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// Copyright 2020 Google LLC
// SPDX-License-Identifier: Apache-2.0
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "hwy/targets.h"
#include "hwy/tests/test_util-inl.h"
namespace fake {
#define DECLARE_FUNCTION(TGT) \
namespace N_##TGT { \
/* Function argument is just to ensure/demonstrate they are possible. */ \
int64_t FakeFunction(int) { return HWY_##TGT; } \
}
DECLARE_FUNCTION(AVX3_DL)
DECLARE_FUNCTION(AVX3)
DECLARE_FUNCTION(AVX2)
DECLARE_FUNCTION(SSE4)
DECLARE_FUNCTION(SSSE3)
DECLARE_FUNCTION(NEON)
DECLARE_FUNCTION(SVE)
DECLARE_FUNCTION(SVE2)
DECLARE_FUNCTION(SVE_256)
DECLARE_FUNCTION(SVE2_128)
DECLARE_FUNCTION(PPC8)
DECLARE_FUNCTION(WASM)
DECLARE_FUNCTION(WASM_EMU256)
DECLARE_FUNCTION(RVV)
DECLARE_FUNCTION(SCALAR)
DECLARE_FUNCTION(EMU128)
HWY_EXPORT(FakeFunction);
void CallFunctionForTarget(int64_t target, int line) {
if ((HWY_TARGETS & target) == 0) return;
hwy::SetSupportedTargetsForTest(target);
// Call Update() first to make &HWY_DYNAMIC_DISPATCH() return
// the pointer to the already cached function.
hwy::GetChosenTarget().Update(hwy::SupportedTargets());
EXPECT_EQ(target, HWY_DYNAMIC_DISPATCH(FakeFunction)(42)) << line;
// Calling DeInit() will test that the initializer function
// also calls the right function.
hwy::GetChosenTarget().DeInit();
#if HWY_DISPATCH_WORKAROUND
EXPECT_EQ(HWY_STATIC_TARGET, HWY_DYNAMIC_DISPATCH(FakeFunction)(42)) << line;
#else
EXPECT_EQ(target, HWY_DYNAMIC_DISPATCH(FakeFunction)(42)) << line;
#endif
// Second call uses the cached value from the previous call.
EXPECT_EQ(target, HWY_DYNAMIC_DISPATCH(FakeFunction)(42)) << line;
}
void CheckFakeFunction() {
// When adding a target, also add to DECLARE_FUNCTION above.
CallFunctionForTarget(HWY_AVX3_DL, __LINE__);
CallFunctionForTarget(HWY_AVX3, __LINE__);
CallFunctionForTarget(HWY_AVX2, __LINE__);
CallFunctionForTarget(HWY_SSE4, __LINE__);
CallFunctionForTarget(HWY_SSSE3, __LINE__);
CallFunctionForTarget(HWY_NEON, __LINE__);
CallFunctionForTarget(HWY_SVE, __LINE__);
CallFunctionForTarget(HWY_SVE2, __LINE__);
CallFunctionForTarget(HWY_SVE_256, __LINE__);
CallFunctionForTarget(HWY_SVE2_128, __LINE__);
CallFunctionForTarget(HWY_PPC8, __LINE__);
CallFunctionForTarget(HWY_WASM, __LINE__);
CallFunctionForTarget(HWY_WASM_EMU256, __LINE__);
CallFunctionForTarget(HWY_RVV, __LINE__);
// The tables only have space for either HWY_SCALAR or HWY_EMU128; the former
// is opt-in only.
#if defined(HWY_COMPILE_ONLY_SCALAR) || HWY_BROKEN_EMU128
CallFunctionForTarget(HWY_SCALAR, __LINE__);
#else
CallFunctionForTarget(HWY_EMU128, __LINE__);
#endif
}
} // namespace fake
namespace hwy {
class HwyTargetsTest : public testing::Test {
protected:
void TearDown() override {
SetSupportedTargetsForTest(0);
DisableTargets(0); // Reset the mask.
}
};
// Test that the order in the HWY_EXPORT static array matches the expected
// value of the target bits. This is only checked for the targets that are
// enabled in the current compilation.
TEST_F(HwyTargetsTest, ChosenTargetOrderTest) { fake::CheckFakeFunction(); }
TEST_F(HwyTargetsTest, DisabledTargetsTest) {
DisableTargets(~0LL);
// Check that disabling everything at least leaves the static target.
HWY_ASSERT(HWY_STATIC_TARGET == SupportedTargets());
DisableTargets(0); // Reset the mask.
const int64_t current_targets = SupportedTargets();
const int64_t enabled_baseline = static_cast<int64_t>(HWY_ENABLED_BASELINE);
// Exclude these two because they are always returned by SupportedTargets.
const int64_t fallback = HWY_SCALAR | HWY_EMU128;
if ((current_targets & ~enabled_baseline & ~fallback) == 0) {
// We can't test anything else if the only compiled target is the baseline.
return;
}
// Get the lowest bit in the mask (the best target) and disable that one.
const int64_t best_target = current_targets & (~current_targets + 1);
DisableTargets(best_target);
// Check that the other targets are still enabled.
HWY_ASSERT((best_target ^ current_targets) == SupportedTargets());
DisableTargets(0); // Reset the mask.
}
} // namespace hwy
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