StructType.init and StructType() cause a allocation

[Benjamin Thaut]

Am 30.06.2012 13:52, schrieb bearophile:
>> I don't know if that bug fix (in dmd 2.060alpha) has fixed your
>> problem too.
>
> I have compiled this code from your issue 7271 with the latest beta:
>
>
> struct MemoryBlockInfo {
>      size_t size;
>      long[10] backtrace;
>      int backtraceSize;
>
>      this(size_t size) {
>          this.size = size;
>      }
> }
> void main() {
>      MemoryBlockInfo info;
>      info = MemoryBlockInfo.init; //array allocation here
> }
>
>
> Compiling it with no optimization it gives:
>
>
> _D4temp15MemoryBlockInfo6__ctorMFkZS4temp15MemoryBlockInfo
>          enter   4,0
>          mov ECX,8[EBP]
>          mov [EAX],ECX
>          leave
>          ret 4
>
> __Dmain comdat
>          enter   060h,0
>          push    ESI
>          push    EDI
>          mov ECX,018h
>          xor EAX,EAX
>          lea EDI,-060h[EBP]
>          rep
>          stosd
>          mov ESI,offset FLAT:_D4temp15MemoryBlockInfo6__initZ
>          lea EDI,-060h[EBP]
>          mov CL,018h
>          rep
>          movsd
>          pop EDI
>          pop ESI
>          leave
>          ret
>
>
> With -O -release -inline it becomes:
>
>
> _D4temp15MemoryBlockInfo6__ctorMFkZS4temp15MemoryBlockInfo  comdat
>          push    EAX
>          mov ECX,8[ESP]
>          mov [EAX],ECX
>          pop ECX
>          ret 4
>
> __Dmain comdat
>          sub ESP,064h
>          mov ECX,018h
>          xor EAX,EAX
>          push    EDI
>          lea EDI,4[ESP]
>          rep
>          stosd
>          pop EDI
>          add ESP,064h
>          ret
>
>
> In both cases I don't see a memory allocation.
>
> Bye,
> bearophile

Thank you, Its very nice to know that this got fixed. Someone might want 
to close the ticket as duplicate then.

Kind Regards
Benjamin Thaut