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- Currently, the host cpu information is not easily available on z/OS as in other platforms. - This information is stored in the Communications Vector Table (https://www.ibm.com/docs/en/zos/2.2.0?topic=information-cvt-mapping) Reviewed By: uweigand Differential Revision: https://reviews.llvm.org/D102793
54 lines
1.8 KiB
C++
54 lines
1.8 KiB
C++
//===- llvm/Support/BCD.h - Binary-Coded Decimal utility functions -*- 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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//
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// This file declares some utility functions for encoding/decoding BCD values.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SUPPORT_BCD_H
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#define LLVM_SUPPORT_BCD_H
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#include <assert.h>
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#include <cstddef>
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#include <cstdint>
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namespace llvm {
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// Decode a packed BCD value.
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// Maximum value of int64_t is 9,223,372,036,854,775,807. These are 18 usable
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// decimal digits. Thus BCD numbers of up to 9 bytes can be converted.
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// Please note that s390 supports BCD numbers up to a length of 16 bytes.
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inline int64_t decodePackedBCD(const uint8_t *Ptr, size_t ByteLen,
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bool IsSigned = true) {
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assert(ByteLen >= 1 && ByteLen <= 9 && "Invalid BCD number");
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int64_t Value = 0;
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size_t RunLen = ByteLen - static_cast<unsigned>(IsSigned);
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for (size_t I = 0; I < RunLen; ++I) {
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uint8_t DecodedByteValue = ((Ptr[I] >> 4) & 0x0f) * 10 + (Ptr[I] & 0x0f);
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Value = (Value * 100) + DecodedByteValue;
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}
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if (IsSigned) {
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uint8_t DecodedByteValue = (Ptr[ByteLen - 1] >> 4) & 0x0f;
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uint8_t Sign = Ptr[ByteLen - 1] & 0x0f;
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Value = (Value * 10) + DecodedByteValue;
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if (Sign == 0x0d || Sign == 0x0b)
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Value *= -1;
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}
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return Value;
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}
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template <typename ResultT, typename ValT>
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inline ResultT decodePackedBCD(const ValT Val, bool IsSigned = true) {
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return static_cast<ResultT>(decodePackedBCD(
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reinterpret_cast<const uint8_t *>(&Val), sizeof(ValT), IsSigned));
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}
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} // namespace llvm
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#endif // LLVM_SUPPORT_BCD_H
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