[Mesa-dev] [RFC] nir/builder: Add support for easily building control-flow

[Jason Ekstrand]

Only build-tested.

On Wed, Feb 15, 2017 at 8:43 AM, Jason Ekstrand <jason at jlekstrand.net>
wrote:

> ---
>  src/compiler/nir/nir_builder.h | 41 ++++++++++++++++++++++++++++++
> +++++++++++
>  1 file changed, 41 insertions(+)
>
> diff --git a/src/compiler/nir/nir_builder.h b/src/compiler/nir/nir_
> builder.h
> index 194d327..cdfc15b 100644
> --- a/src/compiler/nir/nir_builder.h
> +++ b/src/compiler/nir/nir_builder.h
> @@ -81,6 +81,47 @@ nir_builder_cf_insert(nir_builder *build, nir_cf_node
> *cf)
>     nir_cf_node_insert(build->cursor, cf);
>  }
>
> +static inline void
> +nir_push_if(nir_builder *build, nir_ssa_def *condition)
> +{
> +   nir_if *nif = nir_if_create(build->shader);
> +   nif->condition = nir_src_for_ssa(condition);
> +   nir_builder_cf_insert(build, &nif->cf_node);
> +   build->cursor = nir_before_cf_list(&nif->then_list);
> +}
> +
> +static inline void
> +nir_push_else(nir_builder *build)
> +{
> +   nir_block *block = nir_cursor_current_block(build->cursor);
> +   nir_if *nif = nir_cf_node_as_if(block->cf_node.parent);
> +   build->cursor = nir_before_cf_list(&nif->else_list);
> +}
> +
> +static inline void
> +nir_pop_if(nir_builder *build)
> +{
> +   nir_block *block = nir_cursor_current_block(build->cursor);
> +   nir_if *nif = nir_cf_node_as_if(block->cf_node.parent);
> +   build->cursor = nir_after_cf_node(&nif->cf_node);
> +}
> +
> +static inline void
> +nir_push_loop(nir_builder *build)
> +{
> +   nir_loop *loop = nir_loop_create(build->shader);
> +   nir_builder_cf_insert(build, &loop->cf_node);
> +   build->cursor = nir_before_cf_list(&loop->body);
> +}
> +
> +static inline void
> +nir_pop_loop(nir_builder *build)
> +{
> +   nir_block *block = nir_cursor_current_block(build->cursor);
> +   nir_loop *loop = nir_cf_node_as_loop(block->cf_node.parent);
> +   build->cursor = nir_after_cf_node(&loop->cf_node);
> +}
> +
>  static inline nir_ssa_def *
>  nir_ssa_undef(nir_builder *build, unsigned num_components, unsigned
> bit_size)
>  {
> --
> 2.5.0.400.gff86faf
>
>
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