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4a9aef683d
Reuse the APInt::BitWidth to eliminate DynamicAPInt::HoldsLarge, cutting the size of DynamicAPInt by four bytes. This is implemented by making DynamicAPInt a friend of SlowDynamicAPInt and APInt, so it can directly access SlowDynamicAPInt::Val and APInt::BitWidth. We get a speedup of 4% with this patch.
36 lines
1.2 KiB
C++
36 lines
1.2 KiB
C++
//===- DynamicAPInt.cpp - DynamicAPInt Implementation -----------*- C++ -*-===//
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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 "llvm/ADT/DynamicAPInt.h"
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#include "llvm/ADT/Hashing.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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hash_code llvm::hash_value(const DynamicAPInt &X) {
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if (X.isSmall())
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return llvm::hash_value(X.getSmall());
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return detail::hash_value(X.getLarge());
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}
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void DynamicAPInt::static_assert_layout() {
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constexpr size_t ValLargeOffset =
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offsetof(DynamicAPInt, ValLarge.Val.BitWidth);
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constexpr size_t ValSmallOffset = offsetof(DynamicAPInt, ValSmall);
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constexpr size_t ValSmallSize = sizeof(ValSmall);
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static_assert(ValLargeOffset >= ValSmallOffset + ValSmallSize);
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}
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raw_ostream &DynamicAPInt::print(raw_ostream &OS) const {
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if (isSmall())
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return OS << ValSmall;
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return OS << ValLarge;
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}
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void DynamicAPInt::dump() const { print(dbgs()); }
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