#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, rows;
  printf("Enter the number of rows: ");
  scanf("%d", &rows);
  for (i = rows; i >= 1; --i) {
    for (j = 1; j <= i; ++j) {
      printf("%d ", j);
    }
    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    0xed7(%rip),%rdi
lea    -0x10(%rbp),%rsi
call   1040 <scanf@plt>
mov    -0x10(%rbp),%eax
mov    %eax,-0x8(%rbp)
cmpl   $0x1,-0x8(%rbp)
jl     11ab <main+0x8b>
movl   $0x1,-0xc(%rbp)
mov    -0xc(%rbp),%eax
cmp    -0x8(%rbp),%eax
jg     118f <main+0x6f>
mov    -0xc(%rbp),%esi
lea    0xea4(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0xc(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0xc(%rbp)
jmp    1164 <main+0x44>
lea    0xe8c(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
mov    -0x8(%rbp),%eax
add    $0xffffffff,%eax
mov    %eax,-0x8(%rbp)
jmp    1153 <main+0x33>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r15
push   %r14
push   %r12
push   %rbx
push   %rax
lea    0xec1(%rip),%rdi
xor    %eax,%eax
call   1040 <printf@plt>
lea    0xece(%rip),%rdi
lea    0x4(%rsp),%rsi
call   1050 <scanf@plt>
mov    0x4(%rsp),%r15d
test   %r15d,%r15d
jle    11ba <main+0x8a>
mov    %r15d,%r12d
neg    %r12d
lea    0xeb0(%rip),%r14
xchg   %ax,%ax
mov    $0x1,%ebx
cs nopw 0x0(%rax,%rax,1)
nop
mov    %r14,%rdi
mov    %ebx,%esi
xor    %eax,%eax
call   1040 <printf@plt>
lea    (%r12,%rbx,1),%eax
add    $0x1,%eax
mov    %ebx,%ecx
add    $0x1,%ecx
mov    %ecx,%ebx
cmp    $0x1,%eax
jne    1180 <main+0x50>
mov    $0xa,%edi
call   1030 <putchar@plt>
lea    -0x1(%r15),%eax
add    $0x1,%r12d
cmp    $0x1,%r15d
mov    %eax,%r15d
jg     1170 <main+0x40>
xor    %eax,%eax
add    $0x8,%rsp
pop    %rbx
pop    %r12
pop    %r14
pop    %r15
ret

LLVM IR (-O0):
@.str = [27 x i8] c"Enter the number of rows: \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 ([27 x i8], [27 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)
%7 = load i32, i32* %4
store i32 %7, i32* %2
br label %8
8: ; preds = %24, %0
%9 = load i32, i32* %2
%10 = icmp sge i32 %9, 1
br i1 %10, label %11, label %27
11: ; preds = %8
store i32 1, i32* %3
br label %12
12: ; preds = %19, %11
%13 = load i32, i32* %3
%14 = load i32, i32* %2
%15 = icmp sle i32 %13, %14
br i1 %15, label %16, label %22
16: ; preds = %12
%17 = load i32, i32* %3
%18 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.2, i64 0, i64 0), i32 %17)
br label %19
19: ; preds = %16
%20 = load i32, i32* %3
%21 = add nsw i32 %20, 1
store i32 %21, i32* %3
br label %12
22: ; preds = %12
%23 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.3, i64 0, i64 0))
br label %24
24: ; preds = %22
%25 = load i32, i32* %2
%26 = add nsw i32 %25, -1
store i32 %26, i32* %2
br label %8
27: ; preds = %8
ret i32 0
}

LLVM IR (-O2):
@.str = [27 x i8] c"Enter the number of rows: \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 ([27 x i8], [27 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 %22
7: ; preds = %0
%8 = add nuw i32 %5, 1
br label %9
9: ; preds = %17, %7
%10 = phi i32 [ %8, %7 ], [ %21, %17 ]
%11 = phi i32 [ %5, %7 ], [ %19, %17 ]
br label %12
12: ; preds = %9, %12
%13 = phi i32 [ %15, %12 ], [ 1, %9 ]
%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 = add nuw i32 %13, 1
%16 = icmp eq i32 %15, %10
br i1 %16, label %17, label %12
17: ; preds = %12
%18 = call i32 @putchar(i32 10)
%19 = add nsw i32 %11, -1
%20 = icmp sgt i32 %11, 1
%21 = add i32 %10, -1
br i1 %20, label %9, label %22
22: ; preds = %17, %0
ret i32 0
}