Add getSizeInBits function to the APFloat class
The newly added function returns the size of the specified floating
point semantics in bits.
Differential revision: http://reviews.llvm.org/D8413
llvm-svn: 241793
diff --git a/llvm/lib/Support/APFloat.cpp b/llvm/lib/Support/APFloat.cpp
index 4b0a0e5..5d31225 100644
--- a/llvm/lib/Support/APFloat.cpp
+++ b/llvm/lib/Support/APFloat.cpp
@@ -52,14 +52,17 @@
/* 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 @@
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 @@
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 @@
}
}
+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) {