#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 */

/* Variables and functions */
int /*<<< orphan*/ _copy(char *, char *);
int _getline(char *);
int /*<<< orphan*/ printf(char *, int, char *);
int main(int argc, char *argv[]) {
  int max = 0;
  int length = 0;
  char line[1000];
  char maxline[1000];
  while ((length = _getline(line)) > 0) {
    if (length > max) {
      _copy(line, maxline);
      max = length;
    }
  }
  if (max > 0) {
    printf("The input max line(length:%d) is: %s\n", max, maxline);
  }
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x7f0,%rsp
movl   $0x0,-0x4(%rbp)
mov    %edi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
movl   $0x0,-0x14(%rbp)
movl   $0x0,-0x18(%rbp)
lea    -0x400(%rbp),%rdi
call   1050 <_getline@plt>
mov    %eax,-0x18(%rbp)
cmp    $0x0,%eax
jle    1199 <main+0x69>
mov    -0x18(%rbp),%eax
cmp    -0x14(%rbp),%eax
jle    1194 <main+0x64>
lea    -0x400(%rbp),%rdi
lea    -0x7f0(%rbp),%rsi
call   1040 <_copy@plt>
mov    -0x18(%rbp),%eax
mov    %eax,-0x14(%rbp)
jmp    1157 <main+0x27>
cmpl   $0x0,-0x14(%rbp)
jle    11b9 <main+0x89>
mov    -0x14(%rbp),%esi
lea    -0x7f0(%rbp),%rdx
lea    0xe4c(%rip),%rdi
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x7f0,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbp
push   %r15
push   %r14
push   %rbx
sub    $0x7d8,%rsp
lea    0x3f0(%rsp),%rdi
call   1050 <_getline@plt>
test   %eax,%eax
jle    1196 <main+0x66>
mov    %eax,%ebp
xor    %ebx,%ebx
lea    0x3f0(%rsp),%r14
mov    %rsp,%r15
jmp    116e <main+0x3e>
nop
mov    %r14,%rdi
call   1050 <_getline@plt>
mov    %eax,%ebp
test   %eax,%eax
jle    1181 <main+0x51>
cmp    %ebx,%ebp
jle    1160 <main+0x30>
mov    %r14,%rdi
mov    %r15,%rsi
call   1040 <_copy@plt>
mov    %ebp,%ebx
jmp    1160 <main+0x30>
test   %ebx,%ebx
jle    1196 <main+0x66>
lea    0xe74(%rip),%rdi
mov    %rsp,%rdx
mov    %ebx,%esi
call   1030 <printf@plt>
xor    %eax,%eax
add    $0x7d8,%rsp
pop    %rbx
pop    %r14
pop    %r15
pop    %rbp
ret

LLVM IR (-O0):
@.str = [38 x i8] c"The input max line(length:%d) is: %s\0A\00"
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
%6 = alloca i32
%7 = alloca i32
%8 = alloca [1000 x i8]
%9 = alloca [1000 x i8]
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
store i32 0, i32* %6
store i32 0, i32* %7
br label %10
10: ; preds = %23, %2
%11 = getelementptr inbounds [1000 x i8], [1000 x i8]* %8, i64 0, i64 0
%12 = call i32 @_getline(i8* %11)
store i32 %12, i32* %7
%13 = icmp sgt i32 %12, 0
br i1 %13, label %14, label %24
14: ; preds = %10
%15 = load i32, i32* %7
%16 = load i32, i32* %6
%17 = icmp sgt i32 %15, %16
br i1 %17, label %18, label %23
18: ; preds = %14
%19 = getelementptr inbounds [1000 x i8], [1000 x i8]* %8, i64 0, i64 0
%20 = getelementptr inbounds [1000 x i8], [1000 x i8]* %9, i64 0, i64 0
%21 = call i32 @_copy(i8* %19, i8* %20)
%22 = load i32, i32* %7
store i32 %22, i32* %6
br label %23
23: ; preds = %18, %14
br label %10
24: ; preds = %10
%25 = load i32, i32* %6
%26 = icmp sgt i32 %25, 0
br i1 %26, label %27, label %31
27: ; preds = %24
%28 = load i32, i32* %6
%29 = getelementptr inbounds [1000 x i8], [1000 x i8]* %9, i64 0, i64 0
%30 = call i32 @printf(i8* getelementptr inbounds ([38 x i8], [38 x i8]* @.str, i64 0, i64 0), i32 %28, i8* %29)
br label %31
31: ; preds = %27, %24
ret i32 0
}

LLVM IR (-O2):
@.str = [38 x i8] c"The input max line(length:%d) is: %s\0A\00"
define i32 @main(i32 %0, i8** nocapture readnone %1) {
%3 = alloca [1000 x i8]
%4 = alloca [1000 x i8]
%5 = getelementptr inbounds [1000 x i8], [1000 x i8]* %3, i64 0, i64 0
%6 = getelementptr inbounds [1000 x i8], [1000 x i8]* %4, i64 0, i64 0
%7 = call i32 @_getline(i8* %5)
%8 = icmp sgt i32 %7, 0
br i1 %8, label %9, label %23
9: ; preds = %2, %15
%10 = phi i32 [ %17, %15 ], [ %7, %2 ]
%11 = phi i32 [ %16, %15 ], [ 0, %2 ]
%12 = icmp sgt i32 %10, %11
br i1 %12, label %13, label %15
13: ; preds = %9
%14 = call i32 @_copy(i8* %5, i8* %6)
br label %15
15: ; preds = %13, %9
%16 = phi i32 [ %10, %13 ], [ %11, %9 ]
%17 = call i32 @_getline(i8* %5)
%18 = icmp sgt i32 %17, 0
br i1 %18, label %9, label %19
19: ; preds = %15
%20 = icmp sgt i32 %16, 0
br i1 %20, label %21, label %23
21: ; preds = %19
%22 = call i32 @printf(i8* getelementptr inbounds ([38 x i8], [38 x i8]* @.str, i64 0, i64 0), i32 %16, i8* %6)
br label %23
23: ; preds = %2, %21, %19
ret i32 0
}