#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 atoi(char *);
int /*<<< orphan*/ exit(int);
int /*<<< orphan*/ fprintf(int /*<<< orphan*/, char *, char *);
int /*<<< orphan*/ printf(char *, int);
int /*<<< orphan*/ stderr;
int main(int argc, char **argv) {
  int up_to;
  int i;
  if (argc != 2) {
    fprintf(stderr, "Usage: %s up_to\n", argv[0]);
    exit(1);
  }
  up_to = atoi(argv[1]);
  for (i = 0; i < up_to; i++)
    printf("%d\n", i + 1);
  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     1186 <main+0x46>
mov    0x2e79(%rip),%rax
mov    (%rax),%edi
mov    -0x10(%rbp),%rax
mov    (%rax),%rdx
lea    0xe89(%rip),%rsi
call   1040 <fprintf@plt>
mov    $0x1,%edi
call   1060 <exit@plt>
mov    -0x10(%rbp),%rax
mov    0x8(%rax),%rdi
call   1050 <atoi@plt>
mov    %eax,-0x14(%rbp)
movl   $0x0,-0x18(%rbp)
mov    -0x18(%rbp),%eax
cmp    -0x14(%rbp),%eax
jge    11c9 <main+0x89>
mov    -0x18(%rbp),%esi
add    $0x1,%esi
lea    0xe5b(%rip),%rdi
call   1030 <printf@plt>
mov    -0x18(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x18(%rbp)
jmp    119d <main+0x5d>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r15
push   %r14
push   %rbx
cmp    $0x2,%edi
jne    1195 <main+0x55>
mov    0x8(%rsi),%rdi
call   1050 <atoi@plt>
test   %eax,%eax
jle    118d <main+0x4d>
mov    %eax,%r15d
neg    %r15d
mov    $0x1,%ebx
lea    0xea8(%rip),%r14
nopl   0x0(%rax)
mov    %r14,%rdi
mov    %ebx,%esi
call   1030 <printf@plt>
lea    (%r15,%rbx,1),%eax
add    $0x1,%eax
mov    %ebx,%ecx
add    $0x1,%ecx
mov    %ecx,%ebx
cmp    $0x1,%eax
jne    1170 <main+0x30>
xor    %eax,%eax
pop    %rbx
pop    %r14
pop    %r15
ret
mov    0x2e44(%rip),%rax
mov    (%rax),%edi
mov    (%rsi),%rdx
lea    0xe58(%rip),%rsi
call   1040 <fprintf@plt>
mov    $0x1,%edi
call   1060 <exit@plt>

LLVM IR (-O0):
@stderr = global i32 0
@.str = [17 x i8] c"Usage: %s up_to\0A\00"
@.str.1 = [4 x i8] c"%d\0A\00"
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 ([17 x i8], [17 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* %6
store i32 0, i32* %7
br label %22
22: ; preds = %30, %17
%23 = load i32, i32* %7
%24 = load i32, i32* %6
%25 = icmp slt i32 %23, %24
br i1 %25, label %26, label %33
26: ; preds = %22
%27 = load i32, i32* %7
%28 = add nsw i32 %27, 1
%29 = call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i32 %28)
br label %30
30: ; preds = %26
%31 = load i32, i32* %7
%32 = add nsw i32 %31, 1
store i32 %32, i32* %7
br label %22
33: ; preds = %22
ret i32 0
}

LLVM IR (-O2):
@stderr = global i32 0
@.str = [17 x i8] c"Usage: %s up_to\0A\00"
@.str.1 = [4 x i8] c"%d\0A\00"
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 ([17 x i8], [17 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 = icmp sgt i32 %12, 0
br i1 %13, label %14, label %19
14: ; preds = %9, %14
%15 = phi i32 [ %16, %14 ], [ 0, %9 ]
%16 = add nuw nsw i32 %15, 1
%17 = tail call i32 @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.1, i64 0, i64 0), i32 %16)
%18 = icmp eq i32 %16, %12
br i1 %18, label %19, label %14
19: ; preds = %14, %9
ret i32 0
}