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Add getSizeInBits function to the APFloat class

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The newly added function returns the size of the specified floating
point semantics in bits.

Differential revision: http://reviews.llvm.org/D8413

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@241793 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Tamas Berghammer 2015-07-09 10:13:39 +00:00
parent b0205f5937
commit 6055ca7bf4
2 changed files with 19 additions and 8 deletions
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4
include/llvm/ADT/APFloat.h
View File

@ -276,6 +276,10 @@ public:
/// \param isIEEE - If 128 bit number, select between PPC and IEEE
static APFloat getAllOnesValue(unsigned BitWidth, bool isIEEE = false);
/// Returns the size of the floating point number (in bits) in the given
/// semantics.
static unsigned getSizeInBits(const fltSemantics &Sem);
/// @}
/// Used to insert APFloat objects, or objects that contain APFloat objects,

23
lib/Support/APFloat.cpp
View File

@ -52,14 +52,17 @@ namespace llvm {
/* Number of bits in the significand. This includes the integer
bit. */
unsigned int precision;
/* Number of bits actually used in the semantics. */
unsigned int sizeInBits;
};
const fltSemantics APFloat::IEEEhalf = { 15, -14, 11 };
const fltSemantics APFloat::IEEEsingle = { 127, -126, 24 };
const fltSemantics APFloat::IEEEdouble = { 1023, -1022, 53 };
const fltSemantics APFloat::IEEEquad = { 16383, -16382, 113 };
const fltSemantics APFloat::x87DoubleExtended = { 16383, -16382, 64 };
const fltSemantics APFloat::Bogus = { 0, 0, 0 };
const fltSemantics APFloat::IEEEhalf = { 15, -14, 11, 16 };
const fltSemantics APFloat::IEEEsingle = { 127, -126, 24, 32 };
const fltSemantics APFloat::IEEEdouble = { 1023, -1022, 53, 64 };
const fltSemantics APFloat::IEEEquad = { 16383, -16382, 113, 128 };
const fltSemantics APFloat::x87DoubleExtended = { 16383, -16382, 64, 80 };
const fltSemantics APFloat::Bogus = { 0, 0, 0, 0 };
/* The PowerPC format consists of two doubles. It does not map cleanly
onto the usual format above. It is approximated using twice the
@ -72,7 +75,7 @@ namespace llvm {
to represent all possible values held by a PPC double-double number,
for example: (long double) 1.0 + (long double) 0x1p-106
Should this be replaced by a full emulation of PPC double-double? */
const fltSemantics APFloat::PPCDoubleDouble = { 1023, -1022 + 53, 53 + 53 };
const fltSemantics APFloat::PPCDoubleDouble = { 1023, -1022 + 53, 53 + 53, 128 };
/* A tight upper bound on number of parts required to hold the value
pow(5, power) is
@ -2416,7 +2419,7 @@ APFloat::roundSignificandWithExponent(const integerPart *decSigParts,
roundingMode rounding_mode)
{
unsigned int parts, pow5PartCount;
fltSemantics calcSemantics = { 32767, -32767, 0 };
fltSemantics calcSemantics = { 32767, -32767, 0, 0 };
integerPart pow5Parts[maxPowerOfFiveParts];
bool isNearest;
@ -3368,6 +3371,10 @@ APFloat::getAllOnesValue(unsigned BitWidth, bool isIEEE)
}
}
unsigned APFloat::getSizeInBits(const fltSemantics &Sem) {
return Sem.sizeInBits;
}
/// Make this number the largest magnitude normal number in the given
/// semantics.
void APFloat::makeLargest(bool Negative) {