#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 tm {
  int tm_year;
  int tm_mon;
  int tm_mday;
  int tm_hour;
  int tm_min;
  int tm_sec;
};
struct timeval {
  int tv_usec;
  int /*<<< orphan*/ tv_sec;
};

/* Variables and functions */
int /*<<< orphan*/ gettimeofday(struct timeval *, int /*<<< orphan*/ *);
struct tm *localtime(int /*<<< orphan*/ *);
int /*<<< orphan*/ sprintf(char *, char *, int, int, int, int, int, int, int);
void get_now_str(char *s_time) {
  struct tm *tmp;
  struct timeval tv;
  gettimeofday(&tv, NULL);
  tmp = localtime(&tv.tv_sec);
  sprintf(s_time, "%04d/%02d/%02d %02d:%02d:%02d.%3d", tmp->tm_year + 1900,
          tmp->tm_mon + 1, tmp->tm_mday, tmp->tm_hour, tmp->tm_min, tmp->tm_sec,
          tv.tv_usec / 1000);
}


x86 assembly (clang, -O0):
<get_now_str>:
push   %rbp
mov    %rsp,%rbp
sub    $0x40,%rsp
mov    %rdi,-0x8(%rbp)
lea    -0x18(%rbp),%rdi
xor    %eax,%eax
mov    %eax,%esi
call   1040 <gettimeofday@plt>
lea    -0x18(%rbp),%rdi
add    $0x4,%rdi
call   1030 <localtime@plt>
mov    %rax,-0x10(%rbp)
mov    -0x8(%rbp),%rdi
mov    -0x10(%rbp),%rax
mov    (%rax),%eax
add    $0x76c,%eax
mov    %eax,-0x1c(%rbp)
mov    -0x10(%rbp),%rax
mov    0x4(%rax),%ecx
add    $0x1,%ecx
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%r8d
mov    -0x10(%rbp),%rax
mov    0xc(%rax),%r9d
mov    -0x10(%rbp),%rax
mov    0x10(%rax),%r11d
mov    -0x10(%rbp),%rax
mov    0x14(%rax),%r10d
mov    -0x18(%rbp),%eax
mov    $0x3e8,%esi
cltd
idiv   %esi
mov    -0x1c(%rbp),%edx
lea    0xe55(%rip),%rsi
mov    %r11d,(%rsp)
mov    %r10d,0x8(%rsp)
mov    %eax,0x10(%rsp)
call   1050 <sprintf@plt>
add    $0x40,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<get_now_str>:
push   %r14
push   %rbx
push   %rax
mov    %rdi,%r14
mov    %rsp,%rdi
xor    %esi,%esi
call   1040 <gettimeofday@plt>
lea    0x4(%rsp),%rdi
call   1030 <localtime@plt>
mov    $0x76c,%edx
add    (%rax),%edx
mov    0x4(%rax),%ecx
mov    0x8(%rax),%r8d
add    $0x1,%ecx
mov    0xc(%rax),%r9d
mov    0x10(%rax),%r10d
mov    0x14(%rax),%eax
movslq (%rsp),%rsi
imul   $0x10624dd3,%rsi,%rbx
mov    %rbx,%rsi
shr    $0x3f,%rsi
sar    $0x26,%rbx
add    %esi,%ebx
sub    $0x8,%rsp
lea    0xe76(%rip),%rsi
mov    %r14,%rdi
push   %rbx
push   %rax
push   %r10
call   1050 <sprintf@plt>
add    $0x28,%rsp
pop    %rbx
pop    %r14
ret

LLVM IR (-O0):
%struct.tm = type { i32, i32, i32, i32, i32, i32 }
%struct.timeval = type { i32, i32 }
@.str = [34 x i8] c"%04d/%02d/%02d %02d:%02d:%02d.%3d\00"
define void @get_now_str(i8* %0) {
%2 = alloca i8*
%3 = alloca %struct.tm*
%4 = alloca %struct.timeval
store i8* %0, i8** %2
%5 = call i32 @gettimeofday(%struct.timeval* %4, i32* null)
%6 = getelementptr inbounds %struct.timeval, %struct.timeval* %4, i32 0, i32 1
%7 = call %struct.tm* @localtime(i32* %6)
store %struct.tm* %7, %struct.tm** %3
%8 = load i8*, i8** %2
%9 = load %struct.tm*, %struct.tm** %3
%10 = getelementptr inbounds %struct.tm, %struct.tm* %9, i32 0, i32 0
%11 = load i32, i32* %10
%12 = add nsw i32 %11, 1900
%13 = load %struct.tm*, %struct.tm** %3
%14 = getelementptr inbounds %struct.tm, %struct.tm* %13, i32 0, i32 1
%15 = load i32, i32* %14
%16 = add nsw i32 %15, 1
%17 = load %struct.tm*, %struct.tm** %3
%18 = getelementptr inbounds %struct.tm, %struct.tm* %17, i32 0, i32 2
%19 = load i32, i32* %18
%20 = load %struct.tm*, %struct.tm** %3
%21 = getelementptr inbounds %struct.tm, %struct.tm* %20, i32 0, i32 3
%22 = load i32, i32* %21
%23 = load %struct.tm*, %struct.tm** %3
%24 = getelementptr inbounds %struct.tm, %struct.tm* %23, i32 0, i32 4
%25 = load i32, i32* %24
%26 = load %struct.tm*, %struct.tm** %3
%27 = getelementptr inbounds %struct.tm, %struct.tm* %26, i32 0, i32 5
%28 = load i32, i32* %27
%29 = getelementptr inbounds %struct.timeval, %struct.timeval* %4, i32 0, i32 0
%30 = load i32, i32* %29
%31 = sdiv i32 %30, 1000
%32 = call i32 @sprintf(i8* %8, i8* getelementptr inbounds ([34 x i8], [34 x i8]* @.str, i64 0, i64 0), i32 %12, i32 %16, i32 %19, i32 %22, i32 %25, i32 %28, i32 %31)
ret void
}

LLVM IR (-O2):
%struct.timeval = type { i32, i32 }
%struct.tm = type { i32, i32, i32, i32, i32, i32 }
@.str = [34 x i8] c"%04d/%02d/%02d %02d:%02d:%02d.%3d\00"
define void @get_now_str(i8* nocapture writeonly %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 1
%6 = call %struct.tm* @localtime(i32* %5)
%7 = getelementptr inbounds %struct.tm, %struct.tm* %6, i64 0, i32 0
%8 = load i32, i32* %7
%9 = add nsw i32 %8, 1900
%10 = getelementptr inbounds %struct.tm, %struct.tm* %6, i64 0, i32 1
%11 = load i32, i32* %10
%12 = add nsw i32 %11, 1
%13 = getelementptr inbounds %struct.tm, %struct.tm* %6, i64 0, i32 2
%14 = load i32, i32* %13
%15 = getelementptr inbounds %struct.tm, %struct.tm* %6, i64 0, i32 3
%16 = load i32, i32* %15
%17 = getelementptr inbounds %struct.tm, %struct.tm* %6, i64 0, i32 4
%18 = load i32, i32* %17
%19 = getelementptr inbounds %struct.tm, %struct.tm* %6, i64 0, i32 5
%20 = load i32, i32* %19
%21 = getelementptr inbounds %struct.timeval, %struct.timeval* %2, i64 0, i32 0
%22 = load i32, i32* %21
%23 = sdiv i32 %22, 1000
%24 = call i32 @sprintf(i8* dereferenceable(1) %0, i8* dereferenceable(1) getelementptr inbounds ([34 x i8], [34 x i8]* @.str, i64 0, i64 0), i32 %9, i32 %12, i32 %14, i32 %16, i32 %18, i32 %20, i32 %23)
ret void
}