dcf0160bd6
Change the "fixed encoding" table used for encoding intrinsic type signature to use 16-bit encoding as opposed to 32-bit. This results in both space and time improvements. For space, the total static storage size (in bytes) of this info reduces by 50%: - Current = 14193*4 (Fixed table) + 16058 + 3 (Long Table) = 72833 - New size = 14193*2 (Fixed table) + 19879 + 3 (Long Table) = 48268. - Reduction = 50.9% For time, with the added benchmark, we see a 7.3% speedup in `GetIntrinsicInfoTableEntries` benchmark. Actual output of the benchmark in included in the GitHub MR.
31 lines
1023 B
C++
31 lines
1023 B
C++
//===- GetIntrinsicInfoTableEntries.cpp - IIT signature benchmark ---------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "benchmark/benchmark.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/IR/Intrinsics.h"
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using namespace llvm;
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using namespace Intrinsic;
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static void BM_GetIntrinsicInfoTableEntries(benchmark::State &state) {
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SmallVector<IITDescriptor> Table;
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for (auto _ : state) {
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for (ID ID = 1; ID < num_intrinsics; ++ID) {
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// This makes sure the vector does not keep growing, as well as after the
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// first iteration does not result in additional allocations.
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Table.clear();
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getIntrinsicInfoTableEntries(ID, Table);
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}
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}
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}
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BENCHMARK(BM_GetIntrinsicInfoTableEntries);
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BENCHMARK_MAIN();
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