#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 */
struct timeval {
  int tv_sec;
  int tv_usec;
};

/* Variables and functions */
int compareTimeval(const struct timeval *first, const struct timeval *second) {
  int difference = first->tv_sec - second->tv_sec;
  if (difference == 0) {
    difference = first->tv_usec - second->tv_usec;
  }
  return difference;
}


x86 assembly (clang, -O0):
<compareTimeval>:
push   %rbp
mov    %rsp,%rbp
mov    %rdi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
mov    -0x8(%rbp),%rax
mov    (%rax),%eax
mov    -0x10(%rbp),%rcx
sub    (%rcx),%eax
mov    %eax,-0x14(%rbp)
cmpl   $0x0,-0x14(%rbp)
jne    1136 <compareTimeval+0x36>
mov    -0x8(%rbp),%rax
mov    0x4(%rax),%eax
mov    -0x10(%rbp),%rcx
sub    0x4(%rcx),%eax
mov    %eax,-0x14(%rbp)
mov    -0x14(%rbp),%eax
pop    %rbp
ret

x86 assembly (clang, -O2):
<compareTimeval>:
mov    (%rdi),%eax
sub    (%rsi),%eax
je     1107 <compareTimeval+0x7>
ret
mov    0x4(%rdi),%eax
sub    0x4(%rsi),%eax
ret

LLVM IR (-O0):
%struct.timeval = type { i32, i32 }
define i32 @compareTimeval(%struct.timeval* %0, %struct.timeval* %1) {
%3 = alloca %struct.timeval*
%4 = alloca %struct.timeval*
%5 = alloca i32
store %struct.timeval* %0, %struct.timeval** %3
store %struct.timeval* %1, %struct.timeval** %4
%6 = load %struct.timeval*, %struct.timeval** %3
%7 = getelementptr inbounds %struct.timeval, %struct.timeval* %6, i32 0, i32 0
%8 = load i32, i32* %7
%9 = load %struct.timeval*, %struct.timeval** %4
%10 = getelementptr inbounds %struct.timeval, %struct.timeval* %9, i32 0, i32 0
%11 = load i32, i32* %10
%12 = sub nsw i32 %8, %11
store i32 %12, i32* %5
%13 = load i32, i32* %5
%14 = icmp eq i32 %13, 0
br i1 %14, label %15, label %23
15: ; preds = %2
%16 = load %struct.timeval*, %struct.timeval** %3
%17 = getelementptr inbounds %struct.timeval, %struct.timeval* %16, i32 0, i32 1
%18 = load i32, i32* %17
%19 = load %struct.timeval*, %struct.timeval** %4
%20 = getelementptr inbounds %struct.timeval, %struct.timeval* %19, i32 0, i32 1
%21 = load i32, i32* %20
%22 = sub nsw i32 %18, %21
store i32 %22, i32* %5
br label %23
23: ; preds = %15, %2
%24 = load i32, i32* %5
ret i32 %24
}

LLVM IR (-O2):
%struct.timeval = type { i32, i32 }
define i32 @compareTimeval(%struct.timeval* nocapture %0, %struct.timeval* nocapture %1) {
%3 = getelementptr inbounds %struct.timeval, %struct.timeval* %0, i64 0, i32 0
%4 = load i32, i32* %3
%5 = getelementptr inbounds %struct.timeval, %struct.timeval* %1, i64 0, i32 0
%6 = load i32, i32* %5
%7 = sub nsw i32 %4, %6
%8 = icmp eq i32 %7, 0
br i1 %8, label %9, label %15
9: ; preds = %2
%10 = getelementptr inbounds %struct.timeval, %struct.timeval* %0, i64 0, i32 1
%11 = load i32, i32* %10
%12 = getelementptr inbounds %struct.timeval, %struct.timeval* %1, i64 0, i32 1
%13 = load i32, i32* %12
%14 = sub nsw i32 %11, %13
br label %15
15: ; preds = %9, %2
%16 = phi i32 [ %14, %9 ], [ %7, %2 ]
ret i32 %16
}