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Error when specifying max work group size

Altera_Forum
Honored Contributor II
1,211 Views

Hi everyone, 

 

I just find out that whenever I try to add max_work_group_size(X, Y, Z) attribute to a kernel I get the following error: 

 

"error: attribute takes one argument" 

 

Not even the example supplied by the programming guide compiles: 

 

"aoc -v -c sum.claoc: Environment checks are completed successfully. 

aoc: Selected target board de5net_a7 

aoc: Running OpenCL parser.... 

c:/Users/RT/Desktop/sum.cl:1:16: error: attribute takes one argument 

__attribute__((max_work_group_size(64,1,1))) 

1 error generated. 

Error: OpenCL parser FAILED. 

Refer to sum/sum.log for details." 

 

Where the ^ pointer points at letter 'm' of "max_work_group_size". 

This is the source code from the example by the way: 

 

"__attribute__((max_work_group_size(64,1,1))) 

__kernel void sum (__global const float * restrict a, 

__global const float * restrict b, 

__global float * restrict answer) 

size_t gid = get_global_id(0); 

answer[gid] = a[gid] + b[gid]; 

}" 

 

This happens on both Linux and windows version 15 of AOCL, but "reqd_work_group_size(X, Y, Z)" works just fine. 

 

I don't know if this is a bug of the compiler or am I missing something? 

 

Thanks in advance!
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2 Replies
Altera_Forum
Honored Contributor II
152 Views

Hi, 

the syntax of the attribute should be __attribute__((max_work_group_size(SIZE)),so just one argument as the compiler error suggested. 

 

Cheers, 

Sergio
Altera_Forum
Honored Contributor II
152 Views

Thanks Sergio! I discovered this sometime ago but I forgot to update the thread... 

 

Cheers, 

Ryan
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