• timvol (16/16) Sep 27 2017 Hi guys,
• =?UTF-8?Q?Ali_=c3=87ehreli?= (7/23) Sep 27 2017 void main() {
• timvol (3/12) Sep 27 2017 Works perfect. Thank you!
• Igor (4/18) Sep 29 2017 I know you can also use this with static arrays:

timvol <timvol unknownmailaddress.com> writes:

Hi guys,
how can I allocate an (e.g. 16) byte aligned array?
In C I can do the following:

     void *mem = malloc(1024+15);
     void *ptr = ((uintptr_t)mem+15) & ~ (uintptr_t)0x0F;
     memset_16aligned(ptr, 0, 1024);
     free(mem);

I think in D it looks similar to this:

     auto mem = new ubyte[1024+15];
     auto ptr = (mem.ptr + 15) & ~ (...???...) 0x0F;

How to fill ...???... ?
Without a cast, the compiler tells me that I the types are 
incompatible (ubyte* and int).

What's the correct syntax here?

PS: I don't want to use the experimental branch that provides 
alignedAllocate().

=?UTF-8?Q?Ali_=c3=87ehreli?= <acehreli yahoo.com> writes:

On 09/27/2017 02:39 PM, timvol wrote:
 Hi guys,
 how can I allocate an (e.g. 16) byte aligned array?
 In C I can do the following:

     void *mem = malloc(1024+15);
     void *ptr = ((uintptr_t)mem+15) & ~ (uintptr_t)0x0F;
     memset_16aligned(ptr, 0, 1024);
     free(mem);

 I think in D it looks similar to this:

     auto mem = new ubyte[1024+15];
     auto ptr = (mem.ptr + 15) & ~ (...???...) 0x0F;

 How to fill ...???... ?
 Without a cast, the compiler tells me that I the types are incompatible
 (ubyte* and int).

 What's the correct syntax here?

 PS: I don't want to use the experimental branch that provides
 alignedAllocate().

void main() {
     auto mem = new ubyte[1024+15];
     auto ptr = cast(ubyte*)(cast(ulong)(mem.ptr + 15) & ~0x0FUL);
     auto arr = ptr[0..1024];
}

Ali

timvol <timvol unknownmailaddress.com> writes:

On Wednesday, 27 September 2017 at 21:44:48 UTC, Ali Çehreli 
wrote:
 On 09/27/2017 02:39 PM, timvol wrote:
 [...]

 void main() {
     auto mem = new ubyte[1024+15];
     auto ptr = cast(ubyte*)(cast(ulong)(mem.ptr + 15) & 
 ~0x0FUL);
     auto arr = ptr[0..1024];
 }

 Ali

Works perfect. Thank you!

Igor <stojkovic.igor gmail.com> writes:

On Wednesday, 27 September 2017 at 21:48:35 UTC, timvol wrote:
 On Wednesday, 27 September 2017 at 21:44:48 UTC, Ali Çehreli 
 wrote:
 On 09/27/2017 02:39 PM, timvol wrote:
 [...]

 void main() {
     auto mem = new ubyte[1024+15];
     auto ptr = cast(ubyte*)(cast(ulong)(mem.ptr + 15) & 
 ~0x0FUL);
     auto arr = ptr[0..1024];
 }

 Ali

 Works perfect. Thank you!

I know you can also use this with static arrays:

align(16) ubyte[1024] mem;

But I guess align directive doesn't work with dynamic arrays...