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Add a method to APFloat to convert directly from APInt.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47738 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2008-02-29 01:26:11 +00:00
parent d703ed6aed
commit 93c276e1c9
2 changed files with 19 additions and 0 deletions
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2
include/llvm/ADT/APFloat.h
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@ -208,6 +208,8 @@ namespace llvm {
opStatus convert(const fltSemantics &, roundingMode);
opStatus convertToInteger(integerPart *, unsigned int, bool,
roundingMode) const;
opStatus convertFromAPInt(const APInt &,
bool, roundingMode);
opStatus convertFromSignExtendedInteger(const integerPart *, unsigned int,
bool, roundingMode);
opStatus convertFromZeroExtendedInteger(const integerPart *, unsigned int,

17
lib/Support/APFloat.cpp
View File

@ -1913,6 +1913,23 @@ APFloat::convertFromUnsignedParts(const integerPart *src,
return normalize(rounding_mode, lost_fraction);
}
APFloat::opStatus
APFloat::convertFromAPInt(const APInt &Val,
bool isSigned,
roundingMode rounding_mode)
{
unsigned int partCount = Val.getNumWords();
APInt api = Val;
sign = false;
if (isSigned && api.isNegative()) {
sign = true;
api = -api;
}
return convertFromUnsignedParts(api.getRawData(), partCount, rounding_mode);
}
/* Convert a two's complement integer SRC to a floating point number,
rounding according to ROUNDING_MODE. ISSIGNED is true if the
integer is signed, in which case it must be sign-extended. */