#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 atoi(char *);
int /*<<< orphan*/ exit(int);
int /*<<< orphan*/ fprintf(int /*<<< orphan*/, char *, char *);
int getchar();
int /*<<< orphan*/ putchar(int);
int /*<<< orphan*/ stderr;
int main(int argc, char **argv) {
  int c;
  int c_to_skip;
  if (argc != 2) {
    fprintf(stderr, "Usage: %s ascii_to_trim\n", argv[0]);
    exit(1);
  } else
    c_to_skip = atoi(argv[1]);
  while ((c = getchar()) != EOF) {
    if (c != c_to_skip)
      putchar(c);
  }
  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)
je     1196 <main+0x46>
mov    0x2e61(%rip),%rax
mov    (%rax),%edi
mov    -0x10(%rbp),%rax
mov    (%rax),%rdx
lea    0xe79(%rip),%rsi
call   1050 <fprintf@plt>
mov    $0x1,%edi
call   1070 <exit@plt>
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rdi
call   1060 <atoi@plt>
mov    %eax,-0x18(%rbp)
jmp    11ab <main+0x5b>
mov    $0x0,%al
call   1040 <getchar@plt>
mov    %eax,-0x14(%rbp)
mov    0x2e2c(%rip),%rcx
cmp    (%rcx),%eax
je     11dd <main+0x8d>
mov    -0x14(%rbp),%eax
cmp    -0x18(%rbp),%eax
je     11d8 <main+0x88>
mov    -0x14(%rbp),%edi
call   1030 <putchar@plt>
jmp    11ab <main+0x5b>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r14
push   %rbx
push   %rax
cmp    $0x2,%edi
jne    11a3 <main+0x53>
mov    0x8(%rsi),%rdi
call   1060 <atoi@plt>
mov    %eax,%ebx
xor    %eax,%eax
call   1040 <getchar@plt>
mov    0x2e76(%rip),%r14
jmp    1187 <main+0x37>
cs nopw 0x0(%rax,%rax,1)
xchg   %ax,%ax
xor    %eax,%eax
call   1040 <getchar@plt>
cmp    (%r14),%eax
je     1199 <main+0x49>
cmp    %ebx,%eax
je     1180 <main+0x30>
mov    %eax,%edi
call   1030 <putchar@plt>
jmp    1180 <main+0x30>
xor    %eax,%eax
add    $0x8,%rsp
pop    %rbx
pop    %r14
ret
mov    0x2e2e(%rip),%rax
mov    (%rax),%edi
mov    (%rsi),%rdx
lea    0xe4a(%rip),%rsi
call   1050 <fprintf@plt>
mov    $0x1,%edi
call   1070 <exit@plt>

LLVM IR (-O0):
@stderr = global i32 0
@.str = [25 x i8] c"Usage: %s ascii_to_trim\0A\00"
@EOF = global i32 0
define i32 @main(i32 %0, i8** %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i8**
%6 = alloca i32
%7 = alloca i32
store i32 0, i32* %3
store i32 %0, i32* %4
store i8** %1, i8*** %5
%8 = load i32, i32* %4
%9 = icmp ne i32 %8, 2
br i1 %9, label %10, label %17
10: ; preds = %2
%11 = load i32, i32* @stderr
%12 = load i8**, i8*** %5
%13 = getelementptr inbounds i8*, i8** %12, i64 0
%14 = load i8*, i8** %13
%15 = call i32 @fprintf(i32 %11, i8* getelementptr inbounds ([25 x i8], [25 x i8]* @.str, i64 0, i64 0), i8* %14)
%16 = call i32 @exit(i32 1)
unreachable
17: ; preds = %2
%18 = load i8**, i8*** %5
%19 = getelementptr inbounds i8*, i8** %18, i64 1
%20 = load i8*, i8** %19
%21 = call i32 @atoi(i8* %20)
store i32 %21, i32* %7
br label %22
22: ; preds = %17
br label %23
23: ; preds = %34, %22
%24 = call i32 (...) @getchar()
store i32 %24, i32* %6
%25 = load i32, i32* @EOF
%26 = icmp ne i32 %24, %25
br i1 %26, label %27, label %35
27: ; preds = %23
%28 = load i32, i32* %6
%29 = load i32, i32* %7
%30 = icmp ne i32 %28, %29
br i1 %30, label %31, label %34
31: ; preds = %27
%32 = load i32, i32* %6
%33 = call i32 @putchar(i32 %32)
br label %34
34: ; preds = %31, %27
br label %23
35: ; preds = %23
ret i32 0
}

LLVM IR (-O2):
@stderr = global i32 0
@.str = [25 x i8] c"Usage: %s ascii_to_trim\0A\00"
@EOF = global i32 0
define i32 @main(i32 %0, i8** nocapture %1) {
%3 = icmp eq i32 %0, 2
br i1 %3, label %9, label %4
4: ; preds = %2
%5 = load i32, i32* @stderr
%6 = load i8*, i8** %1
%7 = tail call i32 @fprintf(i32 %5, i8* getelementptr inbounds ([25 x i8], [25 x i8]* @.str, i64 0, i64 0), i8* %6)
%8 = tail call i32 @exit(i32 1)
unreachable
9: ; preds = %2
%10 = getelementptr inbounds i8*, i8** %1, i64 1
%11 = load i8*, i8** %10
%12 = tail call i32 @atoi(i8* %11)
%13 = tail call i32 (...) @getchar()
%14 = load i32, i32* @EOF
%15 = icmp eq i32 %13, %14
br i1 %15, label %25, label %16
16: ; preds = %9, %21
%17 = phi i32 [ %22, %21 ], [ %13, %9 ]
%18 = icmp eq i32 %17, %12
br i1 %18, label %21, label %19
19: ; preds = %16
%20 = tail call i32 @putchar(i32 %17)
br label %21
21: ; preds = %19, %16
%22 = tail call i32 (...) @getchar()
%23 = load i32, i32* @EOF
%24 = icmp eq i32 %22, %23
br i1 %24, label %25, label %16
25: ; preds = %21, %9
ret i32 0
}