#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*/ STDOUT_FILENO;
int isatty(int /*<<< orphan*/);
int /*<<< orphan*/ printf(char *, ...);
int main(int argc, const char *argv[]) {
  if (argc == 2) {
    printf("isatty(%s) returns %d\n", argv[1], isatty(STDOUT_FILENO));
  } else {
    printf("isatty() returns %d\n", isatty(STDOUT_FILENO));
  }
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
movl   $0x0,-0x4(%rbp)
mov    %edi,-0x8(%rbp)
mov    %rsi,-0x10(%rbp)
cmpl   $0x2,-0x8(%rbp)
jne    1173 <main+0x53>
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rax
mov    %rax,-0x18(%rbp)
mov    0x2e9d(%rip),%rax
mov    (%rax),%edi
call   1030 <isatty@plt>
mov    -0x18(%rbp),%rsi
mov    %eax,%edx
lea    0xe99(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
jmp    1191 <main+0x71>
mov    0x2e76(%rip),%rax
mov    (%rax),%edi
call   1030 <isatty@plt>
mov    %eax,%esi
lea    0xe8d(%rip),%rdi
mov    $0x0,%al
call   1040 <printf@plt>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
cmp    $0x2,%edi
jne    114d <main+0x2d>
mov    0x8(%rsi),%rbx
mov    0x2ebf(%rip),%rax
mov    (%rax),%edi
call   1030 <isatty@plt>
lea    0xec1(%rip),%rdi
mov    %rbx,%rsi
mov    %eax,%edx
xor    %eax,%eax
call   1040 <printf@plt>
jmp    116b <main+0x4b>
mov    0x2e9c(%rip),%rax
mov    (%rax),%edi
call   1030 <isatty@plt>
lea    0xeb5(%rip),%rdi
mov    %eax,%esi
xor    %eax,%eax
call   1040 <printf@plt>
xor    %eax,%eax
pop    %rbx
ret

LLVM IR (-O0):
@.str = [23 x i8] c"isatty(%s) returns %d\0A\00"
@STDOUT_FILENO = global i32 0
@.str.1 = [21 x i8] c"isatty() returns %d\0A\00"
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
%6 = load i32, i32* %4
%7 = icmp eq i32 %6, 2
br i1 %7, label %8, label %15
8: ; preds = %2
%9 = load i8**, i8*** %5
%10 = getelementptr inbounds i8*, i8** %9, i64 1
%11 = load i8*, i8** %10
%12 = load i32, i32* @STDOUT_FILENO
%13 = call i32 @isatty(i32 %12)
%14 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([23 x i8], [23 x i8]* @.str, i64 0, i64 0), i8* %11, i32 %13)
br label %19
15: ; preds = %2
%16 = load i32, i32* @STDOUT_FILENO
%17 = call i32 @isatty(i32 %16)
%18 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([21 x i8], [21 x i8]* @.str.1, i64 0, i64 0), i32 %17)
br label %19
19: ; preds = %15, %8
ret i32 0
}

LLVM IR (-O2):
@.str = [23 x i8] c"isatty(%s) returns %d\0A\00"
@STDOUT_FILENO = global i32 0
@.str.1 = [21 x i8] c"isatty() returns %d\0A\00"
define i32 @main(i32 %0, i8** nocapture %1) {
%3 = icmp eq i32 %0, 2
br i1 %3, label %4, label %10
4: ; preds = %2
%5 = getelementptr inbounds i8*, i8** %1, i64 1
%6 = load i8*, i8** %5
%7 = load i32, i32* @STDOUT_FILENO
%8 = tail call i32 @isatty(i32 %7)
%9 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([23 x i8], [23 x i8]* @.str, i64 0, i64 0), i8* %6, i32 %8)
br label %14
10: ; preds = %2
%11 = load i32, i32* @STDOUT_FILENO
%12 = tail call i32 @isatty(i32 %11)
%13 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([21 x i8], [21 x i8]* @.str.1, i64 0, i64 0), i32 %12)
br label %14
14: ; preds = %10, %4
ret i32 0
}