[Mesa-dev] [PATCH] R600/SI: allow 4 more input SGPRs to a shader

[Christian König]

That won't work correctly, the hardware can only load a maximum of 16 
user SGPRs at shader initialization. If we need more we need to pass the 
data through an extra buffer or something like that.

Christian.

Am 26.04.2014 15:37, schrieb Marek Olšák:
> Sorry, the subject should say "5 more input SGPRs".
>
> Marek
>
> On Sat, Apr 26, 2014 at 3:36 PM, Marek Olšák <maraeo at gmail.com> wrote:
>> From: Marek Olšák <marek.olsak at amd.com>
>>
>> Mesa needs one more SGPR, let's add 5 then, because it's a recurring issue.
>>
>> This is silly. Why cannot Mesa specify the calling convention?
>> Now I have to break transform feedback to support ARB_draw_indirect until
>> this patch is released. Or I'll have to wait until the release and then
>> merge ARB_draw_indirect support.
>>
>> Signed-off-by: Marek Olšák <marek.olsak at amd.com>
>> ---
>>   lib/Target/R600/AMDGPUCallingConv.td | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/lib/Target/R600/AMDGPUCallingConv.td b/lib/Target/R600/AMDGPUCallingConv.td
>> index 65cdb24..5f8ad8c 100644
>> --- a/lib/Target/R600/AMDGPUCallingConv.td
>> +++ b/lib/Target/R600/AMDGPUCallingConv.td
>> @@ -20,7 +20,7 @@ def CC_SI : CallingConv<[
>>     CCIfInReg<CCIfType<[f32, i32] , CCAssignToReg<[
>>       SGPR0, SGPR1, SGPR2, SGPR3, SGPR4, SGPR5, SGPR6, SGPR7,
>>       SGPR8, SGPR9, SGPR10, SGPR11, SGPR12, SGPR13, SGPR14, SGPR15,
>> -    SGPR16
>> +    SGPR16, SGPR17, SGPR18, SGPR19, SGPR20, SGPR21
>>     ]>>>,
>>
>>     CCIfInReg<CCIfType<[i64] , CCAssignToRegWithShadow<
>> --
>> 1.8.3.2
>>
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