#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 */
scalar_t__ calloc(int, int);
char **createEmptyMatrix(int w, int h) {
  int i, j;
  char **m = (char **)calloc(w, sizeof(char *));
  for (i = 0; i < w; i++) {
    m[i] = (char *)calloc(h, sizeof(char));
  }
  return m;
}


x86 assembly (clang, -O0):
<createEmptyMatrix>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %edi,-0x4(%rbp)
mov    %esi,-0x8(%rbp)
mov    -0x4(%rbp),%edi
mov    $0x8,%esi
call   1030 <calloc@plt>
mov    %rax,-0x18(%rbp)
movl   $0x0,-0xc(%rbp)
mov    -0xc(%rbp),%eax
cmp    -0x4(%rbp),%eax
jge    116c <createEmptyMatrix+0x5c>
mov    -0x8(%rbp),%edi
mov    $0x1,%esi
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    1136 <createEmptyMatrix+0x26>
mov    -0x18(%rbp),%rax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<createEmptyMatrix>:
push   %rbp
push   %r15
push   %r14
push   %r12
push   %rbx
mov    %esi,%r15d
mov    %edi,%r14d
mov    $0x8,%esi
call   1030 <calloc@plt>
mov    %rax,%r12
test   %r14d,%r14d
jle    115a <createEmptyMatrix+0x4a>
mov    %r14d,%ebp
xor    %ebx,%ebx
cs nopw 0x0(%rax,%rax,1)
nop
mov    %r15d,%edi
mov    $0x1,%esi
call   1030 <calloc@plt>
mov    %rax,(%r12,%rbx,8)
add    $0x1,%rbx
cmp    %rbx,%rbp
jne    1140 <createEmptyMatrix+0x30>
mov    %r12,%rax
pop    %rbx
pop    %r12
pop    %r14
pop    %r15
pop    %rbp
ret

LLVM IR (-O0):
define i8** @createEmptyMatrix(i32 %0, i32 %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i32
%6 = alloca i32
%7 = alloca i8**
store i32 %0, i32* %3
store i32 %1, i32* %4
%8 = load i32, i32* %3
%9 = call i64 @calloc(i32 %8, i32 8)
%10 = inttoptr i64 %9 to i8**
store i8** %10, i8*** %7
store i32 0, i32* %5
br label %11
11: ; preds = %23, %2
%12 = load i32, i32* %5
%13 = load i32, i32* %3
%14 = icmp slt i32 %12, %13
br i1 %14, label %15, label %26
15: ; preds = %11
%16 = load i32, i32* %4
%17 = call i64 @calloc(i32 %16, i32 1)
%18 = inttoptr i64 %17 to i8*
%19 = load i8**, i8*** %7
%20 = load i32, i32* %5
%21 = sext i32 %20 to i64
%22 = getelementptr inbounds i8*, i8** %19, i64 %21
store i8* %18, i8** %22
br label %23
23: ; preds = %15
%24 = load i32, i32* %5
%25 = add nsw i32 %24, 1
store i32 %25, i32* %5
br label %11
26: ; preds = %11
%27 = load i8**, i8*** %7
ret i8** %27
}

LLVM IR (-O2):
define i8** @createEmptyMatrix(i32 %0, i32 %1) {
%3 = tail call i64 @calloc(i32 %0, i32 8)
%4 = inttoptr i64 %3 to i8**
%5 = icmp sgt i32 %0, 0
br i1 %5, label %6, label %15
6: ; preds = %2
%7 = zext i32 %0 to i64
br label %8
8: ; preds = %6, %8
%9 = phi i64 [ 0, %6 ], [ %13, %8 ]
%10 = tail call i64 @calloc(i32 %1, i32 1)
%11 = inttoptr i64 %10 to i8*
%12 = getelementptr inbounds i8*, i8** %4, i64 %9
store i8* %11, i8** %12
%13 = add nuw nsw i64 %9, 1
%14 = icmp eq i64 %13, %7
br i1 %14, label %15, label %8
15: ; preds = %8, %2
ret i8** %4
}