[Mesa-dev] [PATCH 04/13] radeonsi: enable LLVM optimizations that assume no NaNs for non-compute shaders

[Marek Olšák]

Neither. It's because we use DX10_CLAMP, which converts NaNs to 0.

Marek

On Wed, Jan 7, 2015 at 12:51 AM, Tom Stellard <tom at stellard.net> wrote:
> On Mon, Jan 05, 2015 at 12:18:43AM +0100, Marek Olšák wrote:
>> From: Marek Olšák <marek.olsak at amd.com>
>>
>> ---
>>  src/gallium/drivers/radeon/radeon_llvm_emit.c | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/src/gallium/drivers/radeon/radeon_llvm_emit.c b/src/gallium/drivers/radeon/radeon_llvm_emit.c
>> index dc871d7..e3be72c 100644
>> --- a/src/gallium/drivers/radeon/radeon_llvm_emit.c
>> +++ b/src/gallium/drivers/radeon/radeon_llvm_emit.c
>> @@ -83,6 +83,7 @@ void radeon_llvm_shader_type(LLVMValueRef F, unsigned type)
>>
>>       if (type != TGSI_PROCESSOR_COMPUTE) {
>>               LLVMAddTargetDependentFunctionAttr(F, "unsafe-fp-math", "true");
>> +             LLVMAddTargetDependentFunctionAttr(F, "enable-no-nans-fp-math", "true");
>
> Is this required by the OpenGL spec or is it just to fix broken/old
> games?
>
> -Tom
>
>>       }
>>  }
>>
>> --
>> 2.1.0
>>
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