src/panfrost/compiler/test/test-scheduler-predicates.cpp

/*
 * Copyright (C) 2021 Collabora, Ltd.
 *
 * 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 "bi_builder.h"
#include "bi_test.h"
#include "compiler.h"

#include <gtest/gtest.h>

class SchedulerPredicates : public testing::Test {
 protected:
   SchedulerPredicates()
   {
      mem_ctx = ralloc_context(NULL);
      b = bit_builder(mem_ctx);
   }
   ~SchedulerPredicates()
   {
      ralloc_free(mem_ctx);
   }

   bi_index TMP()
   {
      return bi_temp(b->shader);
   }

   void *mem_ctx;
   bi_builder *b;
};

TEST_F(SchedulerPredicates, MOV)
{
   bi_instr *mov = bi_mov_i32_to(b, TMP(), TMP());
   ASSERT_TRUE(bi_can_fma(mov));
   ASSERT_TRUE(bi_can_add(mov));
   ASSERT_FALSE(bi_must_message(mov));
   ASSERT_TRUE(bi_reads_zero(mov));
   ASSERT_TRUE(bi_reads_temps(mov, 0));
   ASSERT_TRUE(bi_reads_t(mov, 0));
}

TEST_F(SchedulerPredicates, FMA)
{
   bi_instr *fma = bi_fma_f32_to(b, TMP(), TMP(), TMP(), bi_zero());
   ASSERT_TRUE(bi_can_fma(fma));
   ASSERT_FALSE(bi_can_add(fma));
   ASSERT_FALSE(bi_must_message(fma));
   ASSERT_TRUE(bi_reads_zero(fma));
   for (unsigned i = 0; i < 3; ++i) {
      ASSERT_TRUE(bi_reads_temps(fma, i));
      ASSERT_TRUE(bi_reads_t(fma, i));
   }
}

TEST_F(SchedulerPredicates, LOAD)
{
   bi_instr *load = bi_load_i128_to(b, TMP(), TMP(), TMP(), BI_SEG_UBO, 0);
   ASSERT_FALSE(bi_can_fma(load));
   ASSERT_TRUE(bi_can_add(load));
   ASSERT_TRUE(bi_must_message(load));
   for (unsigned i = 0; i < 2; ++i) {
      ASSERT_TRUE(bi_reads_temps(load, i));
      ASSERT_TRUE(bi_reads_t(load, i));
   }
}

TEST_F(SchedulerPredicates, BLEND)
{
   bi_instr *blend = bi_blend_to(b, TMP(), TMP(), TMP(), TMP(), TMP(), TMP(),
                                 BI_REGISTER_FORMAT_F32, 4, 4);
   ASSERT_FALSE(bi_can_fma(blend));
   ASSERT_TRUE(bi_can_add(blend));
   ASSERT_TRUE(bi_must_message(blend));
   for (unsigned i = 0; i < 4; ++i)
      ASSERT_TRUE(bi_reads_temps(blend, i));
   ASSERT_FALSE(bi_reads_t(blend, 0));
   ASSERT_TRUE(bi_reads_t(blend, 1));
   ASSERT_FALSE(bi_reads_t(blend, 2));
   ASSERT_FALSE(bi_reads_t(blend, 3));
}

TEST_F(SchedulerPredicates, RestrictionsOnModifiersOfSameCycleTemporaries)
{
   bi_instr *fadd = bi_fadd_f32_to(b, TMP(), TMP(), TMP());
   ASSERT_TRUE(bi_reads_t(fadd, 0));

   for (unsigned i = 0; i < 2; ++i) {
      for (unsigned j = 0; j < 2; ++j) {
         bi_instr *fadd = bi_fadd_f32_to(b, TMP(), TMP(), TMP());
         fadd->src[i] = bi_swz_16(TMP(), j, j);
         ASSERT_TRUE(bi_reads_t(fadd, 1 - i));
         ASSERT_FALSE(bi_reads_t(fadd, i));
      }
   }
}

TEST_F(SchedulerPredicates, RestrictionsOnFAddV2F16)
{
   bi_index x = bi_register(0);
   bi_index y = bi_register(1);

   /* Basic */
   bi_instr *fadd = bi_fadd_v2f16_to(b, TMP(), x, x);

   ASSERT_TRUE(bi_can_fma(fadd));
   ASSERT_TRUE(bi_can_add(fadd));

   /* With imbalanced abs */
   fadd->src[0].abs = true;

   ASSERT_TRUE(bi_can_fma(fadd));
   ASSERT_TRUE(bi_can_add(fadd));

   /* With equal abs */
   fadd->src[1].abs = true;

   ASSERT_FALSE(bi_can_fma(fadd));
   ASSERT_TRUE(bi_can_add(fadd));

   /* With equal abs but different sources */
   fadd->src[1] = bi_abs(y);

   ASSERT_TRUE(bi_can_fma(fadd));
   ASSERT_TRUE(bi_can_add(fadd));

   /* With clamp */
   fadd->clamp = BI_CLAMP_CLAMP_M1_1;

   ASSERT_TRUE(bi_can_fma(fadd));
   ASSERT_FALSE(bi_can_add(fadd));

   /* Impossible encoding (should never be seen) */
   fadd->src[1] = fadd->src[0];

   ASSERT_FALSE(bi_can_fma(fadd));
   ASSERT_FALSE(bi_can_add(fadd));
}

TEST_F(SchedulerPredicates, BranchOffset)
{
   bi_instr *jump = bi_jump(b, TMP());
   ASSERT_FALSE(bi_reads_t(jump, 0));
}