i965: Move postprocess_nir to codegen time

This allows us to insert NIR passes between initial NIR compilation and
optimization (link time) and actual backend code-gen.  In particular, it
will allow us to do shader variants in NIR and share some of that shader
variant code between backends.

Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>

4 files changed, 20 insertions, 5 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp b/src/mesa/drivers/dri/i965/brw_fs.cpp
index 7376f95..e9e3d4d 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"
@@ -5430,13 +5431,16 @@ 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);
+   shader = brw_postprocess_nir(shader, compiler->devinfo, true);
+
    /* key->alpha_test_func means simulating alpha testing via discards,
     * so the shader definitely kills pixels.
     */
@@ -5589,11 +5593,14 @@ 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);
+   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 b9d523d..1696953 100644
--- a/src/mesa/drivers/dri/i965/brw_nir.c
+++ b/src/mesa/drivers/dri/i965/brw_nir.c
@@ -412,7 +412,6 @@ brw_create_nir(struct brw_context *brw,
 
    nir = brw_preprocess_nir(nir, is_scalar);
    nir = brw_lower_nir(nir, devinfo, shader_prog, is_scalar);
-   nir = 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 44893e3..bf40a58 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4.cpp
+++ b/src/mesa/drivers/dri/i965/brw_vec4.cpp
@@ -1931,13 +1931,17 @@ 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);
+   shader = brw_postprocess_nir(shader, compiler->devinfo,
+                                compiler->scalar_stage[MESA_SHADER_VERTEX]);
+
    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 89e4996..7174ee9 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 {
 
@@ -606,7 +607,7 @@ 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,
@@ -616,6 +617,10 @@ 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);
+   shader = brw_postprocess_nir(shader, compiler->devinfo,
+                                compiler->scalar_stage[MESA_SHADER_GEOMETRY]);
+
    prog_data->include_primitive_id =
       (shader->info.inputs_read & VARYING_BIT_PRIMITIVE_ID) != 0;