#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;
};
typedef scalar_t__ int32_t;

/* Variables and functions */
struct timeval tv_diff(struct timeval *t0, struct timeval *t1) {
  struct timeval tv;
  int32_t t0_us = t0->tv_usec;
  int32_t t1_us = t1->tv_usec;
  int32_t tr_us;
  tv.tv_sec = t1->tv_sec - t0->tv_sec;
  tr_us = t1_us - t0_us;
  if (tr_us < 0) {
    tv.tv_sec--;
    tv.tv_usec = 1000000l + tr_us;
  } else
    tv.tv_usec = tr_us;
  return tv;
}


x86 assembly (clang, -O0):
<tv_diff>:
push   %rbp
mov    %rsp,%rbp
mov    %rdi,-0x18(%rbp)
mov    %rsi,-0x20(%rbp)
mov    -0x18(%rbp),%rax
mov    (%rax),%rax
mov    %rax,-0x28(%rbp)
mov    -0x20(%rbp),%rax
mov    (%rax),%rax
mov    %rax,-0x30(%rbp)
mov    -0x20(%rbp),%rax
mov    0x8(%rax),%rax
mov    -0x18(%rbp),%rcx
sub    0x8(%rcx),%rax
mov    %rax,-0x8(%rbp)
mov    -0x30(%rbp),%rax
sub    -0x28(%rbp),%rax
mov    %rax,-0x38(%rbp)
cmpq   $0x0,-0x38(%rbp)
jge    116c <tv_diff+0x6c>
mov    -0x8(%rbp),%rax
add    $0xffffffffffffffff,%rax
mov    %rax,-0x8(%rbp)
mov    -0x38(%rbp),%rax
add    $0xf4240,%rax
mov    %rax,-0x10(%rbp)
jmp    1174 <tv_diff+0x74>
mov    -0x38(%rbp),%rax
mov    %rax,-0x10(%rbp)
mov    -0x10(%rbp),%rax
mov    -0x8(%rbp),%rdx
pop    %rbp
ret

x86 assembly (clang, -O2):
<tv_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 } @tv_diff(%struct.timeval* %0, %struct.timeval* %1) {
%3 = alloca %struct.timeval
%4 = alloca %struct.timeval*
%5 = alloca %struct.timeval*
%6 = alloca i64
%7 = alloca i64
%8 = alloca i64
store %struct.timeval* %0, %struct.timeval** %4
store %struct.timeval* %1, %struct.timeval** %5
%9 = load %struct.timeval*, %struct.timeval** %4
%10 = getelementptr inbounds %struct.timeval, %struct.timeval* %9, i32 0, i32 0
%11 = load i64, i64* %10
store i64 %11, i64* %6
%12 = load %struct.timeval*, %struct.timeval** %5
%13 = getelementptr inbounds %struct.timeval, %struct.timeval* %12, i32 0, i32 0
%14 = load i64, i64* %13
store i64 %14, i64* %7
%15 = load %struct.timeval*, %struct.timeval** %5
%16 = getelementptr inbounds %struct.timeval, %struct.timeval* %15, i32 0, i32 1
%17 = load i64, i64* %16
%18 = load %struct.timeval*, %struct.timeval** %4
%19 = getelementptr inbounds %struct.timeval, %struct.timeval* %18, i32 0, i32 1
%20 = load i64, i64* %19
%21 = sub nsw i64 %17, %20
%22 = getelementptr inbounds %struct.timeval, %struct.timeval* %3, i32 0, i32 1
store i64 %21, i64* %22
%23 = load i64, i64* %7
%24 = load i64, i64* %6
%25 = sub nsw i64 %23, %24
store i64 %25, i64* %8
%26 = load i64, i64* %8
%27 = icmp slt i64 %26, 0
br i1 %27, label %28, label %35
28: ; preds = %2
%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
%32 = load i64, i64* %8
%33 = add nsw i64 1000000, %32
%34 = getelementptr inbounds %struct.timeval, %struct.timeval* %3, i32 0, i32 0
store i64 %33, i64* %34
br label %38
35: ; preds = %2
%36 = load i64, i64* %8
%37 = getelementptr inbounds %struct.timeval, %struct.timeval* %3, i32 0, i32 0
store i64 %36, i64* %37
br label %38
38: ; preds = %35, %28
%39 = bitcast %struct.timeval* %3 to { i64, i64 }*
%40 = load { i64, i64 }, { i64, i64 }* %39
ret { i64, i64 } %40
}

LLVM IR (-O2):
%struct.timeval = type { i64, i64 }
define { i64, i64 } @tv_diff(%struct.timeval* nocapture %0, %struct.timeval* nocapture %1) {
%3 = getelementptr inbounds %struct.timeval, %struct.timeval* %0, i64 0, i32 0
%4 = load i64, i64* %3
%5 = getelementptr inbounds %struct.timeval, %struct.timeval* %1, i64 0, i32 0
%6 = load i64, i64* %5
%7 = getelementptr inbounds %struct.timeval, %struct.timeval* %1, i64 0, i32 1
%8 = load i64, i64* %7
%9 = getelementptr inbounds %struct.timeval, %struct.timeval* %0, i64 0, i32 1
%10 = load i64, i64* %9
%11 = sub i64 %8, %10
%12 = sub nsw i64 %6, %4
%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 %11, %16
%18 = insertvalue { i64, i64 } poison, i64 %15, 0
%19 = insertvalue { i64, i64 } %18, i64 %17, 1
ret { i64, i64 } %19
}