#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__ ckalloc(int);
char **CharMatrix(int M, int N) {
  int m;
  char **Matrix;
  Matrix = (char **)ckalloc(M * sizeof(char *));
  for (m = 0; m < M; m++)
    Matrix[m] = (char *)ckalloc(N * sizeof(char));
  return (Matrix);
}


x86 assembly (clang, -O0):
<CharMatrix>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
mov    %edi,-0x4(%rbp)
mov    %esi,-0x8(%rbp)
movslq -0x4(%rbp),%rax
shl    $0x3,%rax
mov    %eax,%edi
call   1030 <ckalloc@plt>
mov    %rax,-0x18(%rbp)
movl   $0x0,-0xc(%rbp)
mov    -0xc(%rbp),%eax
cmp    -0x4(%rbp),%eax
jge    1170 <CharMatrix+0x60>
movslq -0x8(%rbp),%rax
shl    $0x0,%rax
mov    %eax,%edi
call   1030 <ckalloc@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    1138 <CharMatrix+0x28>
mov    -0x18(%rbp),%rax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<CharMatrix>:
push   %rbp
push   %r15
push   %r14
push   %r12
push   %rbx
mov    %esi,%r15d
mov    %edi,%r14d
lea    0x0(,%r14,8),%edi
call   1030 <ckalloc@plt>
mov    %rax,%r12
test   %r14d,%r14d
jle    1155 <CharMatrix+0x45>
mov    %r14d,%ebp
xor    %ebx,%ebx
nopl   0x0(%rax,%rax,1)
mov    %r15d,%edi
call   1030 <ckalloc@plt>
mov    %rax,(%r12,%rbx,8)
add    $0x1,%rbx
cmp    %rbx,%rbp
jne    1140 <CharMatrix+0x30>
mov    %r12,%rax
pop    %rbx
pop    %r12
pop    %r14
pop    %r15
pop    %rbp
ret

LLVM IR (-O0):
define i8** @CharMatrix(i32 %0, i32 %1) {
%3 = alloca i32
%4 = alloca i32
%5 = alloca i32
%6 = alloca i8**
store i32 %0, i32* %3
store i32 %1, i32* %4
%7 = load i32, i32* %3
%8 = sext i32 %7 to i64
%9 = mul i64 %8, 8
%10 = trunc i64 %9 to i32
%11 = call i64 @ckalloc(i32 %10)
%12 = inttoptr i64 %11 to i8**
store i8** %12, i8*** %6
store i32 0, i32* %5
br label %13
13: ; preds = %28, %2
%14 = load i32, i32* %5
%15 = load i32, i32* %3
%16 = icmp slt i32 %14, %15
br i1 %16, label %17, label %31
17: ; preds = %13
%18 = load i32, i32* %4
%19 = sext i32 %18 to i64
%20 = mul i64 %19, 1
%21 = trunc i64 %20 to i32
%22 = call i64 @ckalloc(i32 %21)
%23 = inttoptr i64 %22 to i8*
%24 = load i8**, i8*** %6
%25 = load i32, i32* %5
%26 = sext i32 %25 to i64
%27 = getelementptr inbounds i8*, i8** %24, i64 %26
store i8* %23, i8** %27
br label %28
28: ; preds = %17
%29 = load i32, i32* %5
%30 = add nsw i32 %29, 1
store i32 %30, i32* %5
br label %13
31: ; preds = %13
%32 = load i8**, i8*** %6
ret i8** %32
}

LLVM IR (-O2):
define i8** @CharMatrix(i32 %0, i32 %1) {
%3 = shl i32 %0, 3
%4 = tail call i64 @ckalloc(i32 %3)
%5 = inttoptr i64 %4 to i8**
%6 = icmp sgt i32 %0, 0
br i1 %6, label %7, label %16
7: ; preds = %2
%8 = zext i32 %0 to i64
br label %9
9: ; preds = %7, %9
%10 = phi i64 [ 0, %7 ], [ %14, %9 ]
%11 = tail call i64 @ckalloc(i32 %1)
%12 = inttoptr i64 %11 to i8*
%13 = getelementptr inbounds i8*, i8** %5, i64 %10
store i8* %12, i8** %13
%14 = add nuw nsw i64 %10, 1
%15 = icmp eq i64 %14, %8
br i1 %15, label %16, label %9
16: ; preds = %9, %2
ret i8** %5
}