[llvm] r276051 - AMDGPU: Change fdiv lowering based on !fpmath metadata

Mon Jul 25 18:08:32 PDT 2016

The IR is attached.

Marek

On Tue, Jul 26, 2016 at 3:06 AM, Matt Arsenault
<Matthew.Arsenault at amd.com> wrote:
> On 07/25/2016 06:02 PM, Marek Olšák wrote:
>>
>> On Tue, Jul 26, 2016 at 2:56 AM, Matt Arsenault
>> <Matthew.Arsenault at amd.com> wrote:
>>>
>>> On 07/25/2016 05:51 PM, Marek Olšák via llvm-commits wrote:
>>>>
>>>> The commit actually regresses code quality a lot on Tonga:
>>>>
>>>> Totals from affected shaders:
>>>> VGPRS: 488066 -> 504815 (3.43 %)
>>>> Spilled VGPRs: 278 -> 361 (29.86 %)
>>>> Scratch VGPRs: 1060 -> 1144 (7.92 %) dwords per thread
>>>> Code Size: 26675564 -> 28796812 (7.95 %) bytes
>>>> Max Waves: 105039 -> 102285 (-2.62 %)
>>>>
>>>> Marek
>>>>
>>>>
>>> Do you have an example testcase?
>>
>> I see this in the asm diff:
>>
>> -       v_rsq_f32_e32
>> +       v_sqrt_f32_e32
>> +       v_cmp_gt_f32_e64
>> +       v_cndmask_b32_e32
>> +       v_mul_f32_e32
>> +       v_rcp_f32_e32
>>
>> I guess that's better than a test case?
>>
>> Marek
>
> This might be a correct change, so I'm not 100% sure without seeing the IR
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