#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 dummy;
};
typedef int /*<<< orphan*/ buffer;
typedef int /*<<< orphan*/ FILE;

/* Variables and functions */
int /*<<< orphan*/ fprintf(int /*<<< orphan*/ *, char *, char *);
struct tm *gmtime(int /*<<< orphan*/ *);
int /*<<< orphan*/ strftime(char *, int, char *, struct tm *);
int /*<<< orphan*/ time(int /*<<< orphan*/);
void log_time(FILE *stream) {
  char buffer[30];
  struct tm *str_time;
  time_t now = time(0);
  str_time = gmtime(&now);
  strftime(buffer, sizeof(buffer), "%Y-%m-%d %H:%M:%S ", str_time);
  fprintf(stream, "%s ", buffer);
}


x86 assembly (clang, -O0):
<log_time>:
push   %rbp
mov    %rsp,%rbp
sub    $0x40,%rsp
mov    %rdi,-0x8(%rbp)
xor    %edi,%edi
call   1040 <time@plt>
mov    %eax,-0x3c(%rbp)
lea    -0x3c(%rbp),%rdi
call   1060 <gmtime@plt>
mov    %rax,-0x38(%rbp)
lea    -0x30(%rbp),%rdi
mov    -0x38(%rbp),%rcx
mov    $0x1e,%esi
lea    0xe89(%rip),%rdx
call   1050 <strftime@plt>
mov    -0x8(%rbp),%rdi
lea    -0x30(%rbp),%rdx
lea    0xe88(%rip),%rsi
call   1030 <fprintf@plt>
add    $0x40,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<log_time>:
push   %r14
push   %rbx
sub    $0x38,%rsp
mov    %rdi,%r14
xor    %edi,%edi
call   1040 <time@plt>
mov    %eax,0xc(%rsp)
lea    0xc(%rsp),%rdi
call   1060 <gmtime@plt>
lea    0xe9a(%rip),%rdx
lea    0x10(%rsp),%rbx
mov    %rbx,%rdi
mov    $0x1e,%esi
mov    %rax,%rcx
call   1050 <strftime@plt>
lea    0xe91(%rip),%rsi
mov    %r14,%rdi
mov    %rbx,%rdx
call   1030 <fprintf@plt>
add    $0x38,%rsp
pop    %rbx
pop    %r14
ret

LLVM IR (-O0):
%struct.tm = type { i32 }
@.str = [19 x i8] c"%Y-%m-%d %H:%M:%S \00"
@.str.1 = [4 x i8] c"%s \00"
define void @log_time(i32* %0) {
%2 = alloca i32*
%3 = alloca [30 x i8]
%4 = alloca %struct.tm*
%5 = alloca i32
store i32* %0, i32** %2
%6 = call i32 @time(i32 0)
store i32 %6, i32* %5
%7 = call %struct.tm* @gmtime(i32* %5)
store %struct.tm* %7, %struct.tm** %4
%8 = getelementptr inbounds [30 x i8], [30 x i8]* %3, i64 0, i64 0
%9 = load %struct.tm*, %struct.tm** %4
%10 = call i32 @strftime(i8* %8, i32 30, i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str, i64 0, i64 0), %struct.tm* %9)
%11 = load i32*, i32** %2
%12 = getelementptr inbounds [30 x i8], [30 x i8]* %3, i64 0, i64 0
%13 = call i32 @fprintf(i32* %11, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i8* %12)
ret void
}

LLVM IR (-O2):
%struct.tm = type { i32 }
@.str = [19 x i8] c"%Y-%m-%d %H:%M:%S \00"
@.str.1 = [4 x i8] c"%s \00"
define void @log_time(i32* nocapture %0) {
%2 = alloca [30 x i8]
%3 = alloca i32
%4 = getelementptr inbounds [30 x i8], [30 x i8]* %2, i64 0, i64 0
%5 = bitcast i32* %3 to i8*
%6 = tail call i32 @time(i32 0)
store i32 %6, i32* %3
%7 = call %struct.tm* @gmtime(i32* %3)
%8 = call i32 @strftime(i8* %4, i32 30, i8* getelementptr inbounds ([19 x i8], [19 x i8]* @.str, i64 0, i64 0), %struct.tm* %7)
%9 = call i32 @fprintf(i32* %0, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i8* %4)
ret void
}