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138 Commits

Author SHA1 Message Date
Benjamin Kramer
6b5f441814 APFloat::roundToIntegral: Special values don't keep the exponent value up to date, don't rely on it. 
Add a couple of unit tests for special floats. Fixes 13929, found by MemorySanitizer.

llvm-svn: 164698
 2012-09-26 14:06:58 +00:00
Richard Smith
e0eabcc41b Fix undefined behavior (signed integer overflow) when Clang parses a hexfloat with an enormous exponent. Caught by an existing unit test + -ftrapv. 
llvm-svn: 162505
 2012-08-24 00:01:19 +00:00
Owen Anderson
903f25db0a Fix another roundToIntegral bug where very large values could become infinity. Problem and solution identified by Steve Canon. 
llvm-svn: 161969
 2012-08-15 18:28:45 +00:00
Owen Anderson
a39979db7d Fix typo in comment. 
llvm-svn: 161956
 2012-08-15 16:42:53 +00:00
Owen Anderson
3b09e94409 Fix a problem with APFloat::roundToIntegral where it would return incorrect results for negative inputs to trunc. Add unit tests to verify this behavior. 
llvm-svn: 161929
 2012-08-15 05:39:46 +00:00
Owen Anderson
0db4c468c5 Fix the construction of the magic constant for roundToIntegral to be 64-bit safe. Fixes c-torture/execute/990826-0.c 
llvm-svn: 161885
 2012-08-14 18:51:15 +00:00
Owen Anderson
c5b77c0317 Add a roundToIntegral method to APFloat, which can be parameterized over various rounding modes. Use this to implement SelectionDAG constant folding of FFLOOR, FCEIL, and FTRUNC. 
llvm-svn: 161807
 2012-08-13 23:32:49 +00:00
David Blaikie
367f29c46b Don't add null characters to the end of the APFloat string buffer. 
Report/patch inspiration by Olaf Krzikalla.

llvm-svn: 160744
 2012-07-25 18:04:24 +00:00
Chandler Carruth
a93fbd8fff Replace the hashing functions on APInt and APFloat with overloads of the 
new hash_value infrastructure, and replace their implementations using
hash_combine. This removes a complete copy of Jenkin's lookup3 hash
function (which is both significantly slower and lower quality than the
one implemented in hash_combine) along with a somewhat scary xor-only
hash function.

Now that APInt and APFloat can be passed directly to hash_combine,
simplify the rest of the LLVMContextImpl hashing to use the new
infrastructure.

llvm-svn: 152004
 2012-03-04 12:02:57 +00:00
NAKAMURA Takumi
4518369791 APFloat::toString(): Fix overrun at scanning. 
FYI, clang/test/SemaTemplate/template-id-printing.cpp had been failing due to it on cygwin-clang.

llvm-svn: 150911
 2012-02-19 03:18:29 +00:00
Chandler Carruth
2a6b59a693 Add 'llvm_unreachable' to passify GCC's understanding of the constraints 
of several newly un-defaulted switches. This also helps optimizers
(including LLVM's) recognize that every case is covered, and we should
assume as much.

llvm-svn: 147861
 2012-01-10 18:08:01 +00:00
David Blaikie
8d47bb30e3 Remove unnecessary default cases in switches that cover all enum values. 
llvm-svn: 147855
 2012-01-10 16:47:17 +00:00
Eli Friedman
4da2d1759d Add back a line I deleted by accident in r145141. Fixes uninitialized variable warnings and runtime failures. 
llvm-svn: 145256
 2011-11-28 18:50:37 +00:00
Eli Friedman
448be745f6 Fix APFloat::convert so that it handles narrowing conversions correctly; it 
was returning incorrect values in rare cases, and incorrectly marking
exact conversions as inexact in some more common cases. Fixes PR11406, and a
missed optimization in test/CodeGen/X86/fp-stack-O0.ll.

llvm-svn: 145141
 2011-11-26 03:38:02 +00:00
Eli Friedman
d9ebbc6cf5 Fix APFloat::getSmallestNormalized so the shift doesn't depend on undefined behavior. Patch from Ahmed Charles. 
llvm-svn: 141818
 2011-10-12 21:56:19 +00:00
Eli Friedman
cda27f4c18 Fix APFloat::getLargest so that it actually returns the correct value. Found by accident while reviewing a patch to nearby code. 
llvm-svn: 141816
 2011-10-12 21:51:36 +00:00
Eli Friedman
433785c651 Fix APInt::operator*= so that it computes the correct result for large integers where there is unsigned overflow. Fix APFloat::toString so that it doesn't depend on the incorrect behavior in common cases (and computes the correct result in some rare cases). Fixes PR11086. 
llvm-svn: 141441
 2011-10-07 23:40:49 +00:00
Nick Lewycky
e394c128ac Fix typo in comments. 
llvm-svn: 141032
 2011-10-03 21:30:08 +00:00
Duncan Sands
10a9e984bc Silence a bunch (but not all) "variable written but not read" warnings 
when building with assertions disabled.

llvm-svn: 137460
 2011-08-12 14:54:45 +00:00
Jeffrey Yasskin
2e0f2a0985 Add APInt(numBits, ArrayRef<uint64_t> bigVal) constructor to prevent future ambiguity 
errors like the one corrected by r135261.  Migrate all LLVM callers of the old
constructor to the new one.

llvm-svn: 135431
 2011-07-18 21:45:40 +00:00
Chandler Carruth
cbac5b4434 Explicitly cast the second argument to unsigned in order to select the 
desired overload.

This is a bit of a hackish workaround to fix the compile after r135259.
Let me know if there is a better approach.

llvm-svn: 135261
 2011-07-15 07:31:10 +00:00
Jeffrey Yasskin
4d5d3fceaa Add an APFloat::convertToInt(APSInt) function that automatically manages the 
memory for the result.

llvm-svn: 135259
 2011-07-15 07:04:56 +00:00
Chris Lattner
0304b82f80 Fix a ton of comment typos found by codespell. Patch by 
Luis Felipe Strano Moraes!

llvm-svn: 129558
 2011-04-15 05:18:47 +00:00
Benjamin Kramer
e6e5b11a65 Avoid turning a floating point division with a constant power of two into a denormal multiplication. 
Some platforms may treat denormals as zero, on other platforms multiplication
with a subnormal is slower than dividing by a normal.

llvm-svn: 128555
 2011-03-30 17:02:54 +00:00
Benjamin Kramer
7888d0935d Add APFloat::getExactInverse. 
The idea is, that if an ieee 754 float is divided by a power of two, we can
turn the division into a cheaper multiplication. This function sees if we can
get an exact multiplicative inverse for a divisor and returns it if possible.

This is the hard part of PR9587.

I tested many inputs against llvm-gcc's frotend implementation of this
optimization and didn't find any difference. However, floating point is the
land of weird edge cases, so any review would be appreciated.

llvm-svn: 128545
 2011-03-30 15:42:27 +00:00
Bill Wendling
8a983f8c3f Initialize the only-used-with-PPC-double-double parts of the APFloat class. This 
makes valgrind stop complaining about uninitialized variables being read when it
accesses a bitfield (category) that shares its bits with these variables.

llvm-svn: 127871
 2011-03-18 09:09:44 +00:00
Nadav Rotem
ad2fd4eada Enhance constant folding of bitcast operations on vectors of floats. 
Add getAllOnesValue of FP numbers to Constants and APFloat.
Add more tests.

llvm-svn: 125776
 2011-02-17 21:22:27 +00:00
Ted Kremenek
880c19c032 Null initialize a few variables flagged by 
clang's -Wuninitialized-experimental warning.
While these don't look like real bugs, clang's
-Wuninitialized-experimental analysis is stricter
than GCC's, and these fixes have the benefit
of being general nice cleanups.

llvm-svn: 124073
 2011-01-23 17:05:06 +00:00
Abramo Bagnara
d4c067af6e Fixed parsing of hex floats. 
llvm-svn: 122963
 2011-01-06 16:55:14 +00:00
Jay Foad
79e18ed269 PR5207: Change APInt methods trunc(), sext(), zext(), sextOrTrunc() and 
zextOrTrunc(), and APSInt methods extend(), extOrTrunc() and new method
trunc(), to be const and to return a new value instead of modifying the
object in place.

llvm-svn: 121120
 2010-12-07 08:25:19 +00:00
Jay Foad
7378352505 PR5207: change APInt::doubleToBits() and APInt::floatToBits() to be 
static methods that return a new APInt.

llvm-svn: 120261
 2010-11-28 21:04:48 +00:00
Dale Johannesen
579b1bef32 Do not assert when reading an exponent out of range. 
llvm-svn: 111534
 2010-08-19 17:58:35 +00:00
Benjamin Kramer
da3e6cdb26 Don't pass StringRef by reference. 
llvm-svn: 108366
 2010-07-14 22:38:02 +00:00
Dan Gohman
177e2ae058 Fix minor style issues. 
llvm-svn: 99414
 2010-03-24 19:38:02 +00:00
Chris Lattner
a446775fd5 make APFloat::toString be const. 
llvm-svn: 97883
 2010-03-06 19:20:13 +00:00
John McCall
e5b0ef9279 Don't potentially read past the end of the fill data when making a NaN from 
an APInt.

llvm-svn: 97467
 2010-03-01 18:38:45 +00:00
John McCall
f3fa6eb2ad Properly clear all the extra bits in a significand when making a NaN from an 
APInt.  Be certain to set the integer bit in an x87 extended-precision
significand so that we don't accidentally make a pseudo-NaN.

llvm-svn: 97382
 2010-02-28 12:49:50 +00:00
John McCall
69bc985550 Teach APFloat how to create both QNaNs and SNaNs and with arbitrary-width 
payloads.  APFloat's internal folding routines always make QNaNs now,
instead of sometimes making QNaNs and sometimes SNaNs depending on the
type.

llvm-svn: 97364
 2010-02-28 02:51:25 +00:00
John McCall
bb9c3309b2 Make APFloat's string-parsing routines a bit safer against very large exponents. 
llvm-svn: 97278
 2010-02-26 22:20:41 +00:00
John McCall
75f1b8beeb Implement support for converting to string at "natural precision", and fix some 
major bugs in long-precision conversion.

llvm-svn: 92150
 2009-12-24 23:18:09 +00:00
John McCall
c6cdebbedd Substantially optimize APFloat::toString() by doing a single large divide to 
cut the significand down to the desired precision *before* entering the
core divmod loop.  Makes the overall algorithm logarithmic in the exponent.

There's still a lot of room for improvement here, but this gets the
performance back down to acceptable-for-diagnostics levels, even for
long doubles.
negligible, even on long doubles.

llvm-svn: 92130
 2009-12-24 12:16:56 +00:00
John McCall
c71c44ec7f Add accessors for the largest-magnitude, smallest-magnitude, and 
smallest-normalized-magnitude values in a given FP semantics.
Provide an APFloat-to-string conversion which I am quite ready to admit could
be much more efficient.

llvm-svn: 92126
 2009-12-24 08:56:26 +00:00
Evan Cheng
1c7dfce330 Remove getIEEEFloatParts and getIEEEDoubleParts. They are not needed. 
llvm-svn: 85358
 2009-10-28 01:08:17 +00:00
Evan Cheng
b6b5214744 Add new APFloat methods that return sign, exp, and mantissa of ieee float and double values. 
llvm-svn: 85318
 2009-10-27 21:35:42 +00:00
Dale Johannesen
3f91e235b8 Commit fixes for half precision I noted in review, so 
they don't get lost; I don't think the originator has
write access.

llvm-svn: 84928
 2009-10-23 04:02:51 +00:00
Chris Lattner
5d2b384837 Add half precision floating point support (float16) to APFloat, 
patch by Peter Johnson! (PR5195)

llvm-svn: 84239
 2009-10-16 02:13:51 +00:00
Chris Lattner
b1cc232ab2 wrap long lines. 
llvm-svn: 82715
 2009-09-24 21:44:20 +00:00
Chris Lattner
09084c45af add a version of the APFloat constructor that initializes to 0.0 
llvm-svn: 82110
 2009-09-17 01:08:43 +00:00
Anton Korobeynikov
31ef120005 Fix typo. 
llvm-svn: 79688
 2009-08-21 23:09:47 +00:00
Anton Korobeynikov
bb4c910976 Implement APInt <-> APFloat conversion for IEEE 128-bit floats. 
This fixes PR2555

llvm-svn: 79677
 2009-08-21 22:10:30 +00:00