#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*/ *fopen(char *, char *);
int /*<<< orphan*/ fprintf(int /*<<< orphan*/, char *, char *);
int /*<<< orphan*/ stderr;
int fexists(char *fname) {
  FILE *file;
  if ((file = fopen(fname, "r")) == NULL) {
    fprintf(stderr, "file %s could not be opened\n", fname);
  } else {
    fclose(file);
    return 1;
  }
  return 0;
}


x86 assembly (clang, -O0):
<fexists>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %rdi,-0x10(%rbp)
mov    -0x10(%rbp),%rdi
lea    0xeb9(%rip),%rsi
call   1050 <fopen@plt>
mov    %rax,-0x18(%rbp)
cmp    $0x0,%rax
jne    1178 <fexists+0x48>
mov    0x2e7f(%rip),%rax
mov    (%rax),%edi
mov    -0x10(%rbp),%rdx
lea    0xe94(%rip),%rsi
call   1040 <fprintf@plt>
jmp    118d <fexists+0x5d>
mov    -0x18(%rbp),%rdi
call   1030 <fclose@plt>
movl   $0x1,-0x4(%rbp)
jmp    1194 <fexists+0x64>
movl   $0x0,-0x4(%rbp)
mov    -0x4(%rbp),%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<fexists>:
push   %rbx
mov    %rdi,%rbx
lea    0xec5(%rip),%rsi
call   1050 <fopen@plt>
test   %rax,%rax
je     1154 <fexists+0x24>
mov    %rax,%rdi
call   1030 <fclose@plt>
mov    $0x1,%eax
pop    %rbx
ret
mov    0x2e85(%rip),%rax
mov    (%rax),%edi
lea    0xe9e(%rip),%rsi
mov    %rbx,%rdx
call   1040 <fprintf@plt>
xor    %eax,%eax
pop    %rbx
ret

LLVM IR (-O0):
@.str = [2 x i8] c"r\00"
@stderr = global i32 0
@.str.1 = [29 x i8] c"file %s could not be opened\0A\00"
define i32 @fexists(i8* %0) {
%2 = alloca i32
%3 = alloca i8*
%4 = alloca i32*
store i8* %0, i8** %3
%5 = load i8*, i8** %3
%6 = call i32* @fopen(i8* %5, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i64 0, i64 0))
store i32* %6, i32** %4
%7 = icmp eq i32* %6, null
br i1 %7, label %8, label %12
8: ; preds = %1
%9 = load i32, i32* @stderr
%10 = load i8*, i8** %3
%11 = call i32 @fprintf(i32 %9, i8* getelementptr inbounds ([29 x i8], [29 x i8]* @.str.1, i64 0, i64 0), i8* %10)
br label %15
12: ; preds = %1
%13 = load i32*, i32** %4
%14 = call i32 @fclose(i32* %13)
store i32 1, i32* %2
br label %16
15: ; preds = %8
store i32 0, i32* %2
br label %16
16: ; preds = %15, %12
%17 = load i32, i32* %2
ret i32 %17
}

LLVM IR (-O2):
@.str = [2 x i8] c"r\00"
@stderr = global i32 0
@.str.1 = [29 x i8] c"file %s could not be opened\0A\00"
define i32 @fexists(i8* %0) {
%2 = tail call i32* @fopen(i8* %0, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i64 0, i64 0))
%3 = icmp eq i32* %2, null
br i1 %3, label %4, label %7
4: ; preds = %1
%5 = load i32, i32* @stderr
%6 = tail call i32 @fprintf(i32 %5, i8* getelementptr inbounds ([29 x i8], [29 x i8]* @.str.1, i64 0, i64 0), i8* %0)
br label %9
7: ; preds = %1
%8 = tail call i32 @fclose(i32* %2)
br label %9
9: ; preds = %4, %7
%10 = phi i32 [ 0, %4 ], [ 1, %7 ]
ret i32 %10
}