#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 *calloc(int, int);
int **malloc(int);
int **make_2d_array(int cols, int rows) {
  int y;
  int **arr;
  arr = malloc(sizeof(int *) * rows);
  for (y = 0; y < rows; ++y) {
    arr[y] = calloc(sizeof(int), cols);
  }
  return arr;
}


x86 assembly (clang, -O0):
<make_2d_array>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %edi,-0x4(%rbp)
mov    %esi,-0x8(%rbp)
movslq -0x8(%rbp),%rax
shl    $0x3,%rax
mov    %eax,%edi
call   1040 <malloc@plt>
mov    %rax,-0x18(%rbp)
movl   $0x0,-0xc(%rbp)
mov    -0xc(%rbp),%eax
cmp    -0x8(%rbp),%eax
jge    117e <make_2d_array+0x5e>
mov    -0x4(%rbp),%esi
mov    $0x4,%edi
call   1030 <calloc@plt>
mov    %rax,%rdx
mov    -0x18(%rbp),%rax
movslq -0xc(%rbp),%rcx
mov    %rdx,(%rax,%rcx,8)
mov    -0xc(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0xc(%rbp)
jmp    1148 <make_2d_array+0x28>
mov    -0x18(%rbp),%rax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<make_2d_array>:
push   %rbp
push   %r15
push   %r14
push   %r12
push   %rbx
mov    %esi,%r14d
mov    %edi,%r15d
lea    0x0(,%r14,8),%edi
call   1040 <malloc@plt>
mov    %rax,%r12
test   %r14d,%r14d
jle    116a <make_2d_array+0x4a>
mov    %r14d,%ebp
xor    %ebx,%ebx
nopl   0x0(%rax,%rax,1)
mov    $0x4,%edi
mov    %r15d,%esi
call   1030 <calloc@plt>
mov    %rax,(%r12,%rbx,8)
add    $0x1,%rbx
cmp    %rbx,%rbp
jne    1150 <make_2d_array+0x30>
mov    %r12,%rax
pop    %rbx
pop    %r12
pop    %r14
pop    %r15
pop    %rbp
ret

LLVM IR (-O0):
define i32** @make_2d_array(i32 %0, i32 %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i32
%6 = alloca i32**
store i32 %0, i32* %3
store i32 %1, i32* %4
%7 = load i32, i32* %4
%8 = sext i32 %7 to i64
%9 = mul i64 8, %8
%10 = trunc i64 %9 to i32
%11 = call i32** @malloc(i32 %10)
store i32** %11, i32*** %6
store i32 0, i32* %5
br label %12
12: ; preds = %23, %2
%13 = load i32, i32* %5
%14 = load i32, i32* %4
%15 = icmp slt i32 %13, %14
br i1 %15, label %16, label %26
16: ; preds = %12
%17 = load i32, i32* %3
%18 = call i32* @calloc(i32 4, i32 %17)
%19 = load i32**, i32*** %6
%20 = load i32, i32* %5
%21 = sext i32 %20 to i64
%22 = getelementptr inbounds i32*, i32** %19, i64 %21
store i32* %18, i32** %22
br label %23
23: ; preds = %16
%24 = load i32, i32* %5
%25 = add nsw i32 %24, 1
store i32 %25, i32* %5
br label %12
26: ; preds = %12
%27 = load i32**, i32*** %6
ret i32** %27
}

LLVM IR (-O2):
define noalias i32** @make_2d_array(i32 %0, i32 %1) {
%3 = shl i32 %1, 3
%4 = tail call i32** @malloc(i32 %3)
%5 = icmp sgt i32 %1, 0
br i1 %5, label %6, label %14
6: ; preds = %2
%7 = zext i32 %1 to i64
br label %8
8: ; preds = %6, %8
%9 = phi i64 [ 0, %6 ], [ %12, %8 ]
%10 = tail call i32* @calloc(i32 4, i32 %0)
%11 = getelementptr inbounds i32*, i32** %4, i64 %9
store i32* %10, i32** %11
%12 = add nuw nsw i64 %9, 1
%13 = icmp eq i64 %12, %7
br i1 %13, label %14, label %8
14: ; preds = %8, %2
ret i32** %4
}