On Fri, 2009-10-30 at 03:43 -0700, michal wrote:
> gallium: Add a PREDICATE register file.
>
> There's already a shader token that allows composition of predicated
> instructions (tgsi_instruction_ext_predicate). However, there is no way
> one can write to thos predicate registers in the first place.
> ---
> src/gallium/include/pipe/p_shader_tokens.h | 1 +
> 1 files changed, 1 insertions(+), 0 deletions(-)
>
> diff --git a/src/gallium/include/pipe/p_shader_tokens.h
> b/src/gallium/include/pipe/p_shader_tokens.h
> index de338c4..6aa8b27 100644
> --- a/src/gallium/include/pipe/p_shader_tokens.h
> +++ b/src/gallium/include/pipe/p_shader_tokens.h
> @@ -79,6 +79,7 @@ enum tgsi_file_type {
> TGSI_FILE_ADDRESS =6,
> TGSI_FILE_IMMEDIATE =7,
> TGSI_FILE_LOOP =8,
> + TGSI_FILE_PREDICATE =9,
> TGSI_FILE_COUNT /**< how many TGSI_FILE_ types */
> };
Michal,
Is your expectation that all drivers become able to understand
instructions with predicates? That seems unreasonable.
What is the expected way of setting a predicate register? What
functionality will use this?
It seems there are three ways to do conditional execution in TGSI
currently -- predicates, condition codes and IF/THEN/ELSE instructions.
I'd really prefer to have at most two, and in fact preferably just one.
Can you take a look at the three alternatives and figure out if one can
be amputated?
Ketih
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