#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 */
void *malloc(int);
double **createmat(int size) {
  int i;
  double **mat;
  mat = malloc(size * sizeof(double *));
  for (i = 0; i < size; i++) {
    mat[i] = malloc(size * sizeof(double));
  }
  return mat;
}


x86 assembly (clang, -O0):
<createmat>:
push   %rbp
mov    %rsp,%rbp
sub    $0x10,%rsp
mov    %edi,-0x4(%rbp)
movslq -0x4(%rbp),%rax
shl    $0x3,%rax
mov    %eax,%edi
call   1030 <malloc@plt>
mov    %rax,-0x10(%rbp)
movl   $0x0,-0x8(%rbp)
mov    -0x8(%rbp),%eax
cmp    -0x4(%rbp),%eax
jge    116d <createmat+0x5d>
movslq -0x4(%rbp),%rax
shl    $0x3,%rax
mov    %eax,%edi
call   1030 <malloc@plt>
mov    %rax,%rdx
mov    -0x10(%rbp),%rax
movslq -0x8(%rbp),%rcx
mov    %rdx,(%rax,%rcx,8)
mov    -0x8(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x8(%rbp)
jmp    1135 <createmat+0x25>
mov    -0x10(%rbp),%rax
add    $0x10,%rsp
pop    %rbp
ret

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

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

LLVM IR (-O2):
define noalias double** @createmat(i32 %0) {
%2 = shl i32 %0, 3
%3 = tail call i8* @malloc(i32 %2)
%4 = bitcast i8* %3 to double**
%5 = icmp sgt i32 %0, 0
br i1 %5, label %6, label %15
6: ; preds = %1
%7 = zext i32 %0 to i64
br label %8
8: ; preds = %6, %8
%9 = phi i64 [ 0, %6 ], [ %13, %8 ]
%10 = tail call i8* @malloc(i32 %2)
%11 = getelementptr inbounds double*, double** %4, i64 %9
%12 = bitcast double** %11 to i8**
store i8* %10, 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, %1
ret double** %4
}