#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_usec;
  scalar_t__ tv_sec;
};
typedef int int64_t;

/* Variables and functions */
int /*<<< orphan*/ abort();
scalar_t__ gettimeofday(struct timeval *, int /*<<< orphan*/ *);
int /*<<< orphan*/ perror(char *);
int64_t getMicrosecondTimeStamp() {
  int64_t retval;
  struct timeval tv;
  if (gettimeofday(&tv, NULL)) {
    perror("gettimeofday");
    abort();
  }
  retval = ((int64_t)tv.tv_sec) * 1000000 + tv.tv_usec;
  return retval;
}


x86 assembly (clang, -O0):
<getMicrosecondTimeStamp>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
lea    -0x18(%rbp),%rdi
xor    %eax,%eax
mov    %eax,%esi
call   1040 <gettimeofday@plt>
cmp    $0x0,%rax
je     1162 <getMicrosecondTimeStamp+0x32>
lea    0xeaa(%rip),%rdi
call   1050 <perror@plt>
mov    $0x0,%al
call   1030 <abort@plt>
mov    -0x10(%rbp),%rax
imul   $0xf4240,%eax,%eax
add    -0x18(%rbp),%eax
mov    %eax,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<getMicrosecondTimeStamp>:
sub    $0x18,%rsp
lea    0x8(%rsp),%rdi
xor    %esi,%esi
call   1040 <gettimeofday@plt>
test   %rax,%rax
jne    1156 <getMicrosecondTimeStamp+0x26>
imul   $0xf4240,0x10(%rsp),%eax
add    0x8(%rsp),%eax
add    $0x18,%rsp
ret
lea    0xea3(%rip),%rdi
call   1050 <perror@plt>
xor    %eax,%eax
call   1030 <abort@plt>

LLVM IR (-O0):
%struct.timeval = type { i32, i64 }
@.str = [13 x i8] c"gettimeofday\00"
define i32 @getMicrosecondTimeStamp() {
%1 = alloca i32
%2 = alloca %struct.timeval
%3 = call i64 @gettimeofday(%struct.timeval* %2, i32* null)
%4 = icmp ne i64 %3, 0
br i1 %4, label %5, label %8
5: ; preds = %0
%6 = call i32 @perror(i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str, i64 0, i64 0))
%7 = call i32 (...) @abort()
unreachable
8: ; preds = %0
%9 = getelementptr inbounds %struct.timeval, %struct.timeval* %2, i32 0, i32 1
%10 = load i64, i64* %9
%11 = trunc i64 %10 to i32
%12 = mul nsw i32 %11, 1000000
%13 = getelementptr inbounds %struct.timeval, %struct.timeval* %2, i32 0, i32 0
%14 = load i32, i32* %13
%15 = add nsw i32 %12, %14
store i32 %15, i32* %1
%16 = load i32, i32* %1
ret i32 %16
}

LLVM IR (-O2):
%struct.timeval = type { i32, i64 }
@.str = [13 x i8] c"gettimeofday\00"
define i32 @getMicrosecondTimeStamp() {
%1 = alloca %struct.timeval
%2 = bitcast %struct.timeval* %1 to i8*
%3 = call i64 @gettimeofday(%struct.timeval* %1, i32* null)
%4 = icmp eq i64 %3, 0
br i1 %4, label %8, label %5
5: ; preds = %0
%6 = tail call i32 @perror(i8* getelementptr inbounds ([13 x i8], [13 x i8]* @.str, i64 0, i64 0))
%7 = tail call i32 (...) @abort()
unreachable
8: ; preds = %0
%9 = getelementptr inbounds %struct.timeval, %struct.timeval* %1, i64 0, i32 1
%10 = load i64, i64* %9
%11 = trunc i64 %10 to i32
%12 = mul nsw i32 %11, 1000000
%13 = getelementptr inbounds %struct.timeval, %struct.timeval* %1, i64 0, i32 0
%14 = load i32, i32* %13
%15 = add nsw i32 %12, %14
ret i32 %15
}