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126 Commits

Author SHA1 Message Date
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
Erick Tryzelaar
6bd69aaa86 Add support for including '+' in APFloat strings, more asserts, 
and many new unit tests.

llvm-svn: 79574
 2009-08-20 23:30:43 +00:00
Daniel Dunbar
9ad4b47cec Fix two APFloat bugs in converting hexadecimal constants. 
llvm-svn: 79540
 2009-08-20 17:12:33 +00:00
Erick Tryzelaar
fc2856cec4 Fix an uninitialized value warning in APFloat. 
llvm-svn: 79353
 2009-08-18 18:20:37 +00:00
Erick Tryzelaar
930c879b9e Modify APFloat to take a StringRef instead of a c string. 
This also adds unit tests to APFloat that mainly tests the
string handling of APFloat, but not much else of it's api.

llvm-svn: 79210
 2009-08-16 23:36:19 +00:00
Torok Edwin
f955a6ef49 llvm_unreachable->llvm_unreachable(0), LLVM_UNREACHABLE->llvm_unreachable. 
This adds location info for all llvm_unreachable calls (which is a macro now) in
!NDEBUG builds.
In NDEBUG builds location info and the message is off (it only prints
"UREACHABLE executed").

llvm-svn: 75640
 2009-07-14 16:55:14 +00:00
Torok Edwin
ae8a3ff177 assert(0) -> LLVM_UNREACHABLE. 
Make llvm_unreachable take an optional string, thus moving the cerr<< out of
line.
LLVM_UNREACHABLE is now a simple wrapper that makes the message go away for
NDEBUG builds.

llvm-svn: 75379
 2009-07-11 20:10:48 +00:00
Mike Stump
5447116cbb Add support for letting the client choose different flavors of NaNs. Testcase to be 
added in clang.

llvm-svn: 72606
 2009-05-30 03:49:43 +00:00
Mike Stump
6666fa7a2c Fix whitespacing (space after switch). 
llvm-svn: 71738
 2009-05-13 23:23:20 +00:00
Dale Johannesen
34123aba43 Fix internal representation of fp80 to be the 
same as a normal i80 {low64, high16} rather
than its own {high64, low16}.  A depressing number
of places know about this; I think I got them all.
Bitcode readers and writers convert back to the old
form to avoid breaking compatibility.

llvm-svn: 67562
 2009-03-23 21:16:53 +00:00
Chris Lattner
6f7628bd8e just initialize the first element, we don't need to set the rest to zeros. 
llvm-svn: 66850
 2009-03-13 00:24:01 +00:00
Chris Lattner
99b48e57ba Eliminate a 9640 byte static mutable initialized data item by moving it 
to the stack.  This shrinks all llvm tools by 9k, and improves reentrancy.

llvm-svn: 66847
 2009-03-13 00:03:51 +00:00
Chris Lattner
f835ec9a9d static functions don't need an anonymous namespace. 
llvm-svn: 66845
 2009-03-12 23:59:55 +00:00