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Add an IEEE remainder function, which is not

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fully implemented yet and not used.  This is
mainly to clarify that APFloat::mod implements
C fmod, not remainder.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@62593 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dale Johannesen 2009-01-20 18:35:05 +00:00
parent ccb3ab46f6
commit 24b66a83ca
2 changed files with 42 additions and 1 deletions
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3
include/llvm/ADT/APFloat.h
View File

@ -207,6 +207,9 @@ namespace llvm {
opStatus subtract(const APFloat &, roundingMode);
opStatus multiply(const APFloat &, roundingMode);
opStatus divide(const APFloat &, roundingMode);
/* IEEE remainder. */
opStatus remainder(const APFloat &);
/* C fmod, or llvm frem. */
opStatus mod(const APFloat &, roundingMode);
opStatus fusedMultiplyAdd(const APFloat &, const APFloat &, roundingMode);

40
lib/Support/APFloat.cpp
View File

@ -1514,7 +1514,45 @@ APFloat::divide(const APFloat &rhs, roundingMode rounding_mode)
return fs;
}
/* Normalized remainder. This is not currently doing TRT. */
/* Normalized remainder. This is not currently correct in all cases. */
APFloat::opStatus
APFloat::remainder(const APFloat &rhs)
{
opStatus fs;
APFloat V = *this;
unsigned int origSign = sign;
assertArithmeticOK(*semantics);
fs = V.divide(rhs, rmNearestTiesToEven);
if (fs == opDivByZero)
return fs;
int parts = partCount();
integerPart *x = new integerPart[parts];
bool ignored;
fs = V.convertToInteger(x, parts * integerPartWidth, true,
rmNearestTiesToEven, &ignored);
if (fs==opInvalidOp)
return fs;
fs = V.convertFromZeroExtendedInteger(x, parts * integerPartWidth, true,
rmNearestTiesToEven);
assert(fs==opOK); // should always work
fs = V.multiply(rhs, rmNearestTiesToEven);
assert(fs==opOK || fs==opInexact); // should not overflow or underflow
fs = subtract(V, rmNearestTiesToEven);
assert(fs==opOK || fs==opInexact); // likewise
if (isZero())
sign = origSign; // IEEE754 requires this
delete[] x;
return fs;
}
/* Normalized llvm frem (C fmod).
This is not currently correct in all cases. */
APFloat::opStatus
APFloat::mod(const APFloat &rhs, roundingMode rounding_mode)
{