diff options
Diffstat (limited to 'deps/v8/src/codegen/reglist.h')
-rw-r--r-- | deps/v8/src/codegen/reglist.h | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/deps/v8/src/codegen/reglist.h b/deps/v8/src/codegen/reglist.h new file mode 100644 index 0000000000..609e6b8845 --- /dev/null +++ b/deps/v8/src/codegen/reglist.h @@ -0,0 +1,47 @@ +// Copyright 2017 the V8 project authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. + +#ifndef V8_CODEGEN_REGLIST_H_ +#define V8_CODEGEN_REGLIST_H_ + +#include <cstdint> + +#include "src/base/bits.h" +#include "src/base/template-utils.h" + +namespace v8 { +namespace internal { + +// Register configurations. +#if V8_TARGET_ARCH_ARM64 +using RegList = uint64_t; +#else +using RegList = uint32_t; +#endif + +// Get the number of registers in a given register list. +constexpr int NumRegs(RegList list) { + return base::bits::CountPopulation(list); +} + +// Combine two RegLists by building the union of the contained registers. +// Implemented as a Functor to pass it to base::fold even on gcc < 5 (see +// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52892). +// TODO(clemensh): Remove this once we require gcc >= 5.0. +struct CombineRegListsFunctor { + constexpr RegList operator()(RegList list1, RegList list2) const { + return list1 | list2; + } +}; + +// Combine several RegLists by building the union of the contained registers. +template <typename... RegLists> +constexpr RegList CombineRegLists(RegLists... lists) { + return base::fold(CombineRegListsFunctor{}, 0, lists...); +} + +} // namespace internal +} // namespace v8 + +#endif // V8_CODEGEN_REGLIST_H_ |