mesa/src/amd/compiler/tests/test_regalloc.cpp

/*
 * Copyright © 2020 Valve Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 *
 */
#include "helpers.h"

using namespace aco;

BEGIN_TEST(regalloc.subdword_alloc.reuse_16bit_operands)
   /* Registers of operands should be "recycled" for the output. But if the
    * input is smaller than the output, that's not generally possible. The
    * first v_cvt_f32_f16 instruction below uses the upper 16 bits of v0
    * while the lower 16 bits are still live, so the output must be stored in
    * a register other than v0. For the second v_cvt_f32_f16, the original
    * value stored in v0 is no longer used and hence it's safe to store the
    * result in v0.
    */

   /* TODO: is this possible to do on GFX11? */
   for (amd_gfx_level cc = GFX8; cc <= GFX10_3; cc = (amd_gfx_level)((unsigned)cc + 1)) {
      for (bool pessimistic : { false, true }) {
         const char* subvariant = pessimistic ? "/pessimistic" : "/optimistic";

         //>> v1: %_:v[#a] = p_startpgm
         if (!setup_cs("v1", (amd_gfx_level)cc, CHIP_UNKNOWN, subvariant))
            return;

         //! v2b: %_:v[#a][0:16], v2b: %res1:v[#a][16:32] = p_split_vector %_:v[#a]
         Builder::Result tmp = bld.pseudo(aco_opcode::p_split_vector, bld.def(v2b), bld.def(v2b), inputs[0]);

         //! v1: %_:v[#b] = v_cvt_f32_f16 %_:v[#a][16:32] dst_sel:dword src0_sel:uword1
         //! v1: %_:v[#a] = v_cvt_f32_f16 %_:v[#a][0:16]
         //; success = (b != a)
         auto result1 = bld.vop1(aco_opcode::v_cvt_f32_f16, bld.def(v1), tmp.def(1).getTemp());
         auto result2 = bld.vop1(aco_opcode::v_cvt_f32_f16, bld.def(v1), tmp.def(0).getTemp());
         writeout(0, result1);
         writeout(1, result2);

         finish_ra_test(ra_test_policy { pessimistic });
      }
   }
END_TEST

BEGIN_TEST(regalloc.32bit_partial_write)
   //>> v1: %_:v[0] = p_startpgm
   if (!setup_cs("v1", GFX10))
      return;

   /* ensure high 16 bits are occupied */
   //! v2b: %_:v[0][0:16], v2b: %_:v[0][16:32] = p_split_vector %_:v[0]
   Temp hi = bld.pseudo(aco_opcode::p_split_vector, bld.def(v2b), bld.def(v2b), inputs[0]).def(1).getTemp();

   /* This test checks if this instruction uses SDWA. */
   //! v2b: %_:v[0][0:16] = v_not_b32 0 dst_sel:uword0 dst_preserve src0_sel:dword
   Temp lo = bld.vop1(aco_opcode::v_not_b32, bld.def(v2b), Operand::zero());

   //! v1: %_:v[0] = p_create_vector %_:v[0][0:16], %_:v[0][16:32]
   bld.pseudo(aco_opcode::p_create_vector, bld.def(v1), lo, hi);

   finish_ra_test(ra_test_policy());
END_TEST

BEGIN_TEST(regalloc.precolor.swap)
   //>> s2: %op0:s[0-1] = p_startpgm
   if (!setup_cs("s2", GFX10))
      return;

   program->dev.sgpr_limit = 4;

   //! s2: %op1:s[2-3] = p_unit_test
   Temp op1 = bld.pseudo(aco_opcode::p_unit_test, bld.def(s2));

   //! s2: %op1_2:s[0-1], s2: %op0_2:s[2-3] = p_parallelcopy %op1:s[2-3], %op0:s[0-1]
   //! p_unit_test %op0_2:s[2-3], %op1_2:s[0-1]
   Operand op(inputs[0]);
   op.setFixed(PhysReg(2));
   bld.pseudo(aco_opcode::p_unit_test, op, op1);

   finish_ra_test(ra_test_policy());
END_TEST

BEGIN_TEST(regalloc.precolor.blocking_vector)
   //>> s2: %tmp0:s[0-1], s1: %tmp1:s[2] = p_startpgm
   if (!setup_cs("s2 s1", GFX10))
      return;

   //! s2: %tmp0_2:s[2-3], s1: %tmp1_2:s[1] = p_parallelcopy %tmp0:s[0-1], %tmp1:s[2]
   //! p_unit_test %tmp1_2:s[1]
   Operand op(inputs[1]);
   op.setFixed(PhysReg(1));
   bld.pseudo(aco_opcode::p_unit_test, op);

   //! p_unit_test %tmp0_2:s[2-3]
   bld.pseudo(aco_opcode::p_unit_test, inputs[0]);

   finish_ra_test(ra_test_policy());
END_TEST

BEGIN_TEST(regalloc.precolor.vector.test)
   //>> s2: %tmp0:s[0-1], s1: %tmp1:s[2], s1: %tmp2:s[3] = p_startpgm
   if (!setup_cs("s2 s1 s1", GFX10))
      return;

   //! s1: %tmp2_2:s[0], s2: %tmp0_2:s[2-3] = p_parallelcopy %tmp2:s[3], %tmp0:s[0-1]
   //! p_unit_test %tmp0_2:s[2-3]
   Operand op(inputs[0]);
   op.setFixed(PhysReg(2));
   bld.pseudo(aco_opcode::p_unit_test, op);

   //! p_unit_test %tmp2_2:s[0]
   bld.pseudo(aco_opcode::p_unit_test, inputs[2]);

   finish_ra_test(ra_test_policy());
END_TEST

BEGIN_TEST(regalloc.precolor.vector.collect)
   //>> s2: %tmp0:s[0-1], s1: %tmp1:s[2], s1: %tmp2:s[3] = p_startpgm
   if (!setup_cs("s2 s1 s1", GFX10))
      return;

   //! s1: %tmp1_2:s[0], s1: %tmp2_2:s[1], s2: %tmp0_2:s[2-3] = p_parallelcopy %tmp1:s[2], %tmp2:s[3], %tmp0:s[0-1]
   //! p_unit_test %tmp0_2:s[2-3]
   Operand op(inputs[0]);
   op.setFixed(PhysReg(2));
   bld.pseudo(aco_opcode::p_unit_test, op);

   //! p_unit_test %tmp1_2:s[0], %tmp2_2:s[1]
   bld.pseudo(aco_opcode::p_unit_test, inputs[1], inputs[2]);

   finish_ra_test(ra_test_policy());
END_TEST

BEGIN_TEST(regalloc.precolor.vgpr_move)
   //>> v1: %tmp0:v[0], v1: %tmp1:v[1] = p_startpgm
   if (!setup_cs("v1 v1", GFX10))
      return;

   //! v1: %tmp0_2:v[1], v1: %tmp1_2:v[0] = p_parallelcopy %tmp0:v[0], %tmp1:v[1]
   //! p_unit_test %tmp0_2:v[1], %tmp1_2:v[0]
   bld.pseudo(aco_opcode::p_unit_test, inputs[0], Operand(inputs[1], PhysReg(256)));

   finish_ra_test(ra_test_policy());
END_TEST

BEGIN_TEST(regalloc.scratch_sgpr.create_vector)
   if (!setup_cs("v1 s1", GFX7))
      return;

   Temp tmp = bld.pseudo(aco_opcode::p_extract_vector, bld.def(v1b), inputs[0], Operand::zero());

   //>> v3b: %0:v[0][0:24] = v_and_b32 0xffffff, %0:v[0][0:24]
   //! s1: %0:s[1] = s_mov_b32 0x1000001
   //! v1: %0:v[0] = v_mul_lo_u32 %0:s[1], %_:v[0][0:8]
   bld.pseudo(aco_opcode::p_create_vector, bld.def(v1), Operand(v3b), Operand(tmp));

   //! p_unit_test %_:s[0]
   //! s_endpgm
   bld.pseudo(aco_opcode::p_unit_test, inputs[1]);

   finish_ra_test(ra_test_policy(), true);
END_TEST

BEGIN_TEST(regalloc.scratch_sgpr.create_vector_sgpr_operand)
   if (!setup_cs("v2 s1", GFX7))
      return;

   Temp tmp = bld.pseudo(aco_opcode::p_extract_vector, bld.def(v1b), inputs[0], Operand::c32(4u));

   //>> v1: %0:v[0] = v_mov_b32 %_:s[0]
   //! v3b: %0:v[1][0:24] = v_and_b32 0xffffff, %0:v[1][0:24]
   //! s1: %0:s[1] = s_mov_b32 0x1000001
   //! v1: %0:v[1] = v_mul_lo_u32 %0:s[1], %_:v[1][0:8]
   bld.pseudo(aco_opcode::p_create_vector, bld.def(v2), inputs[1], Operand(v3b), Operand(tmp));

   //! p_unit_test %_:s[0]
   //! s_endpgm
   bld.pseudo(aco_opcode::p_unit_test, inputs[1]);

   finish_ra_test(ra_test_policy(), true);
END_TEST

BEGIN_TEST(regalloc.linear_vgpr.live_range_split.fixed_def)
   //>> p_startpgm
   if (!setup_cs("", GFX10))
      return;

   PhysReg reg_v0{256};

   //! lv1: %tmp1:v[0] = p_unit_test
   Temp tmp = bld.pseudo(aco_opcode::p_unit_test, bld.def(v1.as_linear(), reg_v0));

   //! lv1: %tmp2:v[1] = p_parallelcopy %tmp1:v[0]
   //! v1: %_:v[0] = p_unit_test
   bld.pseudo(aco_opcode::p_unit_test, Definition(reg_v0, v1));

   //! p_unit_test %tmp2:v[1]
   bld.pseudo(aco_opcode::p_unit_test, tmp);

   finish_ra_test(ra_test_policy());
END_TEST

BEGIN_TEST(regalloc.linear_vgpr.live_range_split.get_reg_impl)
   //>> p_startpgm
   if (!setup_cs("", GFX10))
      return;

   program->dev.vgpr_limit = 3;

   PhysReg reg_v1{257};

   //! s1: %scc_tmp:scc, s1: %1:s[0] = p_unit_test
   Temp s0_tmp = bld.tmp(s1);
   Temp scc_tmp = bld.pseudo(aco_opcode::p_unit_test, bld.def(s1, scc), Definition(s0_tmp.id(), PhysReg{0}, s1));

   //! lv1: %tmp1:v[1] = p_unit_test
   Temp tmp = bld.pseudo(aco_opcode::p_unit_test, bld.def(v1.as_linear(), reg_v1));

   //! lv1: %tmp2:v[2] = p_parallelcopy %tmp1:v[1]
   //! v2: %_:v[0-1] = p_unit_test
   bld.pseudo(aco_opcode::p_unit_test, bld.def(v2));

   //! p_unit_test %tmp2:v[2], %scc_tmp:scc, %1:s[0]
   bld.pseudo(aco_opcode::p_unit_test, tmp, scc_tmp, s0_tmp);

   finish_ra_test(ra_test_policy());

   //>> lv1: %5:v[2] = p_parallelcopy %3:v[1] scc:1 scratch:s1
   Pseudo_instruction& parallelcopy = program->blocks[0].instructions[3]->pseudo();
   aco_print_instr(&parallelcopy, output);
   fprintf(output, " scc:%u scratch:s%u\n", parallelcopy.tmp_in_scc, parallelcopy.scratch_sgpr.reg());
END_TEST

BEGIN_TEST(regalloc.linear_vgpr.live_range_split.get_regs_for_copies)
   //>> p_startpgm
   if (!setup_cs("", GFX10))
      return;

   program->dev.vgpr_limit = 6;

   PhysReg reg_v2{258};
   PhysReg reg_v4{260};

   //! lv1: %lin_tmp1:v[4] = p_unit_test
   Temp lin_tmp = bld.pseudo(aco_opcode::p_unit_test, bld.def(v1.as_linear(), reg_v4));
   //! v2: %log_tmp1:v[2-3] = p_unit_test
   Temp log_tmp = bld.pseudo(aco_opcode::p_unit_test, bld.def(v2, reg_v2));

   //! lv1: %lin_tmp2:v[0], v2: %log_tmp2:v[4-5] = p_parallelcopy %lin_tmp1:v[4], %log_tmp1:v[2-3]
   //! v3: %_:v[1-3] = p_unit_test
   bld.pseudo(aco_opcode::p_unit_test, bld.def(v3));

   //! p_unit_test %log_tmp2:v[4-5], %lin_tmp2:v[0]
   bld.pseudo(aco_opcode::p_unit_test, log_tmp, lin_tmp);

   finish_ra_test(ra_test_policy());
END_TEST

BEGIN_TEST(regalloc.linear_vgpr.live_range_split.get_reg_create_vector)
   //>> p_startpgm
   if (!setup_cs("", GFX10))
      return;

   program->dev.vgpr_limit = 4;

   PhysReg reg_v0{256};
   PhysReg reg_v1{257};

   //! lv1: %lin_tmp1:v[0] = p_unit_test
   Temp lin_tmp = bld.pseudo(aco_opcode::p_unit_test, bld.def(v1.as_linear(), reg_v0));
   //! v1: %log_tmp:v[1] = p_unit_test
   Temp log_tmp = bld.pseudo(aco_opcode::p_unit_test, bld.def(v1, reg_v1));

   //! lv1: %lin_tmp2:v[2] = p_parallelcopy %lin_tmp1:v[0]
   //! v2: %_:v[0-1] = p_create_vector v1: undef, %log_tmp:v[1]
   bld.pseudo(aco_opcode::p_create_vector, bld.def(v2), Operand(v1), log_tmp);

   //! p_unit_test %lin_tmp2:v[2]
   bld.pseudo(aco_opcode::p_unit_test, lin_tmp);

   finish_ra_test(ra_test_policy());
END_TEST

BEGIN_TEST(regalloc.branch_def_phis_at_merge_block)
   //>> p_startpgm
   if (!setup_cs("", GFX10))
      return;

   //! s2: %_:s[2-3] = p_branch
   bld.branch(aco_opcode::p_branch, bld.def(s2));

   //! BB1
   //! /* logical preds: / linear preds: BB0, / kind: uniform, */
   bld.reset(program->create_and_insert_block());
   program->blocks[1].linear_preds.push_back(0);

   //! s2: %tmp:s[0-1] = p_linear_phi 0
   Temp tmp = bld.pseudo(aco_opcode::p_linear_phi, bld.def(s2), Operand::c64(0u));

   //! p_unit_test %tmp:s[0-1]
   bld.pseudo(aco_opcode::p_unit_test, tmp);

   finish_ra_test(ra_test_policy());
END_TEST

BEGIN_TEST(regalloc.branch_def_phis_at_branch_block)
   //>> p_startpgm
   if (!setup_cs("", GFX10))
      return;

   //! s2: %tmp:s[0-1] = p_unit_test
   Temp tmp = bld.pseudo(aco_opcode::p_unit_test, bld.def(s2));

   //! s2: %_:s[2-3] = p_cbranch_z %0:scc
   bld.branch(aco_opcode::p_cbranch_z, bld.def(s2), Operand(scc, s1));

   //! BB1
   //! /* logical preds: / linear preds: BB0, / kind: */
   bld.reset(program->create_and_insert_block());
   program->blocks[1].linear_preds.push_back(0);

   //! p_unit_test %tmp:s[0-1]
   bld.pseudo(aco_opcode::p_unit_test, tmp);
   bld.branch(aco_opcode::p_branch, bld.def(s2));

   bld.reset(program->create_and_insert_block());
   program->blocks[2].linear_preds.push_back(0);

   bld.branch(aco_opcode::p_branch, bld.def(s2));

   bld.reset(program->create_and_insert_block());
   program->blocks[3].linear_preds.push_back(1);
   program->blocks[3].linear_preds.push_back(2);

   finish_ra_test(ra_test_policy());
END_TEST