[Beignet] [BUG] Built-in function get_global_size error

[Sun, Yi]

Hi Zhigang,

So surprising here I'm!  I have found the issue that we're using the
different version of OpenCL. Mine is 1.0 but I assume you're using v1.2.
Because I compared the description of this function, in v1.2 it should
return 1 while out-of range, but in v1.0 get_global_size return 0
contrarily. Attachment is the screen-shot for the function description
in v1.0.

So should we use OpenCL version 1.2 specification but not v1.0?

Thanks
  --Sun, Yi

On Sat, 2013-06-08 at 18:26 +0800, Zhigang Gong wrote:
> Yi,
> 
> Thanks for the test case. One comment here, according to the Open CL spec:
> 
> size_t get_global_size (uint dimindx) 
> 
> Returns the number of global work-items specified for
> dimension identified by dimindx. This value is given by
> the global_work_size argument to clEnqueueNDRangeKernel.
> Valid values of dimindx are 0 to get_work_dim() – 1.
> For other values of dimindx, get_global_size() returns 1.
> For clEnqueueTask, this always returns 1.
> 
> For the out-of-range dim argument, it should return 1 rather than 0.
> You may need to modify your case to comply with the spec.
> 
> And I took a look at the GBE side, we do have bugs here. And I wrote a patch
> embedded here to fix it, after you modify your test case. You can try it with
> my patch as below:
> 
> From 83239b8fd74b99a4efae222916fd10cd68bf7bce Mon Sep 17 00:00:00 2001
> From: Zhigang Gong <zhigang.gong at linux.intel.com>
> Date: Sat, 8 Jun 2013 18:10:11 +0800
> Subject: [PATCH] GBE: Fix some builtin functions' return value.
> 
> Signed-off-by: Zhigang Gong <zhigang.gong at linux.intel.com>
> ---
>  backend/src/ocl_stdlib.h | 29 ++++++++++++++++-------------
>  1 file changed, 16 insertions(+), 13 deletions(-)
> 
> diff --git a/backend/src/ocl_stdlib.h b/backend/src/ocl_stdlib.h
> index 013f4cc..77499d7 100644
> --- a/backend/src/ocl_stdlib.h
> +++ b/backend/src/ocl_stdlib.h
> @@ -374,19 +374,22 @@ DECL_INTERNAL_WORK_ITEM_FN(get_global_offset)
>  DECL_INTERNAL_WORK_ITEM_FN(get_num_groups)
>  #undef DECL_INTERNAL_WORK_ITEM_FN
>  
> -#define DECL_PUBLIC_WORK_ITEM_FN(NAME) \
> -INLINE unsigned NAME(unsigned int dim) { \
> -  if (dim == 0) return __gen_ocl_##NAME##0(); \
> -  else if (dim == 1) return __gen_ocl_##NAME##1(); \
> -  else if (dim == 2) return __gen_ocl_##NAME##2(); \
> -  else return 0; \
> -}
> -DECL_PUBLIC_WORK_ITEM_FN(get_group_id)
> -DECL_PUBLIC_WORK_ITEM_FN(get_local_id)
> -DECL_PUBLIC_WORK_ITEM_FN(get_local_size)
> -DECL_PUBLIC_WORK_ITEM_FN(get_global_size)
> -DECL_PUBLIC_WORK_ITEM_FN(get_global_offset)
> -DECL_PUBLIC_WORK_ITEM_FN(get_num_groups)
> +#define DECL_PUBLIC_WORK_ITEM_FN(NAME, OTHER_RET)    \
> +INLINE unsigned NAME(unsigned int dim) {             \
> +  if (dim == 0) return __gen_ocl_##NAME##0();        \
> +  else if (dim > 0 && dim < get_work_dim()) {        \
> +    if (dim == 1) return __gen_ocl_##NAME##1();      \
> +    else if (dim == 2) return __gen_ocl_##NAME##2(); \
> +  }                                                  \
> +  return OTHER_RET;                                  \
> +}
> +
> +DECL_PUBLIC_WORK_ITEM_FN(get_group_id, 0)
> +DECL_PUBLIC_WORK_ITEM_FN(get_local_id, 0)
> +DECL_PUBLIC_WORK_ITEM_FN(get_local_size, 1)
> +DECL_PUBLIC_WORK_ITEM_FN(get_global_size, 1)
> +DECL_PUBLIC_WORK_ITEM_FN(get_global_offset, 0)
> +DECL_PUBLIC_WORK_ITEM_FN(get_num_groups, 1)
>  #undef DECL_PUBLIC_WORK_ITEM_FN
>  
>  INLINE uint get_global_id(uint dim) {

-------------- next part --------------
A non-text attachment was scrubbed...
Name: get_global_size.png
Type: image/png
Size: 286457 bytes
Desc: get_global_size.png
URL: <http://lists.freedesktop.org/archives/beignet/attachments/20130609/b38a1209/attachment-0001.png>