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Add support for letting the client choose different flavors of NaNs. Testcase to be

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added in clang.

llvm-svn: 72606
This commit is contained in:
Mike Stump 2009-05-30 03:49:43 +00:00
parent 8235a05c1a
commit 5447116cbb
2 changed files with 17 additions and 10 deletions
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9
include/llvm/ADT/APFloat.h
View File

@ -174,7 +174,7 @@ namespace llvm {
// Constructors.
APFloat(const fltSemantics &, const char *);
APFloat(const fltSemantics &, integerPart);
APFloat(const fltSemantics &, fltCategory, bool negative);
APFloat(const fltSemantics &, fltCategory, bool negative, unsigned type=0);
explicit APFloat(double d);
explicit APFloat(float f);
explicit APFloat(const APInt &, bool isIEEE = false);
@ -188,8 +188,9 @@ namespace llvm {
static APFloat getInf(const fltSemantics &Sem, bool Negative = false) {
return APFloat(Sem, fcInfinity, Negative);
}
static APFloat getNaN(const fltSemantics &Sem, bool Negative = false) {
return APFloat(Sem, fcNaN, Negative);
static APFloat getNaN(const fltSemantics &Sem, bool Negative = false,
long unsigned type=0) {
return APFloat(Sem, fcNaN, Negative, type);
}
/// Profile - Used to insert APFloat objects, or objects that contain
@ -296,7 +297,7 @@ namespace llvm {
opStatus modSpecials(const APFloat &);
/* Miscellany. */
void makeNaN(void);
void makeNaN(unsigned = 0);
opStatus normalize(roundingMode, lostFraction);
opStatus addOrSubtract(const APFloat &, roundingMode, bool subtract);
cmpResult compareAbsoluteValue(const APFloat &) const;

18
lib/Support/APFloat.cpp
View File

@ -598,12 +598,18 @@ APFloat::copySignificand(const APFloat &rhs)
/* Make this number a NaN, with an arbitrary but deterministic value
for the significand. If double or longer, this is a signalling NaN,
which may not be ideal. */
which may not be ideal. If float, this is QNaN(0). */
void
APFloat::makeNaN(void)
APFloat::makeNaN(unsigned type)
{
category = fcNaN;
APInt::tcSet(significandParts(), ~0U, partCount());
// FIXME: Add double and long double support for QNaN(0).
if (semantics->precision == 24 && semantics->maxExponent == 127) {
type |= 0x7fc00000U;
type &= ~0x80000000U;
} else
type = ~0U;
APInt::tcSet(significandParts(), type, partCount());
}
APFloat &
@ -662,16 +668,16 @@ APFloat::APFloat(const fltSemantics &ourSemantics, integerPart value)
}
APFloat::APFloat(const fltSemantics &ourSemantics,
fltCategory ourCategory, bool negative)
fltCategory ourCategory, bool negative, unsigned type)
{
assertArithmeticOK(ourSemantics);
initialize(&ourSemantics);
category = ourCategory;
sign = negative;
if(category == fcNormal)
if (category == fcNormal)
category = fcZero;
else if (ourCategory == fcNaN)
makeNaN();
makeNaN(type);
}
APFloat::APFloat(const fltSemantics &ourSemantics, const char *text)