#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*/ FILE;

/* Variables and functions */
int /*<<< orphan*/ fclose(int /*<<< orphan*/ *);
int /*<<< orphan*/ *fgets(char *, int, int /*<<< orphan*/ *);
int /*<<< orphan*/ *fopen(char *, char *);
int /*<<< orphan*/ printf(char *, char *);
int main() {
  FILE *f;
  char s[1000];
  f = fopen("infile", "r");
  if (!f)
    return 1;
  while (fgets(s, 1000, f) != NULL)
    printf("%s", s);
  fclose(f);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x400,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xea7(%rip),%rdi
lea    0xea7(%rip),%rsi
call   1060 <fopen@plt>
mov    %rax,-0x10(%rbp)
cmpq   $0x0,-0x10(%rbp)
jne    1180 <main+0x40>
movl   $0x1,-0x4(%rbp)
jmp    11cc <main+0x8c>
jmp    1185 <main+0x45>
lea    -0x400(%rbp),%rdi
mov    -0x10(%rbp),%rdx
mov    $0x3e8,%esi
call   1050 <fgets@plt>
cmp    $0x0,%rax
je     11bc <main+0x7c>
lea    -0x400(%rbp),%rsi
lea    0xe57(%rip),%rdi
call   1040 <printf@plt>
jmp    1185 <main+0x45>
mov    -0x10(%rbp),%rdi
call   1030 <fclose@plt>
movl   $0x0,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x400,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r15
push   %r14
push   %rbx
sub    $0x3f0,%rsp
lea    0xead(%rip),%rdi
lea    0xead(%rip),%rsi
call   1060 <fopen@plt>
test   %rax,%rax
je     11bc <main+0x7c>
mov    %rax,%r15
mov    %rsp,%rdi
mov    $0x3e8,%esi
mov    %rax,%rdx
call   1050 <fgets@plt>
test   %rax,%rax
je     11b0 <main+0x70>
lea    0xe86(%rip),%r14
mov    %rsp,%rbx
cs nopw 0x0(%rax,%rax,1)
mov    %r14,%rdi
mov    %rbx,%rsi
call   1040 <printf@plt>
mov    %rbx,%rdi
mov    $0x3e8,%esi
mov    %r15,%rdx
call   1050 <fgets@plt>
test   %rax,%rax
jne    1190 <main+0x50>
mov    %r15,%rdi
call   1030 <fclose@plt>
xor    %eax,%eax
jmp    11c1 <main+0x81>
mov    $0x1,%eax
add    $0x3f0,%rsp
pop    %rbx
pop    %r14
pop    %r15
ret

LLVM IR (-O0):
@.str = [7 x i8] c"infile\00"
@.str.1 = [2 x i8] c"r\00"
@.str.2 = [3 x i8] c"%s\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32*
%3 = alloca [1000 x i8]
store i32 0, i32* %1
%4 = call i32* @fopen(i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
store i32* %4, i32** %2
%5 = load i32*, i32** %2
%6 = icmp ne i32* %5, null
br i1 %6, label %8, label %7
7: ; preds = %0
store i32 1, i32* %1
br label %20
8: ; preds = %0
br label %9
9: ; preds = %14, %8
%10 = getelementptr inbounds [1000 x i8], [1000 x i8]* %3, i64 0, i64 0
%11 = load i32*, i32** %2
%12 = call i32* @fgets(i8* %10, i32 1000, i32* %11)
%13 = icmp ne i32* %12, null
br i1 %13, label %14, label %17
14: ; preds = %9
%15 = getelementptr inbounds [1000 x i8], [1000 x i8]* %3, i64 0, i64 0
%16 = call i32 @printf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.2, i64 0, i64 0), i8* %15)
br label %9
17: ; preds = %9
%18 = load i32*, i32** %2
%19 = call i32 @fclose(i32* %18)
store i32 0, i32* %1
br label %20
20: ; preds = %17, %7
%21 = load i32, i32* %1
ret i32 %21
}

LLVM IR (-O2):
@.str = [7 x i8] c"infile\00"
@.str.1 = [2 x i8] c"r\00"
@.str.2 = [3 x i8] c"%s\00"
define i32 @main() {
%1 = alloca [1000 x i8]
%2 = getelementptr inbounds [1000 x i8], [1000 x i8]* %1, i64 0, i64 0
%3 = tail call i32* @fopen(i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0))
%4 = icmp eq i32* %3, null
br i1 %4, label %14, label %5
5: ; preds = %0
%6 = call i32* @fgets(i8* %2, i32 1000, i32* %3)
%7 = icmp eq i32* %6, null
br i1 %7, label %12, label %8
8: ; preds = %5, %8
%9 = call i32 @printf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.2, i64 0, i64 0), i8* %2)
%10 = call i32* @fgets(i8* %2, i32 1000, i32* %3)
%11 = icmp eq i32* %10, null
br i1 %11, label %12, label %8
12: ; preds = %8, %5
%13 = call i32 @fclose(i32* %3)
br label %14
14: ; preds = %0, %12
%15 = phi i32 [ 0, %12 ], [ 1, %0 ]
ret i32 %15
}