06a10df562
Fix denormal check in float->APInt conversion.
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PR 1804.
llvm-svn: 44201
2007-11-17 01:02:27 +00:00
758d0fd736
Remove some unnecessary C-style statics.
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Restore an assertion that arithmetic can be performed on this format.
llvm-svn: 43638
2007-11-02 15:10:05 +00:00
ae077d232c
Add back line whose removal somehow crept into prior patch
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llvm-svn: 43627
2007-11-01 22:51:07 +00:00
618d0fc377
When converting to integer, do bit manipulations in the destination
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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
2007-11-01 22:43:37 +00:00
fc69d322f2
Clarified operator precedence.
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Silenced VC++ warning.
llvm-svn: 43372
2007-10-25 23:15:31 +00:00
9130551996
Fast-track obviously over-large and over-small exponents during decimal->
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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
2007-10-15 15:00:55 +00:00
5fe658b21d
Consolidate logic for creating NaNs. Silence compiler warning.
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llvm-svn: 42966
2007-10-14 10:39:51 +00:00
06077e7c3c
Whether arithmetic is supported is a property of the semantics. Make it
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so, and clean up the checks by putting them in an inline function.
llvm-svn: 42965
2007-10-14 10:29:28 +00:00
4ed401b898
Separate out parsing of decimal number. Use this to only allocate
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memory for the significand once up-front. Also ignore insignificant
trailing zeroes; this saves unnecessary multiplications later.
llvm-svn: 42964
2007-10-14 10:16:12 +00:00
c799fe9ed9
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.
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llvm-svn: 42950
2007-10-13 03:34:08 +00:00
d502a82092
Remove duplicate comment.
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llvm-svn: 42913
2007-10-12 16:05:57 +00:00
b93d90e98c
Implement correctly-rounded decimal->binary conversion, i.e. conversion
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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
2007-10-12 16:02:31 +00:00
e9dbe094aa
Remove a field that was never used.
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llvm-svn: 42911
2007-10-12 15:35:10 +00:00
146fdb3eeb
If we're trying to be arbitrary precision, unsigned char clearly won't cut it. Needed for dec->bin conversions.
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llvm-svn: 42910
2007-10-12 15:33:27 +00:00
007aa378ad
Next PPC long double bits. First cut at constants.
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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
2007-10-11 18:07:22 +00:00
49c6aab7b8
Use APInt::tcExtract. It's cleaner, and works :)
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llvm-svn: 42746
2007-10-08 14:39:42 +00:00
03f58ab706
Add back convertFromSignExtendedInteger.
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llvm-svn: 42735
2007-10-07 12:15:41 +00:00
ba205229e7
Now that convertFromUnsignedParts has a sane, constant interface,
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convertFromZeroExtendedInteger can be simplified as it doesn't need
to make a copy of the source bignum.
llvm-svn: 42734
2007-10-07 12:10:57 +00:00
6c1c8588ae
Reimplement convertFromUnsignedInteger so it is passed a const bignum.
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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
2007-10-07 12:07:53 +00:00
5f00973393
convertFromInteger, as originally written, expected sign-extended
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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
2007-10-07 11:45:55 +00:00
d3985924f4
combineLostFractions does not need to be a member function
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llvm-svn: 42729
2007-10-07 08:51:21 +00:00
32897f5eb0
Cleaner, more general exponent output.
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llvm-svn: 42690
2007-10-06 07:29:25 +00:00
2a9bcb9ea7
silence warnings in no-assert build.
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llvm-svn: 42687
2007-10-06 06:13:42 +00:00
0ea72a9a91
Generalize tcFullMultiply so that the operands can be of differing
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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
2007-10-06 00:24:48 +00:00
8f1946fa22
Add APFloat -> hexadecimal string conversion, as per %a and %A in C99.
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Useful for diagnostics and debugging.
llvm-svn: 42598
2007-10-03 22:26:02 +00:00
1ca1f80b38
Tweak RoundAwayFromZero the bit number below which is truncated, and make
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it const.
Preparation for APFloat -> hexadecimal string conversion.
llvm-svn: 42576
2007-10-03 15:16:41 +00:00
28a2c4a9c4
Simplify and fix signed int -> FP conversions.
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llvm-svn: 42483
2007-09-30 18:17:01 +00:00
9acbf5aaf9
Whitespace and compiler warning cleanup.
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llvm-svn: 42373
2007-09-26 21:33:42 +00:00
e7439eff5a
Make APFloat->int conversions deterministic even in
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cases with undefined behavior.
llvm-svn: 42328
2007-09-25 23:07:07 +00:00
4f55d9fe0f
Fix long double<->shorter FP type conversions
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of zero, infinity, and NaNs.
llvm-svn: 42298
2007-09-25 17:25:00 +00:00
a8d7269269
Handle storage complications of float->float conversions.
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llvm-svn: 42220
2007-09-22 02:56:19 +00:00
4230512f32
Change APFloat::convertFromInteger to take the incoming
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bit width instead of number of words allocated, which
makes it actually work for int->APF conversions.
Adjust callers. Add const to one of the APInt constructors
to prevent surprising match when called with const
argument.
llvm-svn: 42210
2007-09-21 22:09:37 +00:00
146a0ea071
Fix PR 1688. See comments there.
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llvm-svn: 42181
2007-09-20 23:47:58 +00:00
58c468fb09
Remove spurious consts. This fixes warnings with compilers that
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are strict about such things.
llvm-svn: 41956
2007-09-14 20:08:19 +00:00
521988b604
Compensate for partCount change in Bogus definition
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(could break hash table in ConstantFP)
llvm-svn: 41874
2007-09-12 01:22:05 +00:00
245dceb06d
Add APInt interfaces to APFloat (allows directly
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access to bits). Use them in place of float and
double interfaces where appropriate.
First bits of x86 long double constants handling
(untested, probably does not work).
llvm-svn: 41858
2007-09-11 18:32:33 +00:00
728687c423
Fix mod so it actually works. Fix conversions to
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native types to handle denormals correctly.
llvm-svn: 41726
2007-09-05 20:39:49 +00:00
689d17d282
Oops, should be part of 41664; won't work very well without this piece.
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llvm-svn: 41665
2007-08-31 23:35:31 +00:00
3cf889f75e
Enhance APFloat to retain bits of NaNs (fixes oggenc).
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Use APFloat interfaces for more references, mostly
of ConstantFPSDNode.
llvm-svn: 41632
2007-08-31 04:03:46 +00:00
d246b2ca5c
Change LegalFPImmediates to use APFloat.
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Add APFloat interfaces to ConstantFP, SelectionDAG.
Fix integer bit in double->APFloat conversion.
Convert LegalizeDAG to use APFloat interface in
ConstantFPSDNode uses.
llvm-svn: 41587
2007-08-30 00:23:21 +00:00
bdea32d812
Poison APFloat::operator==. Replace existing uses with bitwiseIsEqual.
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This means backing out the preceding change to Constants.cpp, alas.
llvm-svn: 41378
2007-08-24 22:09:56 +00:00
918c33c67a
Revised per review feedback from previous patch.
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llvm-svn: 41353
2007-08-24 05:08:11 +00:00
3da18eb22a
silence some warnings in an optimized build.
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llvm-svn: 41352
2007-08-24 03:02:34 +00:00
a719a60609
Change internal representation of ConstantFP to use APFloat.
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Interface to rest of the compiler unchanged, as yet.
llvm-svn: 41348
2007-08-24 00:56:33 +00:00
fe02c1f97f
initial checkin of Neil's APFloat work.
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llvm-svn: 41203
2007-08-20 22:49:32 +00:00
Dale Johannesen