Basic shifting question

[Stefan Duenser]

Hello

A very easy problem for most of you I assume: Normally when I want to shift
left I do it the following way:

result((arraylength-2) downto 0) & '0';

So far so good, the problem is how can I write this statement when I want to
shift for example by 100 positions?

It wouldnt make sense to write result((arraylength-101) downto 0) &
"0000000.....000" 100 times a zero.
I tried it this way but it didnt work: result((arraylength-101) downto 0) &
(others=>'0');

Any other suggestions?

Thanks a lot

 

[Paul Uiterlinden]

Stefan Duenser wrote:

Hello

A very easy problem for most of you I assume: Normally when I want to shift
left I do it the following way:

result((arraylength-2) downto 0) & '0';

So far so good, the problem is how can I write this statement when I want to
shift for example by 100 positions?

It wouldnt make sense to write result((arraylength-101) downto 0) &
"0000000.....000" 100 times a zero.
I tried it this way but it didnt work: result((arraylength-101) downto 0) &
(others=>'0');

Any other suggestions?

Yep:

result((arraylength-101) downto 0) & (99 downto 0 => '0');

Paul.

 

[Mark]

You can also use the SHL and EXT functions to do the shifting and
padding for you.

 

[Mark]

You can also use the SHL and EXT functions to do the shifting and
padding for you.

 

[Stefan Duenser]

Yep:

result((arraylength-101) downto 0) & (99 downto 0 => '0');

Thanks a lot, for this I was looking

bye
SD