Mesa (master): aco: create pseudo dummy instruction in RA to be used for live-range splits

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Module: Mesa
Branch: master
Commit: 5b2f628da319cdbc2811ab3964d8031ca962f80c
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=5b2f628da319cdbc2811ab3964d8031ca962f80c

Author: Daniel Schürmann <daniel at schuermann.dev>
Date:   Mon Apr 13 13:11:30 2020 +0100

aco: create pseudo dummy instruction in RA to be used for live-range splits

Reviewed-by: Rhys Perry <pendingchaos02 at gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4573>

---

 src/amd/compiler/aco_register_allocation.cpp | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/amd/compiler/aco_register_allocation.cpp b/src/amd/compiler/aco_register_allocation.cpp
index 788e3ab58e3..3857ce40721 100644
--- a/src/amd/compiler/aco_register_allocation.cpp
+++ b/src/amd/compiler/aco_register_allocation.cpp
@@ -64,6 +64,7 @@ struct ra_ctx {
    std::unordered_map<unsigned, phi_info> phi_map;
    std::unordered_map<unsigned, unsigned> affinities;
    std::unordered_map<unsigned, Instruction*> vectors;
+   aco_ptr<Instruction> pseudo_dummy;
    unsigned max_used_sgpr = 0;
    unsigned max_used_vgpr = 0;
    std::bitset<64> defs_done; /* see MAX_ARGS in aco_instruction_selection_setup.cpp */
@@ -73,7 +74,10 @@ struct ra_ctx {
                               renames(program->blocks.size()),
                               incomplete_phis(program->blocks.size()),
                               filled(program->blocks.size()),
-                              sealed(program->blocks.size()) {}
+                              sealed(program->blocks.size())
+   {
+      pseudo_dummy.reset(create_instruction<Instruction>(aco_opcode::p_parallelcopy, Format::PSEUDO, 0, 0));
+   }
 };
 
 class RegisterFile {
@@ -1198,7 +1202,7 @@ void get_reg_for_operand(ra_ctx& ctx, RegisterFile& register_file,
          pc_op.setFixed(operand.physReg());
 
          /* find free reg */
-         PhysReg reg = get_reg(ctx, register_file, pc_op.getTemp(), parallelcopy, instr);
+         PhysReg reg = get_reg(ctx, register_file, pc_op.getTemp(), parallelcopy, ctx.pseudo_dummy);
          Definition pc_def = Definition(PhysReg{reg}, pc_op.regClass());
          register_file.clear(pc_op);
          parallelcopy.emplace_back(pc_op, pc_def);