Mesa (master): aco: improve SCC handling in some SALU combines

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Module: Mesa
Branch: master
Commit: 483d4ec57ce0ca0df26fffea648d52a738c8f4e0
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=483d4ec57ce0ca0df26fffea648d52a738c8f4e0

Author: Rhys Perry <pendingchaos02 at gmail.com>
Date:   Tue Jan 28 12:05:26 2020 +0000

aco: improve SCC handling in some SALU combines

Add some checks and remove some unnecessary checks.

Found by observation. No pipeline-db changes.

Signed-off-by: Rhys Perry <pendingchaos02 at gmail.com>
Reviewed-by: Daniel Schürmann <daniel at schuermann.dev>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3599>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3599>

---

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

diff --git a/src/amd/compiler/aco_optimizer.cpp b/src/amd/compiler/aco_optimizer.cpp
index c729cbc68f4..42fef6f9a24 100644
--- a/src/amd/compiler/aco_optimizer.cpp
+++ b/src/amd/compiler/aco_optimizer.cpp
@@ -1848,9 +1848,6 @@ bool combine_salu_not_bitwise(opt_ctx& ctx, aco_ptr<Instruction>& instr)
  * s_or_b64(a, s_not_b64(b)) -> s_orn2_b64(a, b) */
 bool combine_salu_n2(opt_ctx& ctx, aco_ptr<Instruction>& instr)
 {
-   if (instr->definitions[1].isTemp() && ctx.uses[instr->definitions[1].tempId()])
-      return false;
-
    if (instr->definitions[0].isTemp() && ctx.info[instr->definitions[0].tempId()].is_uniform_bool())
       return false;
 
@@ -1858,7 +1855,7 @@ bool combine_salu_n2(opt_ctx& ctx, aco_ptr<Instruction>& instr)
       Instruction *op2_instr = follow_operand(ctx, instr->operands[i]);
       if (!op2_instr || (op2_instr->opcode != aco_opcode::s_not_b32 && op2_instr->opcode != aco_opcode::s_not_b64))
          continue;
-      if (fixed_to_exec(op2_instr->operands[0]))
+      if (ctx.uses[op2_instr->definitions[1].tempId()] || fixed_to_exec(op2_instr->operands[0]))
          continue;
 
       if (instr->operands[!i].isLiteral() && op2_instr->operands[0].isLiteral() &&
@@ -1895,12 +1892,13 @@ bool combine_salu_n2(opt_ctx& ctx, aco_ptr<Instruction>& instr)
 /* s_add_{i32,u32}(a, s_lshl_b32(b, <n>)) -> s_lshl<n>_add_u32(a, b) */
 bool combine_salu_lshl_add(opt_ctx& ctx, aco_ptr<Instruction>& instr)
 {
-   if (instr->definitions[1].isTemp() && ctx.uses[instr->definitions[1].tempId()])
+   if (instr->opcode == aco_opcode::s_add_i32 && ctx.uses[instr->definitions[1].tempId()])
       return false;
 
    for (unsigned i = 0; i < 2; i++) {
       Instruction *op2_instr = follow_operand(ctx, instr->operands[i]);
-      if (!op2_instr || op2_instr->opcode != aco_opcode::s_lshl_b32)
+      if (!op2_instr || op2_instr->opcode != aco_opcode::s_lshl_b32 ||
+          ctx.uses[op2_instr->definitions[1].tempId()])
          continue;
       if (!op2_instr->operands[1].isConstant() || fixed_to_exec(op2_instr->operands[0]))
          continue;