#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 EOF;
int getchar();
int /*<<< orphan*/ printf(char *);
int /*<<< orphan*/ putchar(int);
int main(int argc, char **argv) {
  int ch;
  printf("Entering the stdin redirection test\n");
  while ((ch = getchar()) != EOF) {
    putchar(ch);
  }
  printf("Exit-ing the stdin redirection test\n");
  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)
lea    0xeb3(%rip),%rdi
call   1040 <printf@plt>
mov    $0x0,%al
call   1050 <getchar@plt>
mov    %eax,-0x14(%rbp)
mov    0x2e85(%rip),%rcx
cmp    (%rcx),%eax
je     1178 <main+0x48>
mov    -0x14(%rbp),%edi
call   1030 <putchar@plt>
jmp    1152 <main+0x22>
lea    0xea6(%rip),%rdi
call   1040 <printf@plt>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbx
lea    0xec8(%rip),%rdi
call   1040 <puts@plt>
xor    %eax,%eax
call   1050 <getchar@plt>
mov    0x2e9d(%rip),%rbx
cmp    (%rbx),%eax
je     1162 <main+0x32>
nop
mov    %eax,%edi
call   1030 <putchar@plt>
xor    %eax,%eax
call   1050 <getchar@plt>
cmp    (%rbx),%eax
jne    1150 <main+0x20>
lea    0xebb(%rip),%rdi
call   1040 <puts@plt>
xor    %eax,%eax
pop    %rbx
ret

LLVM IR (-O0):
@.str = [37 x i8] c"Entering the stdin redirection test\0A\00"
@EOF = global i32 0
@.str.1 = [37 x i8] c"Exit-ing the stdin redirection test\0A\00"
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
%6 = alloca i32
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
%7 = call i32 @printf(i8* getelementptr inbounds ([37 x i8], [37 x i8]* @.str, i64 0, i64 0))
br label %8
8: ; preds = %12, %2
%9 = call i32 (...) @getchar()
store i32 %9, i32* %6
%10 = load i32, i32* @EOF
%11 = icmp ne i32 %9, %10
br i1 %11, label %12, label %15
12: ; preds = %8
%13 = load i32, i32* %6
%14 = call i32 @putchar(i32 %13)
br label %8
15: ; preds = %8
%16 = call i32 @printf(i8* getelementptr inbounds ([37 x i8], [37 x i8]* @.str.1, i64 0, i64 0))
ret i32 0
}

LLVM IR (-O2):
@EOF = global i32 0
@str = [36 x i8] c"Entering the stdin redirection test\00"
@str.2 = [36 x i8] c"Exit-ing the stdin redirection test\00"
define i32 @main(i32 %0, i8** nocapture readnone %1) {
%3 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([36 x i8], [36 x i8]* @str, i64 0, i64 0))
%4 = tail call i32 (...) @getchar()
%5 = load i32, i32* @EOF
%6 = icmp eq i32 %4, %5
br i1 %6, label %13, label %7
7: ; preds = %2, %7
%8 = phi i32 [ %10, %7 ], [ %4, %2 ]
%9 = tail call i32 @putchar(i32 %8)
%10 = tail call i32 (...) @getchar()
%11 = load i32, i32* @EOF
%12 = icmp eq i32 %10, %11
br i1 %12, label %13, label %7
13: ; preds = %7, %2
%14 = tail call i32 @puts(i8* dereferenceable(1) getelementptr inbounds ([36 x i8], [36 x i8]* @str.2, i64 0, i64 0))
ret i32 0
}