#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 */
typedef int /*<<< orphan*/ time_t;
struct tm {
  int tm_year;
  int tm_mon;
  int tm_mday;
  int tm_hour;
  int tm_min;
  int tm_sec;
};

/* Variables and functions */
struct tm *localtime(int /*<<< orphan*/ *);
int /*<<< orphan*/ sprintf(char *, char *, int, int, int, int, int, int);
int /*<<< orphan*/ time(int /*<<< orphan*/ *);
char *rpi_sys_time() {
  static char data[256];
  time_t t = time(NULL);
  struct tm tm = *localtime(&t);
  sprintf(data, "%04d-%02d-%02d %02d:%02d:%02d", tm.tm_year + 1900,
          tm.tm_mon + 1, tm.tm_mday, tm.tm_hour, tm.tm_min, tm.tm_sec);
  return data;
}


x86 assembly (clang, -O0):
<rpi_sys_time>:
push   %rbp
mov    %rsp,%rbp
sub    $0x30,%rsp
xor    %eax,%eax
mov    %eax,%edi
call   1040 <time@plt>
mov    %eax,-0x4(%rbp)
lea    -0x4(%rbp),%rdi
call   1030 <localtime@plt>
mov    (%rax),%rcx
mov    %rcx,-0x20(%rbp)
mov    0x8(%rax),%rcx
mov    %rcx,-0x18(%rbp)
mov    0x10(%rax),%rax
mov    %rax,-0x10(%rbp)
mov    -0x20(%rbp),%edx
add    $0x76c,%edx
mov    -0x1c(%rbp),%ecx
add    $0x1,%ecx
mov    -0x18(%rbp),%r8d
mov    -0x14(%rbp),%r9d
mov    -0x10(%rbp),%r10d
mov    -0xc(%rbp),%eax
lea    0x2ec7(%rip),%rdi
lea    0xe70(%rip),%rsi
mov    %r10d,(%rsp)
mov    %eax,0x8(%rsp)
call   1050 <sprintf@plt>
lea    0x2eac(%rip),%rax
add    $0x30,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<rpi_sys_time>:
push   %r14
push   %rbx
push   %rax
xor    %edi,%edi
call   1040 <time@plt>
mov    %eax,0x4(%rsp)
lea    0x4(%rsp),%rdi
call   1030 <localtime@plt>
mov    0x4(%rax),%ecx
mov    0x8(%rax),%r8d
mov    0xc(%rax),%r9d
mov    0x10(%rax),%r10d
mov    0x14(%rax),%ebx
mov    $0x76c,%edx
add    (%rax),%edx
add    $0x1,%ecx
lea    0x2ee4(%rip),%r14
lea    0xe8d(%rip),%rsi
mov    %r14,%rdi
push   %rbx
push   %r10
call   1050 <sprintf@plt>
add    $0x10,%rsp
mov    %r14,%rax
add    $0x8,%rsp
pop    %rbx
pop    %r14
ret

LLVM IR (-O0):
%struct.tm = type { i32, i32, i32, i32, i32, i32 }
@rpi_sys_time.data = internal global [256 x i8] zeroinitializer
@.str = [30 x i8] c"%04d-%02d-%02d %02d:%02d:%02d\00"
define i8* @rpi_sys_time() {
%1 = alloca i32
%2 = alloca %struct.tm
%3 = call i32 @time(i32* null)
store i32 %3, i32* %1
%4 = call %struct.tm* @localtime(i32* %1)
%5 = bitcast %struct.tm* %2 to i8*
%6 = bitcast %struct.tm* %4 to i8*
%7 = getelementptr inbounds %struct.tm, %struct.tm* %2, i32 0, i32 0
%8 = load i32, i32* %7
%9 = add nsw i32 %8, 1900
%10 = getelementptr inbounds %struct.tm, %struct.tm* %2, i32 0, i32 1
%11 = load i32, i32* %10
%12 = add nsw i32 %11, 1
%13 = getelementptr inbounds %struct.tm, %struct.tm* %2, i32 0, i32 2
%14 = load i32, i32* %13
%15 = getelementptr inbounds %struct.tm, %struct.tm* %2, i32 0, i32 3
%16 = load i32, i32* %15
%17 = getelementptr inbounds %struct.tm, %struct.tm* %2, i32 0, i32 4
%18 = load i32, i32* %17
%19 = getelementptr inbounds %struct.tm, %struct.tm* %2, i32 0, i32 5
%20 = load i32, i32* %19
%21 = call i32 @sprintf(i8* getelementptr inbounds ([256 x i8], [256 x i8]* @rpi_sys_time.data, i64 0, i64 0), i8* getelementptr inbounds ([30 x i8], [30 x i8]* @.str, i64 0, i64 0), i32 %9, i32 %12, i32 %14, i32 %16, i32 %18, i32 %20)
ret i8* getelementptr inbounds ([256 x i8], [256 x i8]* @rpi_sys_time.data, i64 0, i64 0)
}

LLVM IR (-O2):
%struct.tm = type { i32, i32, i32, i32, i32, i32 }
@rpi_sys_time.data = internal global [256 x i8] zeroinitializer
@.str = [30 x i8] c"%04d-%02d-%02d %02d:%02d:%02d\00"
define i8* @rpi_sys_time() {
%1 = alloca i32
%2 = bitcast i32* %1 to i8*
%3 = tail call i32 @time(i32* null)
store i32 %3, i32* %1
%4 = call %struct.tm* @localtime(i32* %1)
%5 = getelementptr inbounds %struct.tm, %struct.tm* %4, i64 0, i32 0
%6 = load i32, i32* %5
%7 = getelementptr inbounds %struct.tm, %struct.tm* %4, i64 0, i32 1
%8 = load i32, i32* %7
%9 = getelementptr inbounds %struct.tm, %struct.tm* %4, i64 0, i32 2
%10 = load i32, i32* %9
%11 = getelementptr inbounds %struct.tm, %struct.tm* %4, i64 0, i32 3
%12 = load i32, i32* %11
%13 = getelementptr inbounds %struct.tm, %struct.tm* %4, i64 0, i32 4
%14 = load i32, i32* %13
%15 = getelementptr inbounds %struct.tm, %struct.tm* %4, i64 0, i32 5
%16 = load i32, i32* %15
%17 = add nsw i32 %6, 1900
%18 = add nsw i32 %8, 1
%19 = call i32 @sprintf(i8* dereferenceable(1) getelementptr inbounds ([256 x i8], [256 x i8]* @rpi_sys_time.data, i64 0, i64 0), i8* dereferenceable(1) getelementptr inbounds ([30 x i8], [30 x i8]* @.str, i64 0, i64 0), i32 %17, i32 %18, i32 %10, i32 %12, i32 %14, i32 %16)
ret i8* getelementptr inbounds ([256 x i8], [256 x i8]* @rpi_sys_time.data, i64 0, i64 0)
}