24a51e1eee
R=sigurds@chromium.org Bug: v8:9247 Change-Id: I25743f048e3e6cd22a18e003e77c8b78f147b630 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1630680 Reviewed-by: Sigurd Schneider <sigurds@chromium.org> Commit-Queue: Yang Guo <yangguo@chromium.org> Cr-Commit-Position: refs/heads/master@{#61836}
164 lines
7.5 KiB
C++
164 lines
7.5 KiB
C++
// Copyright 2016 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "src/codegen/register-configuration.h"
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#include "testing/gtest-support.h"
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namespace v8 {
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namespace internal {
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const MachineRepresentation kFloat32 = MachineRepresentation::kFloat32;
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const MachineRepresentation kFloat64 = MachineRepresentation::kFloat64;
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const MachineRepresentation kSimd128 = MachineRepresentation::kSimd128;
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class RegisterConfigurationUnitTest : public ::testing::Test {
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public:
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RegisterConfigurationUnitTest() = default;
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~RegisterConfigurationUnitTest() override = default;
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};
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TEST_F(RegisterConfigurationUnitTest, BasicProperties) {
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const int kNumGeneralRegs = 3;
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const int kNumDoubleRegs = 4;
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const int kNumAllocatableGeneralRegs = 2;
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const int kNumAllocatableDoubleRegs = 2;
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int general_codes[kNumAllocatableGeneralRegs] = {1, 2};
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int double_codes[kNumAllocatableDoubleRegs] = {2, 3};
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RegisterConfiguration test(kNumGeneralRegs, kNumDoubleRegs,
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kNumAllocatableGeneralRegs,
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kNumAllocatableDoubleRegs, general_codes,
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double_codes, RegisterConfiguration::OVERLAP);
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EXPECT_EQ(test.num_general_registers(), kNumGeneralRegs);
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EXPECT_EQ(test.num_double_registers(), kNumDoubleRegs);
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EXPECT_EQ(test.num_allocatable_general_registers(),
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kNumAllocatableGeneralRegs);
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EXPECT_EQ(test.num_allocatable_double_registers(), kNumAllocatableDoubleRegs);
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EXPECT_EQ(test.num_allocatable_float_registers(), kNumAllocatableDoubleRegs);
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EXPECT_EQ(test.num_allocatable_simd128_registers(),
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kNumAllocatableDoubleRegs);
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EXPECT_EQ(test.allocatable_general_codes_mask(),
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(1 << general_codes[0]) | (1 << general_codes[1]));
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EXPECT_EQ(test.GetAllocatableGeneralCode(0), general_codes[0]);
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EXPECT_EQ(test.GetAllocatableGeneralCode(1), general_codes[1]);
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EXPECT_EQ(test.allocatable_double_codes_mask(),
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(1 << double_codes[0]) | (1 << double_codes[1]));
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EXPECT_EQ(test.GetAllocatableFloatCode(0), double_codes[0]);
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EXPECT_EQ(test.GetAllocatableDoubleCode(0), double_codes[0]);
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EXPECT_EQ(test.GetAllocatableSimd128Code(0), double_codes[0]);
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EXPECT_EQ(test.GetAllocatableFloatCode(1), double_codes[1]);
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EXPECT_EQ(test.GetAllocatableDoubleCode(1), double_codes[1]);
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EXPECT_EQ(test.GetAllocatableSimd128Code(1), double_codes[1]);
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}
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TEST_F(RegisterConfigurationUnitTest, CombineAliasing) {
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const int kNumGeneralRegs = 3;
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const int kNumDoubleRegs = 4;
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const int kNumAllocatableGeneralRegs = 2;
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const int kNumAllocatableDoubleRegs = 3;
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int general_codes[] = {1, 2};
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int double_codes[] = {2, 3, 16}; // reg 16 should not alias registers 32, 33.
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RegisterConfiguration test(kNumGeneralRegs, kNumDoubleRegs,
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kNumAllocatableGeneralRegs,
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kNumAllocatableDoubleRegs, general_codes,
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double_codes, RegisterConfiguration::COMBINE);
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// There are 3 allocatable double regs, but only 2 can alias float regs.
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EXPECT_EQ(test.num_allocatable_float_registers(), 4);
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// Test that float registers combine in pairs to form double registers.
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EXPECT_EQ(test.GetAllocatableFloatCode(0), double_codes[0] * 2);
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EXPECT_EQ(test.GetAllocatableFloatCode(1), double_codes[0] * 2 + 1);
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EXPECT_EQ(test.GetAllocatableFloatCode(2), double_codes[1] * 2);
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EXPECT_EQ(test.GetAllocatableFloatCode(3), double_codes[1] * 2 + 1);
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// There are 3 allocatable double regs, but only 2 pair to form 1 SIMD reg.
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EXPECT_EQ(test.num_allocatable_simd128_registers(), 1);
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// Test that even-odd pairs of double regs combine to form a SIMD reg.
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EXPECT_EQ(test.GetAllocatableSimd128Code(0), double_codes[0] / 2);
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// Registers alias themselves.
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EXPECT_TRUE(test.AreAliases(kFloat32, 0, kFloat32, 0));
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EXPECT_TRUE(test.AreAliases(kFloat64, 0, kFloat64, 0));
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EXPECT_TRUE(test.AreAliases(kSimd128, 0, kSimd128, 0));
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// Registers don't alias other registers of the same size.
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EXPECT_FALSE(test.AreAliases(kFloat32, 1, kFloat32, 0));
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EXPECT_FALSE(test.AreAliases(kFloat64, 1, kFloat64, 0));
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EXPECT_FALSE(test.AreAliases(kSimd128, 1, kSimd128, 0));
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// Float registers combine in pairs to alias a double with index / 2, and
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// in 4's to alias a simd128 with index / 4.
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EXPECT_TRUE(test.AreAliases(kFloat32, 0, kFloat64, 0));
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EXPECT_TRUE(test.AreAliases(kFloat32, 1, kFloat64, 0));
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EXPECT_TRUE(test.AreAliases(kFloat32, 0, kSimd128, 0));
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EXPECT_TRUE(test.AreAliases(kFloat32, 1, kSimd128, 0));
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EXPECT_TRUE(test.AreAliases(kFloat32, 2, kSimd128, 0));
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EXPECT_TRUE(test.AreAliases(kFloat32, 3, kSimd128, 0));
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EXPECT_TRUE(test.AreAliases(kFloat64, 0, kFloat32, 0));
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EXPECT_TRUE(test.AreAliases(kFloat64, 0, kFloat32, 1));
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EXPECT_TRUE(test.AreAliases(kSimd128, 0, kFloat32, 0));
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EXPECT_TRUE(test.AreAliases(kSimd128, 0, kFloat32, 1));
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EXPECT_TRUE(test.AreAliases(kSimd128, 0, kFloat32, 2));
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EXPECT_TRUE(test.AreAliases(kSimd128, 0, kFloat32, 3));
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EXPECT_FALSE(test.AreAliases(kFloat32, 0, kFloat64, 1));
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EXPECT_FALSE(test.AreAliases(kFloat32, 1, kFloat64, 1));
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EXPECT_FALSE(test.AreAliases(kFloat32, 0, kSimd128, 1));
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EXPECT_FALSE(test.AreAliases(kFloat32, 1, kSimd128, 1));
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EXPECT_FALSE(test.AreAliases(kFloat64, 0, kSimd128, 1));
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EXPECT_FALSE(test.AreAliases(kFloat64, 1, kSimd128, 1));
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EXPECT_TRUE(test.AreAliases(kFloat64, 0, kFloat32, 1));
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EXPECT_TRUE(test.AreAliases(kFloat64, 1, kFloat32, 2));
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EXPECT_TRUE(test.AreAliases(kFloat64, 1, kFloat32, 3));
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EXPECT_TRUE(test.AreAliases(kFloat64, 2, kFloat32, 4));
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EXPECT_TRUE(test.AreAliases(kFloat64, 2, kFloat32, 5));
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EXPECT_TRUE(test.AreAliases(kSimd128, 0, kFloat64, 1));
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EXPECT_TRUE(test.AreAliases(kSimd128, 1, kFloat64, 2));
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EXPECT_TRUE(test.AreAliases(kSimd128, 1, kFloat64, 3));
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EXPECT_TRUE(test.AreAliases(kSimd128, 2, kFloat64, 4));
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EXPECT_TRUE(test.AreAliases(kSimd128, 2, kFloat64, 5));
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int alias_base_index = -1;
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EXPECT_EQ(test.GetAliases(kFloat32, 0, kFloat32, &alias_base_index), 1);
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EXPECT_EQ(alias_base_index, 0);
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EXPECT_EQ(test.GetAliases(kFloat64, 1, kFloat64, &alias_base_index), 1);
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EXPECT_EQ(alias_base_index, 1);
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EXPECT_EQ(test.GetAliases(kFloat32, 0, kFloat64, &alias_base_index), 1);
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EXPECT_EQ(alias_base_index, 0);
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EXPECT_EQ(test.GetAliases(kFloat32, 1, kFloat64, &alias_base_index), 1);
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EXPECT_EQ(test.GetAliases(kFloat32, 2, kFloat64, &alias_base_index), 1);
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EXPECT_EQ(alias_base_index, 1);
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EXPECT_EQ(test.GetAliases(kFloat32, 3, kFloat64, &alias_base_index), 1);
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EXPECT_EQ(alias_base_index, 1);
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EXPECT_EQ(test.GetAliases(kFloat64, 0, kFloat32, &alias_base_index), 2);
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EXPECT_EQ(alias_base_index, 0);
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EXPECT_EQ(test.GetAliases(kFloat64, 1, kFloat32, &alias_base_index), 2);
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EXPECT_EQ(alias_base_index, 2);
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// Non-allocatable codes still alias.
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EXPECT_EQ(test.GetAliases(kFloat64, 2, kFloat32, &alias_base_index), 2);
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EXPECT_EQ(alias_base_index, 4);
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// High numbered double and simd regs don't alias nonexistent float registers.
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EXPECT_EQ(
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test.GetAliases(kFloat64, RegisterConfiguration::kMaxFPRegisters / 2,
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kFloat32, &alias_base_index),
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0);
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EXPECT_EQ(
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test.GetAliases(kFloat64, RegisterConfiguration::kMaxFPRegisters / 2 + 1,
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kFloat32, &alias_base_index),
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0);
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EXPECT_EQ(
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test.GetAliases(kFloat64, RegisterConfiguration::kMaxFPRegisters - 1,
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kFloat32, &alias_base_index),
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0);
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}
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} // namespace internal
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} // namespace v8
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