#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*/ printf(char *, ...);
int /*<<< orphan*/ scanf(char *, int *);
int main() {
  int i, j, num;
  printf("enter the size of pattern: ");
  scanf("%d", &num);
  for (i = 0; i < num; i++) {
    for (j = 0; j < num - i; j++) {
      printf("%d ", j + 1);
    }
    printf("\n");
  }
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xeca(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xed8(%rip),%rdi
lea    -0x10(%rbp),%rsi
call   1040 <scanf@plt>
movl   $0x0,-0x8(%rbp)
mov    -0x8(%rbp),%eax
cmp    -0x10(%rbp),%eax
jge    11b6 <main+0x96>
movl   $0x0,-0xc(%rbp)
mov    -0xc(%rbp),%eax
mov    -0x10(%rbp),%ecx
sub    -0x8(%rbp),%ecx
cmp    %ecx,%eax
jge    119a <main+0x7a>
mov    -0xc(%rbp),%esi
add    $0x1,%esi
lea    0xe9a(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0xc(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0xc(%rbp)
jmp    1167 <main+0x47>
lea    0xe82(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x8(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x8(%rbp)
jmp    1154 <main+0x34>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbp
push   %r14
push   %rbx
sub    $0x10,%rsp
lea    0xec1(%rip),%rdi
xor    %eax,%eax
call   1040 <printf@plt>
lea    0xecf(%rip),%rdi
lea    0xc(%rsp),%rsi
call   1050 <scanf@plt>
mov    0xc(%rsp),%eax
test   %eax,%eax
jle    11ab <main+0x7b>
lea    0xeb9(%rip),%r14
xor    %ebx,%ebx
jmp    1185 <main+0x55>
nopw   0x0(%rax,%rax,1)
mov    $0xa,%edi
call   1030 <putchar@plt>
add    $0x1,%ebx
mov    0xc(%rsp),%eax
cmp    %eax,%ebx
jge    11ab <main+0x7b>
cmp    %ebx,%eax
jle    1170 <main+0x40>
xor    %ebp,%ebp
nopl   0x0(%rax,%rax,1)
add    $0x1,%ebp
mov    %r14,%rdi
mov    %ebp,%esi
xor    %eax,%eax
call   1040 <printf@plt>
mov    0xc(%rsp),%eax
sub    %ebx,%eax
cmp    %eax,%ebp
jl     1190 <main+0x60>
jmp    1170 <main+0x40>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbx
pop    %r14
pop    %rbp
ret

LLVM IR (-O0):
@.str = [28 x i8] c"enter the size of pattern: \00"
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [4 x i8] c"%d \00"
@.str.3 = [2 x i8] c"\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = alloca i32
%4 = alloca i32
store i32 0, i32* %1
%5 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([28 x i8], [28 x i8]* @.str, i64 0, i64 0))
%6 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %4)
store i32 0, i32* %2
br label %7
7: ; preds = %27, %0
%8 = load i32, i32* %2
%9 = load i32, i32* %4
%10 = icmp slt i32 %8, %9
br i1 %10, label %11, label %30
11: ; preds = %7
store i32 0, i32* %3
br label %12
12: ; preds = %22, %11
%13 = load i32, i32* %3
%14 = load i32, i32* %4
%15 = load i32, i32* %2
%16 = sub nsw i32 %14, %15
%17 = icmp slt i32 %13, %16
br i1 %17, label %18, label %25
18: ; preds = %12
%19 = load i32, i32* %3
%20 = add nsw i32 %19, 1
%21 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.2, i64 0, i64 0), i32 %20)
br label %22
22: ; preds = %18
%23 = load i32, i32* %3
%24 = add nsw i32 %23, 1
store i32 %24, i32* %3
br label %12
25: ; preds = %12
%26 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.3, i64 0, i64 0))
br label %27
27: ; preds = %25
%28 = load i32, i32* %2
%29 = add nsw i32 %28, 1
store i32 %29, i32* %2
br label %7
30: ; preds = %7
ret i32 0
}

LLVM IR (-O2):
@.str = [28 x i8] c"enter the size of pattern: \00"
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [4 x i8] c"%d \00"
define i32 @main() {
%1 = alloca i32
%2 = bitcast i32* %1 to i8*
%3 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([28 x i8], [28 x i8]* @.str, i64 0, i64 0))
%4 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %1)
%5 = load i32, i32* %1
%6 = icmp sgt i32 %5, 0
br i1 %6, label %7, label %23
7: ; preds = %0, %18
%8 = phi i32 [ %21, %18 ], [ %5, %0 ]
%9 = phi i32 [ %20, %18 ], [ 0, %0 ]
%10 = icmp sgt i32 %8, %9
br i1 %10, label %11, label %18
11: ; preds = %7, %11
%12 = phi i32 [ %13, %11 ], [ 0, %7 ]
%13 = add nuw nsw i32 %12, 1
%14 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str.2, i64 0, i64 0), i32 %13)
%15 = load i32, i32* %1
%16 = sub nsw i32 %15, %9
%17 = icmp slt i32 %13, %16
br i1 %17, label %11, label %18
18: ; preds = %11, %7
%19 = call i32 @putchar(i32 10)
%20 = add nuw nsw i32 %9, 1
%21 = load i32, i32* %1
%22 = icmp slt i32 %20, %21
br i1 %22, label %7, label %23
23: ; preds = %18, %0
ret i32 0
}