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

[Marek Olšák via llvm-commits]

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