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// 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. #include <cstdint> #include "include/v8config.h" #include "src/base/macros.h" namespace v8 { namespace internal { // ISA constants. -------------------------------------------------------------- // The following code initializes float/double variables with bit patterns // without using static initializers (which is surprisingly difficult in // C++). These variables are used by client code as extern float16, // extern float and extern double types, which works because (I think) the // linker ignores the types. This is kept in a separate source file to // avoid breaking jumbo builds. // // TODO(mostynb): replace these with std::numeric_limits constexpr's where // possible, and figure out how to replace *DefaultNaN with something clean, // then move this code back into instructions-arm64.cc with the same types // that client code uses. #if defined(V8_OS_WIN) extern "C" { #endif extern const uint16_t kFP16PositiveInfinity = 0x7C00; extern const uint16_t kFP16NegativeInfinity = 0xFC00; V8_EXPORT_PRIVATE extern const uint32_t kFP32PositiveInfinity = 0x7F800000; V8_EXPORT_PRIVATE extern const uint32_t kFP32NegativeInfinity = 0xFF800000; V8_EXPORT_PRIVATE extern const uint64_t kFP64PositiveInfinity = 0x7FF0000000000000UL; V8_EXPORT_PRIVATE extern const uint64_t kFP64NegativeInfinity = 0xFFF0000000000000UL; // This value is a signalling NaN as both a double and as a float (taking the // least-significant word). V8_EXPORT_PRIVATE extern const uint64_t kFP64SignallingNaN = 0x7FF000007F800001; V8_EXPORT_PRIVATE extern const uint32_t kFP32SignallingNaN = 0x7F800001; // A similar value, but as a quiet NaN. V8_EXPORT_PRIVATE extern const uint64_t kFP64QuietNaN = 0x7FF800007FC00001; V8_EXPORT_PRIVATE extern const uint32_t kFP32QuietNaN = 0x7FC00001; // The default NaN values (for FPCR.DN=1). V8_EXPORT_PRIVATE extern const uint64_t kFP64DefaultNaN = 0x7FF8000000000000UL; V8_EXPORT_PRIVATE extern const uint32_t kFP32DefaultNaN = 0x7FC00000; extern const uint16_t kFP16DefaultNaN = 0x7E00; #if defined(V8_OS_WIN) } // end of extern "C" #endif } // namespace internal } // namespace v8