[Mesa-dev] [PATCH 07/11] i965: Move postprocess_nir to codegen time
Iago Toral
itoral at igalia.com
Mon Nov 16 02:01:47 PST 2015
On Fri, 2015-11-13 at 07:34 -0800, Jason Ekstrand wrote:
>
> On Nov 13, 2015 5:53 AM, "Iago Toral" <itoral at igalia.com> wrote:
> >
> > On Wed, 2015-11-11 at 17:26 -0800, Jason Ekstrand wrote:
> > > ---
> > > src/mesa/drivers/dri/i965/brw_fs.cpp | 11
> +++++++++--
> > > src/mesa/drivers/dri/i965/brw_nir.c | 1 -
> > > src/mesa/drivers/dri/i965/brw_vec4.cpp | 5 ++++-
> > > src/mesa/drivers/dri/i965/brw_vec4_gs_visitor.cpp | 6 +++++-
> > > 4 files changed, 18 insertions(+), 5 deletions(-)
> > >
> > > diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp
> b/src/mesa/drivers/dri/i965/brw_fs.cpp
> > > index ad94fa4..b8713ab 100644
> > > --- a/src/mesa/drivers/dri/i965/brw_fs.cpp
> > > +++ b/src/mesa/drivers/dri/i965/brw_fs.cpp
> > > @@ -43,6 +43,7 @@
> > > #include "brw_wm.h"
> > > #include "brw_fs.h"
> > > #include "brw_cs.h"
> > > +#include "brw_nir.h"
> > > #include "brw_vec4_gs_visitor.h"
> > > #include "brw_cfg.h"
> > > #include "brw_dead_control_flow.h"
> > > @@ -5459,13 +5460,16 @@ brw_compile_fs(const struct brw_compiler
> *compiler, void *log_data,
> > > void *mem_ctx,
> > > const struct brw_wm_prog_key *key,
> > > struct brw_wm_prog_data *prog_data,
> > > - const nir_shader *shader,
> > > + const nir_shader *src_shader,
> > > struct gl_program *prog,
> > > int shader_time_index8, int shader_time_index16,
> > > bool use_rep_send,
> > > unsigned *final_assembly_size,
> > > char **error_str)
> > > {
> > > + nir_shader *shader = nir_shader_clone(mem_ctx, src_shader);
> > > + brw_postprocess_nir(shader, compiler->devinfo, true);
> > > +
> >
> > Maybe it is a silly question, but why do we need to clone the shader
> to
> > do this?
>
> Because brw_compile_foo may be called multiple times on the same
> shader source. Since brw_postprocess_nir alters the shader source, we
> need to make a copy.
Ok, trying to see if I get the big picture of the series:
So the situation before this change is that we were running
brw_postprocess_nir in brw_create_nir (so at link-time) before we ran
brw_compile_foo (at codegen/drawing time), and thus, we never had this
problem. We still had to fix codegen for texture rectangle when drawing
though, which we were doing with rescale_texcoord().
With this change, we handle texture rectangle in brw_postprocess_nir()
so we don't need rescale_texcoord() any more, however, this needs to be
done at codegen time anyway, so as a consequence, now we have to move
all of brw_postprocess_nir there and we have to clone the NIR shader.
Did I get it right?
If I did then I wonder about the performance impact of this change,
since codegen happens when we draw and there is plenty of things
happening in brw_postprocess_nir (plus the cloning). Is it worth it?
> > > /* key->alpha_test_func means simulating alpha testing via
> discards,
> > > * so the shader definitely kills pixels.
> > > */
> > > @@ -5618,11 +5622,14 @@ brw_compile_cs(const struct brw_compiler
> *compiler, void *log_data,
> > > void *mem_ctx,
> > > const struct brw_cs_prog_key *key,
> > > struct brw_cs_prog_data *prog_data,
> > > - const nir_shader *shader,
> > > + const nir_shader *src_shader,
> > > int shader_time_index,
> > > unsigned *final_assembly_size,
> > > char **error_str)
> > > {
> > > + nir_shader *shader = nir_shader_clone(mem_ctx, src_shader);
> > > + brw_postprocess_nir(shader, compiler->devinfo, true);
> > > +
> > > prog_data->local_size[0] = shader->info.cs.local_size[0];
> > > prog_data->local_size[1] = shader->info.cs.local_size[1];
> > > prog_data->local_size[2] = shader->info.cs.local_size[2];
> > > diff --git a/src/mesa/drivers/dri/i965/brw_nir.c
> b/src/mesa/drivers/dri/i965/brw_nir.c
> > > index 21c2648..693b9cd 100644
> > > --- a/src/mesa/drivers/dri/i965/brw_nir.c
> > > +++ b/src/mesa/drivers/dri/i965/brw_nir.c
> > > @@ -391,7 +391,6 @@ brw_create_nir(struct brw_context *brw,
> > >
> > > brw_preprocess_nir(nir, is_scalar);
> > > brw_lower_nir(nir, devinfo, shader_prog, is_scalar);
> > > - brw_postprocess_nir(nir, devinfo, is_scalar);
> > >
> > > return nir;
> > > }
> > > diff --git a/src/mesa/drivers/dri/i965/brw_vec4.cpp
> b/src/mesa/drivers/dri/i965/brw_vec4.cpp
> > > index 8350a02..9f75bb6 100644
> > > --- a/src/mesa/drivers/dri/i965/brw_vec4.cpp
> > > +++ b/src/mesa/drivers/dri/i965/brw_vec4.cpp
> > > @@ -2028,13 +2028,16 @@ brw_compile_vs(const struct brw_compiler
> *compiler, void *log_data,
> > > void *mem_ctx,
> > > const struct brw_vs_prog_key *key,
> > > struct brw_vs_prog_data *prog_data,
> > > - const nir_shader *shader,
> > > + const nir_shader *src_shader,
> > > gl_clip_plane *clip_planes,
> > > bool use_legacy_snorm_formula,
> > > int shader_time_index,
> > > unsigned *final_assembly_size,
> > > char **error_str)
> > > {
> > > + nir_shader *shader = nir_shader_clone(mem_ctx, src_shader);
> > > + brw_postprocess_nir(shader, compiler->devinfo,
> compiler->scalar_vs);
> > > +
> > > const unsigned *assembly = NULL;
> > >
> > > unsigned nr_attributes =
> _mesa_bitcount_64(prog_data->inputs_read);
> > > diff --git a/src/mesa/drivers/dri/i965/brw_vec4_gs_visitor.cpp
> b/src/mesa/drivers/dri/i965/brw_vec4_gs_visitor.cpp
> > > index 49c1083..92b15d9 100644
> > > --- a/src/mesa/drivers/dri/i965/brw_vec4_gs_visitor.cpp
> > > +++ b/src/mesa/drivers/dri/i965/brw_vec4_gs_visitor.cpp
> > > @@ -30,6 +30,7 @@
> > > #include "brw_vec4_gs_visitor.h"
> > > #include "gen6_gs_visitor.h"
> > > #include "brw_fs.h"
> > > +#include "brw_nir.h"
> > >
> > > namespace brw {
> > >
> > > @@ -604,7 +605,7 @@ brw_compile_gs(const struct brw_compiler
> *compiler, void *log_data,
> > > void *mem_ctx,
> > > const struct brw_gs_prog_key *key,
> > > struct brw_gs_prog_data *prog_data,
> > > - const nir_shader *shader,
> > > + const nir_shader *src_shader,
> > > struct gl_shader_program *shader_prog,
> > > int shader_time_index,
> > > unsigned *final_assembly_size,
> > > @@ -614,6 +615,9 @@ brw_compile_gs(const struct brw_compiler
> *compiler, void *log_data,
> > > memset(&c, 0, sizeof(c));
> > > c.key = *key;
> > >
> > > + nir_shader *shader = nir_shader_clone(mem_ctx, src_shader);
> > > + brw_postprocess_nir(shader, compiler->devinfo,
> compiler->scalar_gs);
> > > +
> > > prog_data->include_primitive_id =
> > > (shader->info.inputs_read & VARYING_BIT_PRIMITIVE_ID) != 0;
> > >
> >
> >
>
>
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