#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 {
  scalar_t__ tv_usec;
  scalar_t__ tv_sec;
};

/* Variables and functions */
struct timeval time_diff(struct timeval *before, struct timeval *after) {
  struct timeval diff;
  diff.tv_sec = after->tv_sec - before->tv_sec;
  diff.tv_usec = after->tv_usec - before->tv_usec;
  if (diff.tv_usec < 0) {
    diff.tv_usec += 1000000;
    diff.tv_sec--;
  }
  return diff;
}


x86 assembly (clang, -O0):
<time_diff>:
push   %rbp
mov    %rsp,%rbp
mov    %rdi,-0x18(%rbp)
mov    %rsi,-0x20(%rbp)
mov    -0x20(%rbp),%rax
mov    0x8(%rax),%rax
mov    -0x18(%rbp),%rcx
sub    0x8(%rcx),%rax
mov    %rax,-0x8(%rbp)
mov    -0x20(%rbp),%rax
mov    (%rax),%rax
mov    -0x18(%rbp),%rcx
sub    (%rcx),%rax
mov    %rax,-0x10(%rbp)
cmpq   $0x0,-0x10(%rbp)
jge    1157 <time_diff+0x57>
mov    -0x10(%rbp),%rax
add    $0xf4240,%rax
mov    %rax,-0x10(%rbp)
mov    -0x8(%rbp),%rax
add    $0xffffffffffffffff,%rax
mov    %rax,-0x8(%rbp)
mov    -0x10(%rbp),%rax
mov    -0x8(%rbp),%rdx
pop    %rbp
ret

x86 assembly (clang, -O2):
<time_diff>:
mov    (%rsi),%rdx
mov    0x8(%rsi),%rcx
sub    0x8(%rdi),%rcx
sub    (%rdi),%rdx
lea    0xf4240(%rdx),%rax
test   %rdx,%rdx
cmovns %rdx,%rax
sar    $0x3f,%rdx
add    %rcx,%rdx
ret

LLVM IR (-O0):
%struct.timeval = type { i64, i64 }
define { i64, i64 } @time_diff(%struct.timeval* %0, %struct.timeval* %1) {
%3 = alloca %struct.timeval
%4 = alloca %struct.timeval*
%5 = alloca %struct.timeval*
store %struct.timeval* %0, %struct.timeval** %4
store %struct.timeval* %1, %struct.timeval** %5
%6 = load %struct.timeval*, %struct.timeval** %5
%7 = getelementptr inbounds %struct.timeval, %struct.timeval* %6, i32 0, i32 1
%8 = load i64, i64* %7
%9 = load %struct.timeval*, %struct.timeval** %4
%10 = getelementptr inbounds %struct.timeval, %struct.timeval* %9, i32 0, i32 1
%11 = load i64, i64* %10
%12 = sub nsw i64 %8, %11
%13 = getelementptr inbounds %struct.timeval, %struct.timeval* %3, i32 0, i32 1
store i64 %12, i64* %13
%14 = load %struct.timeval*, %struct.timeval** %5
%15 = getelementptr inbounds %struct.timeval, %struct.timeval* %14, i32 0, i32 0
%16 = load i64, i64* %15
%17 = load %struct.timeval*, %struct.timeval** %4
%18 = getelementptr inbounds %struct.timeval, %struct.timeval* %17, i32 0, i32 0
%19 = load i64, i64* %18
%20 = sub nsw i64 %16, %19
%21 = getelementptr inbounds %struct.timeval, %struct.timeval* %3, i32 0, i32 0
store i64 %20, i64* %21
%22 = getelementptr inbounds %struct.timeval, %struct.timeval* %3, i32 0, i32 0
%23 = load i64, i64* %22
%24 = icmp slt i64 %23, 0
br i1 %24, label %25, label %32
25: ; preds = %2
%26 = getelementptr inbounds %struct.timeval, %struct.timeval* %3, i32 0, i32 0
%27 = load i64, i64* %26
%28 = add nsw i64 %27, 1000000
store i64 %28, i64* %26
%29 = getelementptr inbounds %struct.timeval, %struct.timeval* %3, i32 0, i32 1
%30 = load i64, i64* %29
%31 = add nsw i64 %30, -1
store i64 %31, i64* %29
br label %32
32: ; preds = %25, %2
%33 = bitcast %struct.timeval* %3 to { i64, i64 }*
%34 = load { i64, i64 }, { i64, i64 }* %33
ret { i64, i64 } %34
}

LLVM IR (-O2):
%struct.timeval = type { i64, i64 }
define { i64, i64 } @time_diff(%struct.timeval* nocapture %0, %struct.timeval* nocapture %1) {
%3 = getelementptr inbounds %struct.timeval, %struct.timeval* %1, i64 0, i32 1
%4 = load i64, i64* %3
%5 = getelementptr inbounds %struct.timeval, %struct.timeval* %0, i64 0, i32 1
%6 = load i64, i64* %5
%7 = sub i64 %4, %6
%8 = getelementptr inbounds %struct.timeval, %struct.timeval* %1, i64 0, i32 0
%9 = load i64, i64* %8
%10 = getelementptr inbounds %struct.timeval, %struct.timeval* %0, i64 0, i32 0
%11 = load i64, i64* %10
%12 = sub nsw i64 %9, %11
%13 = icmp slt i64 %12, 0
%14 = add nsw i64 %12, 1000000
%15 = select i1 %13, i64 %14, i64 %12
%16 = ashr i64 %12, 63
%17 = add nsw i64 %7, %16
%18 = insertvalue { i64, i64 } poison, i64 %15, 0
%19 = insertvalue { i64, i64 } %18, i64 %17, 1
ret { i64, i64 } %19
}