[Mesa-dev] [PATCH] nv50/ir: fix texture barriers insertion with combined load/store

[Samuel Pitoiset]

After the MemoryOpt pass, load and store instructions might have been
combined and we have to take this in account when detecting if the
destination register of a texture instruction is used by another
instruction as srcs/defs.

This fixes 11 dEQP-GLES31 subtests:
dEQP-GLES3.functional.shaders.opaque_type_indexing.sampler.*.vertex.*

There are still some samplers shadow fails with compute shaders but
this is most likely an other issue because the barriers seem to be
correctly added with this fix.

This might also fix some rendering issues in real games.

Fixes: 7752bbc ("gk104/ir: simplify and fool-proof texbar algorithm")
Signed-off-by: Samuel Pitoiset <samuel.pitoiset at gmail.com>
Cc: "11.1 11.2" <mesa-stable at lists.freedesktop.org>
---
 src/gallium/drivers/nouveau/codegen/nv50_ir_lowering_nvc0.cpp | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/src/gallium/drivers/nouveau/codegen/nv50_ir_lowering_nvc0.cpp b/src/gallium/drivers/nouveau/codegen/nv50_ir_lowering_nvc0.cpp
index 3bce962..15864c8 100644
--- a/src/gallium/drivers/nouveau/codegen/nv50_ir_lowering_nvc0.cpp
+++ b/src/gallium/drivers/nouveau/codegen/nv50_ir_lowering_nvc0.cpp
@@ -226,8 +226,11 @@ NVC0LegalizePostRA::findFirstUsesBB(
          continue;
 
       for (int d = 0; insn->defExists(d); ++d) {
+         int numGPR = insn->def(d).rep()->reg.size / 4;
+
          if (insn->def(d).getFile() != FILE_GPR ||
-             insn->def(d).rep()->reg.data.id < minGPR ||
+             (insn->def(d).rep()->reg.data.id < minGPR &&
+              insn->def(d).rep()->reg.data.id + numGPR - 1 < minGPR) ||
              insn->def(d).rep()->reg.data.id > maxGPR)
             continue;
          addTexUse(uses, insn, texi);
@@ -235,8 +238,12 @@ NVC0LegalizePostRA::findFirstUsesBB(
       }
 
       for (int s = 0; insn->srcExists(s); ++s) {
+         int numGPR = insn->src(s).rep()->reg.size / 4;
+
          if (insn->src(s).getFile() != FILE_GPR ||
-             insn->src(s).rep()->reg.data.id < minGPR ||
+             (insn->src(s).rep()->reg.data.id < minGPR &&
+              insn->src(s).rep()->reg.data.id +
+              insn->src(s).rep()->reg.data.id + numGPR - 1 < minGPR) ||
              insn->src(s).rep()->reg.data.id > maxGPR)
             continue;
          addTexUse(uses, insn, texi);
-- 
2.8.0