llvm dev - Jan 2012 - [LLVMdev] How to force the creation of arrays with zeroes?

Hi all. How to force the creation of arrays with zeroes? Or this use-case is not
provided?

-- 
Truly yours,
Stepan Dyatkovskiy

Stepan Dyatkovskiy wrote:
> Hi all. How to force the creation of arrays with zeroes? Or this use-case
is not provided?
That is impossible, LLVM will always canonicalize that to a 
ConstantAggregateZero.

Nick

Hi Stepan,
> Hi all. How to force the creation of arrays with zeroes? Or this use-case
is not provided?
you can't, you can only get a ConstantAggregateZero.  This is actually kind
of
annoying, and means that places expecting a ConstantArray have to remember to
also check for ConstantAggregateZero.  Perhaps there's a good reason for the
current design, but if not it would be great to eliminate this wart.

Ciao, Duncan.

> you can't, you can only get a ConstantAggregateZero.  This is actually
kind of
> annoying, and means that places expecting a ConstantArray have to remember
to
> also check for ConstantAggregateZero.  Perhaps there's a good reason
for the
> current design, but if not it would be great to eliminate this wart.
Well, I think the main reason it so reduce the size of .ll / .bc when
all operands are zero.
If the array / struct is really big then this can save a lot of space.

-- 
With best regards, Anton Korobeynikov
Faculty of Mathematics and Mechanics, Saint Petersburg State University