pan/bi: Pass LD_VAR update mode explicitly

Let the compiler pass the update mode instead of inferring from the
constant value.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7636>

5 files changed, 21 insertions, 10 deletions

diff --git a/src/panfrost/bifrost/bi_print.c b/src/panfrost/bifrost/bi_print.c
index db86fb055f0..c546bd6af7f 100644
--- a/src/panfrost/bifrost/bi_print.c
+++ b/src/panfrost/bifrost/bi_print.c
@@ -245,6 +245,14 @@ bi_print_load_vary(struct bi_load_vary *load, FILE *fp)
 
         if (load->flat)
                 fprintf(fp, ".flat");
+
+        switch (load->update_mode) {
+        case BIFROST_UPDATE_STORE: fprintf(fp, ".store"); break;
+        case BIFROST_UPDATE_RETRIEVE: fprintf(fp, ".retrieve"); break;
+        case BIFROST_UPDATE_CONDITIONAL: fprintf(fp, ".conditional"); break;
+        case BIFROST_UPDATE_CLOBBER: fprintf(fp, ".conditional"); break;
+        default: unreachable("Invalid update mode");
+        }
 }
 
 const char *
diff --git a/src/panfrost/bifrost/bifrost.h b/src/panfrost/bifrost/bifrost.h
index a0d7d7fbc73..64ded49c7a1 100644
--- a/src/panfrost/bifrost/bifrost.h
+++ b/src/panfrost/bifrost/bifrost.h
@@ -228,6 +228,13 @@ enum bifrost_interp_mode {
         BIFROST_INTERP_NONE = 0x4,
 };
 
+enum bifrost_update_mode {
+        BIFROST_UPDATE_STORE,
+        BIFROST_UPDATE_RETRIEVE,
+        BIFROST_UPDATE_CONDITIONAL,
+        BIFROST_UPDATE_CLOBBER,
+};
+
 /* Fixed location for gl_FragCoord.zw */
 #define BIFROST_FRAGZ (23)
 #define BIFROST_FRAGW (22)
diff --git a/src/panfrost/bifrost/bifrost_compile.c b/src/panfrost/bifrost/bifrost_compile.c
index c4604855da4..32429b0ae26 100644
--- a/src/panfrost/bifrost/bifrost_compile.c
+++ b/src/panfrost/bifrost/bifrost_compile.c
@@ -567,6 +567,7 @@ bi_emit_ld_frag_coord(bi_context *ctx, nir_intrinsic_instr *instr)
                         .type = BI_LOAD_VAR,
                         .load_vary = {
                                 .interp_mode = BIFROST_INTERP_CENTER,
+                                .update_mode = BIFROST_UPDATE_CLOBBER,
                                 .reuse = false,
                                 .flat = true
                         },
@@ -724,6 +725,9 @@ bi_emit_point_coord(bi_context *ctx, nir_intrinsic_instr *instr)
 {
         bi_instruction ins = {
                 .type = BI_LOAD_VAR,
+                .load_vary = {
+                        .update_mode = BIFROST_UPDATE_CLOBBER,
+                },
                 .vector_channels = 2,
                 .dest = pan_dest_index(&instr->dest),
                 .dest_type = nir_type_float32,
diff --git a/src/panfrost/bifrost/compiler.h b/src/panfrost/bifrost/compiler.h
index c044b5803ed..1eb3149efe6 100644
--- a/src/panfrost/bifrost/compiler.h
+++ b/src/panfrost/bifrost/compiler.h
@@ -134,6 +134,7 @@ extern unsigned bi_class_props[BI_NUM_CLASSES];
 /* BI_LD_VARY */
 struct bi_load_vary {
         enum bifrost_interp_mode interp_mode;
+        enum bifrost_update_mode update_mode;
         bool reuse;
         bool flat;
 };
diff --git a/src/panfrost/bifrost/gen_pack.py b/src/panfrost/bifrost/gen_pack.py
index e9025ae3fbc..93ee42020ac 100644
--- a/src/panfrost/bifrost/gen_pack.py
+++ b/src/panfrost/bifrost/gen_pack.py
@@ -215,15 +215,6 @@ def pack_seg(mod, opts, body, pack_exprs):
     else:
         assert(False)
 
-# TODO: Update modes (perf / slow) For now just force store, except for special
-# varyings for which we force clobber
-def pack_update(mod, opts, body, pack_exprs):
-    if opts == ['store', 'retrieve', 'conditional', 'clobber']:
-        return '(ins->constant.u64 >= 20) ? 3 : 0'
-    else:
-        assert(opts[0] == 'store')
-        return '0'
-
 # Processes modifiers. If used directly, emits a pack. Otherwise, just
 # processes the value (grabbing it from the IR). This must sync with the IR.
 
@@ -273,7 +264,7 @@ modifier_map = {
         "not_result": pack_not_result,
         "register_format": pack_register_format,
         "seg": pack_seg,
-        "update": pack_update,
+        "update": lambda a,b,c,d: 'ins->load_vary.update_mode',
 
         # Just a minus one modifier
         "vecsize": lambda a,b,c,d: 'ins->vector_channels - 1',