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Add ULong{Add,Mult} from coreclr

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The source is under MIT license
This commit is contained in:
Michał Janiszewski 2019-03-16 22:06:24 +01:00 • committed by Michał Janiszewski
commit 920afddcfa
1 changed files with 66 additions and 0 deletions
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66
src/CalcManager/Ratpack/conv.cpp
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@ -33,6 +33,72 @@ int32_t g_ratio; // int(log(2L^BASEXPWR)/log(radix))
// Default decimal separator
wchar_t g_decimalSeparator = L'.';
#if defined(MIDL_PASS) || defined(RC_INVOKED) || defined(_M_CEE_PURE) \
|| defined(_M_AMD64) || defined(__ARM_ARCH)
#ifndef UInt32x32To64
#define UInt32x32To64(a, b) ((unsigned __int64)((ULONG)(a)) * (unsigned __int64)((ULONG)(b)))
#endif
#elif defined(_M_IX86)
#ifndef UInt32x32To64
#define UInt32x32To64(a, b) (unsigned __int64)((unsigned __int64)(ULONG)(a) * (ULONG)(b))
#endif
#else
#error Must define a target architecture.
#endif
namespace {
HRESULT
ULongAdd(
IN ULONG ulAugend,
IN ULONG ulAddend,
OUT ULONG* pulResult)
{
HRESULT hr = INTSAFE_E_ARITHMETIC_OVERFLOW;
*pulResult = ULONG_ERROR;
if ((ulAugend + ulAddend) >= ulAugend)
{
*pulResult = (ulAugend + ulAddend);
hr = S_OK;
}
return hr;
}
HRESULT
ULongLongToULong(
IN ULONGLONG ullOperand,
OUT ULONG* pulResult)
{
HRESULT hr = INTSAFE_E_ARITHMETIC_OVERFLOW;
*pulResult = ULONG_ERROR;
if (ullOperand <= ULONG_MAX)
{
*pulResult = (ULONG)ullOperand;
hr = S_OK;
}
return hr;
}
HRESULT
ULongMult(
IN ULONG ulMultiplicand,
IN ULONG ulMultiplier,
OUT ULONG* pulResult)
{
ULONGLONG ull64Result = UInt32x32To64(ulMultiplicand, ulMultiplier);
return ULongLongToULong(ull64Result, pulResult);
}
}
// Used to strip trailing zeros, and prevent combinatorial explosions
bool stripzeroesnum(_Inout_ PNUMBER pnum, int32_t starting);