#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 */
typedef struct TYPE_2__ TYPE_1__;

/* Type definitions */
struct TYPE_2__ {
  double tv_usec;
  scalar_t__ tv_sec;
};
struct rusage {
  TYPE_1__ ru_utime;
};

/* Variables and functions */
int /*<<< orphan*/ RUSAGE_SELF;
scalar_t__ getrusage(int /*<<< orphan*/, struct rusage *);
double cputime() {
  struct rusage usage;
  if (getrusage(RUSAGE_SELF, &usage) != 0)
    return 0;
  return ((double)usage.ru_utime.tv_sec + usage.ru_utime.tv_usec * 1.0e-6);
}


x86 assembly (clang, -O0):
<cputime>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    0x2ec1(%rip),%rax
mov    (%rax),%edi
lea    -0x18(%rbp),%rsi
call   1030 <getrusage@plt>
cmp    $0x0,%rax
je     1141 <cputime+0x31>
xorps  %xmm0,%xmm0
movsd  %xmm0,-0x8(%rbp)
jmp    1161 <cputime+0x51>
cvtsi2sdq -0x10(%rbp),%xmm1
movsd  -0x18(%rbp),%xmm0
movsd  0xeac(%rip),%xmm2
mulsd  %xmm2,%xmm0
addsd  %xmm1,%xmm0
movsd  %xmm0,-0x8(%rbp)
movsd  -0x8(%rbp),%xmm0
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<cputime>:
sub    $0x18,%rsp
mov    0x2ec5(%rip),%rax
mov    (%rax),%edi
lea    0x8(%rsp),%rsi
call   1030 <getrusage@plt>
xorps  %xmm0,%xmm0
test   %rax,%rax
je     1134 <cputime+0x24>
add    $0x18,%rsp
ret
cvtsi2sdq 0x10(%rsp),%xmm1
movsd  0x8(%rsp),%xmm0
mulsd  0xeb7(%rip),%xmm0
addsd  %xmm1,%xmm0
add    $0x18,%rsp
ret

LLVM IR (-O0):
%struct.rusage = type { %struct.TYPE_2__ }
%struct.TYPE_2__ = type { double, i64 }
@RUSAGE_SELF = global i32 0
define double @cputime() {
%1 = alloca double
%2 = alloca %struct.rusage
%3 = load i32, i32* @RUSAGE_SELF
%4 = call i64 @getrusage(i32 %3, %struct.rusage* %2)
%5 = icmp ne i64 %4, 0
br i1 %5, label %6, label %7
6: ; preds = %0
store double 0.000000e+00, double* %1
br label %16
7: ; preds = %0
%8 = getelementptr inbounds %struct.rusage, %struct.rusage* %2, i32 0, i32 0
%9 = getelementptr inbounds %struct.TYPE_2__, %struct.TYPE_2__* %8, i32 0, i32 1
%10 = load i64, i64* %9
%11 = sitofp i64 %10 to double
%12 = getelementptr inbounds %struct.rusage, %struct.rusage* %2, i32 0, i32 0
%13 = getelementptr inbounds %struct.TYPE_2__, %struct.TYPE_2__* %12, i32 0, i32 0
%14 = load double, double* %13
%15 = call double @llvm.fmuladd.f64(double %14, double 0x3EB0C6F7A0B5ED8D, double %11)
store double %15, double* %1
br label %16
16: ; preds = %7, %6
%17 = load double, double* %1
ret double %17
}

LLVM IR (-O2):
%struct.rusage = type { %struct.TYPE_2__ }
%struct.TYPE_2__ = type { double, i64 }
@RUSAGE_SELF = global i32 0
define double @cputime() {
%1 = alloca %struct.rusage
%2 = bitcast %struct.rusage* %1 to i8*
%3 = load i32, i32* @RUSAGE_SELF
%4 = call i64 @getrusage(i32 %3, %struct.rusage* %1)
%5 = icmp eq i64 %4, 0
br i1 %5, label %6, label %13
6: ; preds = %0
%7 = getelementptr inbounds %struct.rusage, %struct.rusage* %1, i64 0, i32 0, i32 1
%8 = load i64, i64* %7
%9 = sitofp i64 %8 to double
%10 = getelementptr inbounds %struct.rusage, %struct.rusage* %1, i64 0, i32 0, i32 0
%11 = load double, double* %10
%12 = call double @llvm.fmuladd.f64(double %11, double 0x3EB0C6F7A0B5ED8D, double %9)
br label %13
13: ; preds = %0, %6
%14 = phi double [ %12, %6 ], [ 0.000000e+00, %0 ]
ret double %14
}