[Mesa-dev] [PATCH] radeonsi/nir: enable lowering of fpow

[Samuel Pitoiset]

Reviewed-by: Samuel Pitoiset <samuel.pitoiset at gmail.com>

On 02/23/2018 07:04 AM, Timothy Arceri wrote:
> Lowering fpow in NIR rather than LLVM can be beneficial.
> 
> Polaris results:
> 
> Totals from affected shaders:
> SGPRS: 124928 -> 124896 (-0.03 %)
> VGPRS: 68616 -> 68332 (-0.41 %)
> Spilled SGPRs: 394 -> 413 (4.82 %)
> Spilled VGPRs: 0 -> 0 (0.00 %)
> Private memory VGPRs: 0 -> 0 (0.00 %)
> Scratch size: 0 -> 0 (0.00 %) dwords per thread
> Code Size: 3668912 -> 3658368 (-0.29 %) bytes
> LDS: 0 -> 0 (0.00 %) blocks
> Max Waves: 18575 -> 18593 (0.10 %)
> Wait states: 0 -> 0 (0.00 %)
> 
> Fixes: d6b753920677 "ac/nir: remove emission of nir_op_fpow"
> 
> Cc: Samuel Pitoiset <samuel.pitoiset at gmail.com>
> ---
>   src/gallium/drivers/radeonsi/si_get.c | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/src/gallium/drivers/radeonsi/si_get.c b/src/gallium/drivers/radeonsi/si_get.c
> index 18d9cec414..6e799534b2 100644
> --- a/src/gallium/drivers/radeonsi/si_get.c
> +++ b/src/gallium/drivers/radeonsi/si_get.c
> @@ -492,6 +492,7 @@ static const struct nir_shader_compiler_options nir_options = {
>   	.lower_scmp = true,
>   	.lower_flrp32 = true,
>   	.lower_flrp64 = true,
> +	.lower_fpow = true,
>   	.lower_fsat = true,
>   	.lower_fdiv = true,
>   	.lower_sub = true,
>