Restore an assertion that arithmetic can be performed on this format.

llvm-svn: 43638

llvm-svn: 43627

memory rather than in a copy of the APFloat.  This avoids problems
when the destination is wider than our significand and is cleaner.

Also provide deterministic values in all cases where conversion
fails, namely zero for NaNs and the minimal or maximal value
respectively for underflow or overflow.

llvm-svn: 43626

Silenced VC++ warning.

llvm-svn: 43372

and tblgen requires rtti.

llvm-svn: 43127

integer conversion.  In some such cases this makes us one or two orders
of magnitude faster than NetBSD's libc.  Glibc seems to have a similar
fast path.

Also, tighten up some upper bounds to save a bit of memory.

llvm-svn: 42984

llvm-svn: 42966

so, and clean up the checks by putting them in an inline function.

llvm-svn: 42965

memory for the significand once up-front.  Also ignore insignificant
trailing zeroes; this saves unnecessary multiplications later.

llvm-svn: 42964

If the power of 5 is exact, and the reciprocal exact, the error is zero not one half-ulps.  This prevents an infinite loop in rare cases.

llvm-svn: 42950

llvm-svn: 42913

from user input strings.

Such conversions are more intricate and subtle than they may appear;
it is unlikely I have got it completely right first time.  I would
appreciate being informed of any bugs and incorrect roundings you
might discover.

llvm-svn: 42912

llvm-svn: 42911

If we're trying to be arbitrary precision, unsigned char clearly won't cut it.  Needed for dec->bin conversions.

llvm-svn: 42910

llvm-svn: 42909

No compile-time support for constant operations yet,
just format transformations.  Make readers and
writers work.  Split constants into 2 doubles in
Legalize.

llvm-svn: 42865

llvm-svn: 42815

llvm-svn: 42788

llvm-svn: 42781

commands and into the common code.

llvm-svn: 42752

llvm-svn: 42746

arbitrary range of bits embedded in the middle of another bignum.
This kind of operation is desirable in many cases of software
floating point, e.g. converting bignum integers to floating point
numbers of fixed precision (you want to extract the precision most
significant bits).

Elsewhere, add an assertion, and exit the shift functions early if
the shift count is zero.

llvm-svn: 42745

llvm-svn: 42735

convertFromZeroExtendedInteger can be simplified as it doesn't need
to make a copy of the source bignum.

llvm-svn: 42734

It used to modify its argument in-place.

This interface is saner and the implementation more efficient.  It will
be needed for decimal->binary conversion.

llvm-svn: 42733

input.  APInt unfortunately zero-extends signed integers, so Dale
modified the function to expect zero-extended input.  Make this
assumption explicit in the function name.

llvm-svn: 42732

llvm-svn: 42729

llvm-svn: 42690

llvm-svn: 42687

llvm-svn: 42670

part widths.  Also, return the number of parts actually required to
hold the result's value.
Remove an over-cautious condition from rounding of float->hex conversion.

llvm-svn: 42669

Useful for diagnostics and debugging.

llvm-svn: 42598

llvm-svn: 42589

to giving it iterators.

llvm-svn: 42586

it const.

Preparation for APFloat -> hexadecimal string conversion.

llvm-svn: 42576

llvm-svn: 42483

llvm-svn: 42373

cases with undefined behavior.

llvm-svn: 42328

of zero, infinity, and NaNs.

llvm-svn: 42298

llvm-svn: 42220