On Thu, Mar 17, 2016 at 10:21 AM, Jason Ekstrand <ja...@jlekstrand.net> wrote:
> NIR already has this optimization and it can do much better than the little
> peephole in the backend.
>
> No shader-db change on Broadwell.
> ---
> src/mesa/drivers/dri/i965/brw_fs.cpp | 11 -----------
> 1 file changed, 11 deletions(-)
>
> diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp
> b/src/mesa/drivers/dri/i965/brw_fs.cpp
> index 86d2bd9..ba6ae59 100644
> --- a/src/mesa/drivers/dri/i965/brw_fs.cpp
> +++ b/src/mesa/drivers/dri/i965/brw_fs.cpp
> @@ -2274,17 +2274,6 @@ fs_visitor::opt_algebraic()
> progress = true;
> }
> break;
> - case SHADER_OPCODE_RCP: {
> - fs_inst *prev = (fs_inst *)inst->prev;
> - if (prev->opcode == SHADER_OPCODE_SQRT) {
> - if (inst->src[0].equals(prev->dst)) {
> - inst->opcode = SHADER_OPCODE_RSQ;
> - inst->src[0] = prev->src[0];
> - progress = true;
> - }
> - }
> - break;
> - }
Do this in the vec4 backend as well, and with no shader-db regressions on HSW:
Reviewed-by: Matt Turner <matts...@gmail.com>
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