[Mesa-dev] [PATCH 1/2] ac/shader: scan vertex inputs usage mask

[Samuel Pitoiset]

Signed-off-by: Samuel Pitoiset <samuel.pitoi...@gmail.com>
---
 src/amd/common/ac_shader_info.c | 13 +++++++++++++
 src/amd/common/ac_shader_info.h |  3 +++
 2 files changed, 16 insertions(+)

diff --git a/src/amd/common/ac_shader_info.c b/src/amd/common/ac_shader_info.c
index d771cd250d..e713263817 100644
--- a/src/amd/common/ac_shader_info.c
+++ b/src/amd/common/ac_shader_info.c
@@ -133,6 +133,19 @@ gather_intrinsic_info(const nir_shader *nir, const 
nir_intrinsic_instr *instr,
                if (nir->info.stage == MESA_SHADER_FRAGMENT)
                        info->ps.writes_memory = true;
                break;
+       case nir_intrinsic_load_var:
+               if (nir->info.stage == MESA_SHADER_VERTEX) {
+                       nir_deref_var *dvar = instr->variables[0];
+                       nir_variable *var = dvar->var;
+
+                       if (var->data.mode == nir_var_shader_in) {
+                               unsigned idx = var->data.location;
+                               uint8_t mask =
+                                       
nir_ssa_def_components_read(&instr->dest.ssa);
+                               info->vs.input_usage_mask[idx] |= mask;
+                       }
+               }
+               break;
        default:
                break;
        }
diff --git a/src/amd/common/ac_shader_info.h b/src/amd/common/ac_shader_info.h
index 59b749576a..380c06a855 100644
--- a/src/amd/common/ac_shader_info.h
+++ b/src/amd/common/ac_shader_info.h
@@ -24,6 +24,8 @@
 #ifndef AC_SHADER_INFO_H
 #define AC_SHADER_INFO_H
 
+#include "compiler/shader_enums.h"
+
 struct nir_shader;
 struct ac_nir_compiler_options;
 
@@ -34,6 +36,7 @@ struct ac_shader_info {
        bool uses_invocation_id;
        bool uses_prim_id;
        struct {
+               uint8_t input_usage_mask[VERT_ATTRIB_MAX];
                bool has_vertex_buffers; /* needs vertex buffers and base/start 
*/
                bool needs_draw_id;
                bool needs_instance_id;
-- 
2.16.1

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