Error: unimplemented function(s) used:

Error: unimplemented function(s) used:

Imagen de sharpneli
sharpneli
Mié, 16/03/2011 - 03:52

First of all I wish to say that Intel's alpha release of OpenCL 1.1 is currently among the best out there. However despite this it seems some features have slipped trough the cracks.

If vector indexing is used with select it simply does not work.
uchar3 xx,yy,zz;
select(min(zz.x, max(xx.z,yy.y)), zz.x, zz.x < min(xx.z,yy.y));

produces

Error: unimplemented function(s) used:
_Z6selecthhi in function foo

Obviously I use ?: notation for scalars now, but it's 'cleaner' to use select everywhere.

p.s I wonder if using an unimplemented function is a valid error according to the spec ;)

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Imagen de Shiri Manor (Intel)
Shiri Manor (Intel)
Jue, 17/03/2011 - 00:22

Hi
Your code is perfect, it looks like a bug. We will fix it in future releases.
In the mean while, I suggest to avoid this statement
Thanks, Shiri

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Imagen de Victor Umansky (Intel)
Victor Umansky (Intel)
Dom, 10/04/2011 - 00:28

Hi,

There is an ambiguity in select() function defintion in OCL 1.1. spec. It doesn't mention explicitely that exp3 must be of the same vector size and element size (in bits) as exp1 and exp2. That means that the folowing usages are valid:

select( double, double, long)
select( char, char, char)

while the following usages are invalid:
select( double, double, int)
select( char, char, int)

In the future, the spec will be updated with the "refined" definition (adding explicit same-sizeconstraint).

Consequently, the behaviour of Intel SDK w.r.t. select parameter type scope is correct.

Victor

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