#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 /*<<< orphan*/ gettimeofday(struct timeval *, int /*<<< orphan*/ *);
int elapsed_time(struct timeval *starttime) {
  struct timeval tv;
  gettimeofday(&tv, NULL);
  return (int)(((tv.tv_sec - starttime->tv_sec) * 1000) +
               ((tv.tv_usec - starttime->tv_usec) / 1000));
}


x86 assembly (clang, -O0):
<elapsed_time>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x8(%rbp)
lea    -0x10(%rbp),%rdi
xor    %eax,%eax
mov    %eax,%esi
call   1030 <gettimeofday@plt>
mov    -0x10(%rbp),%eax
mov    -0x8(%rbp),%rcx
sub    (%rcx),%eax
imul   $0x3e8,%eax,%eax
mov    %eax,-0x14(%rbp)
mov    -0xc(%rbp),%eax
mov    -0x8(%rbp),%rcx
sub    0x4(%rcx),%eax
mov    $0x3e8,%ecx
cltd
idiv   %ecx
mov    %eax,%ecx
mov    -0x14(%rbp),%eax
add    %ecx,%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<elapsed_time>:
push   %rbx
sub    $0x10,%rsp
mov    %rdi,%rbx
lea    0x8(%rsp),%rdi
xor    %esi,%esi
call   1030 <gettimeofday@plt>
mov    0x8(%rsp),%eax
mov    0xc(%rsp),%ecx
sub    (%rbx),%eax
imul   $0x3e8,%eax,%edx
sub    0x4(%rbx),%ecx
movslq %ecx,%rax
imul   $0x10624dd3,%rax,%rax
mov    %rax,%rcx
shr    $0x3f,%rcx
sar    $0x26,%rax
add    %ecx,%eax
add    %edx,%eax
add    $0x10,%rsp
pop    %rbx
ret

LLVM IR (-O0):
%struct.timeval = type { i32, i32 }
define i32 @elapsed_time(%struct.timeval* %0) {
%2 = alloca %struct.timeval*
%3 = alloca %struct.timeval
store %struct.timeval* %0, %struct.timeval** %2
%4 = call i32 @gettimeofday(%struct.timeval* %3, i32* null)
%5 = getelementptr inbounds %struct.timeval, %struct.timeval* %3, i32 0, i32 0
%6 = load i32, i32* %5
%7 = load %struct.timeval*, %struct.timeval** %2
%8 = getelementptr inbounds %struct.timeval, %struct.timeval* %7, i32 0, i32 0
%9 = load i32, i32* %8
%10 = sub nsw i32 %6, %9
%11 = mul nsw i32 %10, 1000
%12 = getelementptr inbounds %struct.timeval, %struct.timeval* %3, i32 0, i32 1
%13 = load i32, i32* %12
%14 = load %struct.timeval*, %struct.timeval** %2
%15 = getelementptr inbounds %struct.timeval, %struct.timeval* %14, i32 0, i32 1
%16 = load i32, i32* %15
%17 = sub nsw i32 %13, %16
%18 = sdiv i32 %17, 1000
%19 = add nsw i32 %11, %18
ret i32 %19
}

LLVM IR (-O2):
%struct.timeval = type { i32, i32 }
define i32 @elapsed_time(%struct.timeval* nocapture %0) {
%2 = alloca %struct.timeval
%3 = bitcast %struct.timeval* %2 to i8*
%4 = call i32 @gettimeofday(%struct.timeval* %2, i32* null)
%5 = getelementptr inbounds %struct.timeval, %struct.timeval* %2, i64 0, i32 0
%6 = load i32, i32* %5
%7 = getelementptr inbounds %struct.timeval, %struct.timeval* %0, i64 0, i32 0
%8 = load i32, i32* %7
%9 = sub nsw i32 %6, %8
%10 = mul nsw i32 %9, 1000
%11 = getelementptr inbounds %struct.timeval, %struct.timeval* %2, i64 0, i32 1
%12 = load i32, i32* %11
%13 = getelementptr inbounds %struct.timeval, %struct.timeval* %0, i64 0, i32 1
%14 = load i32, i32* %13
%15 = sub nsw i32 %12, %14
%16 = sdiv i32 %15, 1000
%17 = add nsw i32 %16, %10
ret i32 %17
}