Mesa (master): aco: either copy-propagate or inline create_vector operands

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Module: Mesa
Branch: master
Commit: 37e89e30276724932328edb7b8bf4909606052d1
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=37e89e30276724932328edb7b8bf4909606052d1

Author: Daniel Schürmann <daniel at schuermann.dev>
Date:   Wed May  6 17:24:38 2020 +0100

aco: either copy-propagate or inline create_vector operands

Don't do both at the same time as it breaks DCE

Fixes: 2dc550202e82c5da198ad0a416a5d24dd89addd8 ('aco: copy-propagate p_create_vector copies of vectors')
Fixes: dEQP-VK.glsl.builtin.precision_double.ldexp.compute.scalar on GFX6-GFX7

Reviewed-by: Rhys Perry <pendingchaos02 at gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4922>

---

 src/amd/compiler/aco_optimizer.cpp | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/src/amd/compiler/aco_optimizer.cpp b/src/amd/compiler/aco_optimizer.cpp
index 0543d38a3fa..9203f1c4b43 100644
--- a/src/amd/compiler/aco_optimizer.cpp
+++ b/src/amd/compiler/aco_optimizer.cpp
@@ -898,9 +898,12 @@ void label_instruction(opt_ctx &ctx, Block& block, aco_ptr<Instruction>& instr)
 
    switch (instr->opcode) {
    case aco_opcode::p_create_vector: {
-      bool copy_prop = instr->operands.size() == 1 && instr->operands[0].isTemp();
-      if (copy_prop)
+      bool copy_prop = instr->operands.size() == 1 && instr->operands[0].isTemp() &&
+                       instr->operands[0].regClass() == instr->definitions[0].regClass();
+      if (copy_prop) {
          ctx.info[instr->definitions[0].tempId()].set_temp(instr->operands[0].getTemp());
+         break;
+      }
 
       unsigned num_ops = instr->operands.size();
       for (const Operand& op : instr->operands) {
@@ -928,8 +931,7 @@ void label_instruction(opt_ctx &ctx, Block& block, aco_ptr<Instruction>& instr)
          assert(k == num_ops);
       }
 
-      if (!copy_prop)
-         ctx.info[instr->definitions[0].tempId()].set_vec(instr.get());
+      ctx.info[instr->definitions[0].tempId()].set_vec(instr.get());
       break;
    }
    case aco_opcode::p_split_vector: {