From 923005bf5494264cddd0d7b886b43cb223c720b1 Mon Sep 17 00:00:00 2001
From: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Date: Tue, 14 Jan 2020 18:46:36 +0100
Subject: [PATCH] aco: do not select 96-bit/128-bit variants for
 ds_read/ds_write on GFX6
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Only GFX7 and later support large ds_read/ds_write.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Daniel Schürmann <daniel@schuermann.dev>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3412>
---
 src/amd/compiler/aco_instruction_selection.cpp | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/src/amd/compiler/aco_instruction_selection.cpp b/src/amd/compiler/aco_instruction_selection.cpp
index abd7ffd..aeec2f9 100644
--- a/src/amd/compiler/aco_instruction_selection.cpp
+++ b/src/amd/compiler/aco_instruction_selection.cpp
@@ -2759,6 +2759,7 @@ void load_lds(isel_context *ctx, unsigned elem_size_bytes, Temp dst,
    unsigned result_size = 0;
    unsigned total_bytes = num_components * elem_size_bytes;
    std::array<Temp, NIR_MAX_VEC_COMPONENTS> result;
+   bool large_ds_read = ctx->options->chip_class >= GFX7;
 
    while (bytes_read < total_bytes) {
       unsigned todo = total_bytes - bytes_read;
@@ -2767,14 +2768,14 @@ void load_lds(isel_context *ctx, unsigned elem_size_bytes, Temp dst,
 
       aco_opcode op = aco_opcode::last_opcode;
       bool read2 = false;
-      if (todo >= 16 && aligned16) {
+      if (todo >= 16 && aligned16 && large_ds_read) {
          op = aco_opcode::ds_read_b128;
          todo = 16;
       } else if (todo >= 16 && aligned8) {
          op = aco_opcode::ds_read2_b64;
          read2 = true;
          todo = 16;
-      } else if (todo >= 12 && aligned16) {
+      } else if (todo >= 12 && aligned16 && large_ds_read) {
          op = aco_opcode::ds_read_b96;
          todo = 12;
       } else if (todo >= 8 && aligned8) {
@@ -2884,6 +2885,8 @@ void ds_write_helper(isel_context *ctx, Operand m, Temp address, Temp data, unsi
 {
    Builder bld(ctx->program, ctx->block);
    unsigned bytes_written = 0;
+   bool large_ds_write = ctx->options->chip_class >= GFX7;
+
    while (bytes_written < total_size * 4) {
       unsigned todo = total_size * 4 - bytes_written;
       bool aligned8 = bytes_written % 8 == 0 && align % 8 == 0;
@@ -2892,14 +2895,14 @@ void ds_write_helper(isel_context *ctx, Operand m, Temp address, Temp data, unsi
       aco_opcode op = aco_opcode::last_opcode;
       bool write2 = false;
       unsigned size = 0;
-      if (todo >= 16 && aligned16) {
+      if (todo >= 16 && aligned16 && large_ds_write) {
          op = aco_opcode::ds_write_b128;
          size = 4;
       } else if (todo >= 16 && aligned8) {
          op = aco_opcode::ds_write2_b64;
          write2 = true;
          size = 4;
-      } else if (todo >= 12 && aligned16) {
+      } else if (todo >= 12 && aligned16 && large_ds_write) {
          op = aco_opcode::ds_write_b96;
          size = 3;
       } else if (todo >= 8 && aligned8) {
-- 
2.7.4