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Add back convertFromSignExtendedInteger.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42735 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Neil Booth 2007-10-07 12:15:41 +00:00
parent 7a7bc0f724
commit f16c595252
2 changed files with 32 additions and 0 deletions
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2
include/llvm/ADT/APFloat.h
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@ -194,6 +194,8 @@ namespace llvm {
opStatus convert(const fltSemantics &, roundingMode);
opStatus convertToInteger(integerPart *, unsigned int, bool,
roundingMode) const;
opStatus convertFromSignExtendedInteger(const integerPart *, unsigned int,
bool, roundingMode);
opStatus convertFromZeroExtendedInteger(const integerPart *, unsigned int,
bool, roundingMode);
opStatus convertFromString(const char *, roundingMode);

30
lib/Support/APFloat.cpp
View File

@ -1587,6 +1587,36 @@ APFloat::convertFromUnsignedParts(const integerPart *src,
return normalize(rounding_mode, lost_fraction);
}
/* 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. */
APFloat::opStatus
APFloat::convertFromSignExtendedInteger(const integerPart *src,
unsigned int srcCount,
bool isSigned,
roundingMode rounding_mode)
{
opStatus status;
if (isSigned
&& APInt::tcExtractBit(src, srcCount * integerPartWidth - 1)) {
integerPart *copy;
/* If we're signed and negative negate a copy. */
sign = true;
copy = new integerPart[srcCount];
APInt::tcAssign(copy, src, srcCount);
APInt::tcNegate(copy, srcCount);
status = convertFromUnsignedParts(copy, srcCount, rounding_mode);
delete [] copy;
} else {
sign = false;
status = convertFromUnsignedParts(src, srcCount, rounding_mode);
}
return status;
}
/* FIXME: should this just take a const APInt reference? */
APFloat::opStatus
APFloat::convertFromZeroExtendedInteger(const integerPart *parts,