1050 <rand_double@plt>
movapd %xmm0,%xmm1
movsd  0xe7d(%rip),%xmm0
mulsd  %xmm0,%xmm1
movsd  0xe79(%rip),%xmm0
addsd  %xmm0,%xmm1
movsd  %xmm1,(%rsp)
xor    %eax,%eax
call   1050 <rand_double@plt>
mulsd  0xe59(%rip),%xmm0
addsd  0xe59(%rip),%xmm0
movsd  %xmm0,0x10(%rsp)
movsd  (%rsp),%xmm0
call   1060 <fabs@plt>
mov    %eax,%ebx
movsd  0x10(%rsp),%xmm0
call   1060 <fabs@plt>
mov    %ebx,%edi
mov    %eax,%esi
call   1070 <fmax@plt>
ucomisd %xmm0,%xmm0
jp     11e9 <benchmark+0x99>
add    $0xffffffff,%ebp
jne    1170 <benchmark+0x20>
xor    %eax,%eax
call   1040 <tic@plt>
jmp    1211 <benchmark+0xc1>
lea    0xe20(%rip),%rbx
mov    %rbx,%rdi
call   1030 <puts@plt>
xor    %eax,%eax
call   1040 <tic@plt>
movsd  %xmm0,(%rsp)
mov    %rbx,%rdi
call   1030 <puts@plt>
movsd  (%rsp),%xmm0
subsd  0x8(%rsp),%xmm0
add    $0x18,%rsp
pop    %rbx
pop    %rbp
ret

LLVM IR (-O0):
@.str = [23 x i8] c"should not return NaN\0A\00"
define double @benchmark() {
%1 = alloca double
%2 = alloca double
%3 = alloca double
%4 = alloca double
%5 = alloca double
%6 = alloca i32
%7 = call double (...) @tic()
store double %7, double* %5
store i32 0, i32* %6
br label %8
8: ; preds = %27, %0
%9 = load i32, i32* %6
%10 = icmp slt i32 %9, 1000000
br i1 %10, label %11, label %30
11: ; preds = %8
%12 = call double (...) @rand_double()
%13 = call double @llvm.fmuladd.f64(double 1.000000e+03, double %12, double -5.000000e+02)
store double %13, double* %2
%14 = call double (...) @rand_double()
%15 = call double @llvm.fmuladd.f64(double 1.000000e+03, double %14, double -5.000000e+02)
store double %15, double* %3
%16 = load double, double* %2
%17 = call i32 @fabs(double %16)
%18 = load double, double* %3
%19 = call i32 @fabs(double %18)
%20 = call double @fmax(i32 %17, i32 %19)
store double %20, double* %4
%21 = load double, double* %4
%22 = load double, double* %4
%23 = fcmp une double %21, %22
br i1 %23, label %24, label %26
24: ; preds = %11
%25 = call i32 @printf(i8* getelementptr inbounds ([23 x i8], [23 x i8]* @.str, i64 0, i64 0))
br label %30
26: ; preds = %11
br label %27
27: ; preds = %26
%28 = load i32, i32* %6
%29 = add nsw i32 %28, 1
store i32 %29, i32* %6
br label %8
30: ; preds = %24, %8
%31 = call double (...) @tic()
%32 = load double, double* %5
%33 = fsub double %31, %32
store double %33, double* %1
%34 = load double, double* %4
%35 = load double, double* %4
%36 = fcmp une double %34, %35
br i1 %36, label %37, label %39
37: ; preds = %30
%38 = call i32 @printf(i8* getelementptr inbounds ([23 x i8], [23 x i8]* @.str, i64 0, i64 0))
br label %39
39: ; preds = %37, %30
%40 = load double, double* %1
ret double %40
}

LLVM IR (-O2):
@str.1 = [22 x i8] c"should not return NaN\00"
define double @benchmark() {
%1 = tail call double (...) @tic()
br label %5
2: ; preds = %5
%3 = add nuw nsw i32 %6, 1
%4 = icmp eq i32 %3, 1000000
br i1 %4, label %15, label %5
5: ; preds = %0, %2
%6 = phi i32 [ 0, %0 ], [ %3, %2 ]
%7 = tail call double (...) @rand_double()
%8 = tail call double @llvm.fmuladd.f64(double %7, double 1.000000e+03, double -5.000000e+02)
%9 = tail call double (...) @rand_double()
%10 = tail call double @llvm.fmuladd.f64(double %9, double 1.000000e+03, double -5.000000e+02)
%11 = tail call i32 @fabs(double %8)
%12 = tail call i32 @fabs(double %10)
%13 = tail call double @fmax(i32 %11, i32 %12)
%14 = fcmp uno double %13, 0.000000e+00
br i1 %14, label %17, label %2
15: ; preds = %2
%16 = tail call double (...) @tic()
br label %21
17: ; preds = %5
%18 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([22 x i8], [22 x i8]* @str.1, i64 0, i64 0))
%19 = tail call double (...) @tic()
%20 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([22 x i8], [22 x i8]* @str.1, i64 0, i64 0))
br label %21
21: ; preds = %15, %17
%22 = phi double [ %19, %17 ], [ %16, %15 ]
%23 = fsub double %22, %1
ret double %23
}