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https://github.com/carbon-language/carbon-lang.git
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Chandler Carruth
95fc6fae22
- Move formatted printing to `hashing.cpp` instead of `hashing.h` - Separate APInt and APFloat hashing specializations into a new `hashing_llvm.h` - Update toolchain/base dependencies and include sites that hash LLVM data types to include `hashing_llvm.h` Combined, this reduces the transitive includes caused by `hashing.h`. Assisted-by: Antigravity with Gemini
48 lines
1.6 KiB
C++
48 lines
1.6 KiB
C++
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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#ifndef CARBON_COMMON_HASHING_LLVM_H_
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#define CARBON_COMMON_HASHING_LLVM_H_
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#include "common/hashing.h"
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#include "llvm/ADT/APFloat.h"
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#include "llvm/ADT/APInt.h"
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#include "llvm/ADT/Hashing.h"
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namespace Carbon::InternalHashDispatch {
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template <>
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struct CustomHashValue<llvm::APInt> {
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static auto Hash(llvm::APInt value, uint64_t seed) -> HashCode {
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Hasher hasher(seed);
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if (LLVM_LIKELY(value.isSingleWord())) {
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hasher.Hash(value.getBitWidth(), value.getZExtValue());
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} else {
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hasher.HashRaw(value.getBitWidth());
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hasher.HashSizedBytes(
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llvm::ArrayRef(value.getRawData(), value.getNumWords()));
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}
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return static_cast<HashCode>(hasher);
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}
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};
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template <>
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struct CustomHashValue<llvm::APFloat> {
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static auto Hash(llvm::APFloat value, uint64_t seed) -> HashCode {
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Hasher hasher(seed);
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// Hashing floating point numbers is complex and depends on the specific
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// internal semantics of `APFloat`, so delegate to the LLVM hashing
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// framework here. We re-hash the result to mix in our seed. All of this is
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// a bit inefficient, and we can revisit this to provide a dedicated
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// implementation if it becomes a bottleneck.
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using llvm::hash_value;
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hasher.HashRaw(hash_value(value));
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return static_cast<HashCode>(hasher);
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}
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};
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} // namespace Carbon::InternalHashDispatch
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#endif // CARBON_COMMON_HASHING_LLVM_H_
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