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82 Commits

Author SHA1 Message Date
Michael Gottesman 0c622ea8d3 Implement IEEE-754R 2008 nextUp/nextDown functions in the guise of the function APFloat::next(bool nextDown). 
rdar://13852078

llvm-svn: 182945
 2013-05-30 18:07:13 +00:00
Michael Gottesman 0db7c27c2d Added a unittest for APFloat::getSmallestNormalized. 
llvm-svn: 182897
 2013-05-30 00:18:47 +00:00
Michael Gottesman 5455d5b987 Added code to the unittest for APFloat::getSmallest to double check that we consider the result to be denormal. 
I additionally changed certain checks to use EXPECT_FALSE instead of a boolean
complement with EXPECT_TRUE.

llvm-svn: 182896
 2013-05-30 00:18:44 +00:00
Michael Gottesman 63e6d21c72 Add a unittest for APFloat::getSmallest. 
llvm-svn: 182894
 2013-05-29 23:58:29 +00:00
Shuxin Yang bbddbacd2e Fix a bug that APFloat::fusedMultiplyAdd() mistakenly evaluate "14.5f * -14.5f + 225.0f" to 225.0f. 
llvm-svn: 181715
 2013-05-13 18:03:12 +00:00
Benjamin Kramer b361adbb64 APFloat: Make sure that we get a well-formed x87 NaN when converting from a smaller type. 
Fixes PR15054.

llvm-svn: 173459
 2013-01-25 17:01:00 +00:00
Shuxin Yang 4fb504fec1 Implement APFloat::isDenormal() 
llvm-svn: 171764
 2013-01-07 18:59:35 +00:00
Chandler Carruth 130cec21b9 Sort the #include lines for unittest/... 
llvm-svn: 169250
 2012-12-04 10:23:08 +00:00
Benjamin Kramer 08be41adbf Drop the limitation to IEEE floating point types from the fdiv of pow2 -> fmul transform. 
This is safe for x87 long doubles and ppc double doubles too.

llvm-svn: 167582
 2012-11-08 13:58:10 +00:00
Ulrich Weigand d9f7e259aa Implement arithmetic on APFloat with PPCDoubleDouble semantics by 
treating it as if it were an IEEE floating-point type with 106-bit
mantissa.

This makes compile-time arithmetic on "long double" for PowerPC
in clang (in particular parsing of floating point constants)
work, and fixes all "long double" related failures in the test
suite.

llvm-svn: 166951
 2012-10-29 18:09:01 +00:00
Benjamin Kramer c38fab2013 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
Owen Anderson 352dfff447 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 1ff74b0d2d 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
Eli Friedman a84ad7d0d0 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 212e447967 Attempt to fix MSVC build. 
llvm-svn: 141831
 2011-10-12 23:14:41 +00:00
Eli Friedman c53220134a 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
Matt Beaumont-Gay a421ee10b2 Fix a test that wasn't testing the right thing. 
The APFloat "Zero" test was actually calling the
APFloat(const fltSemantics &, integerPart) constructor, and EXPECT_EQ was
treating 0 and -0 as equal.

llvm-svn: 138745
 2011-08-29 17:54:20 +00:00
Jeffrey Yasskin 03b81a2eb4 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
Benjamin Kramer af0ed953c5 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 03fd672609 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
Jeffrey Yasskin b5cd01335b Fix death tests in -Asserts builds. 
llvm-svn: 98701
 2010-03-17 01:18:45 +00:00
John McCall dcb9a7ad3d 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 b42cc681ba 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 df951bddb8 Make APInt::countLeadingZerosSlowCase() treat the contents of padding bits 
as undefined.  Fixes an assertion in APFloat::toString noticed by Dale.

llvm-svn: 95196
 2010-02-03 03:42:44 +00:00
John McCall dd5044ac55 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 29b5c284ae 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
Daniel Dunbar bc52e4fe73 Add test for PR4873, which works for me. 
llvm-svn: 80965
 2009-09-03 22:57:02 +00:00
Erick Tryzelaar da666c801c 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 bf5998edfb Fix two APFloat bugs in converting hexadecimal constants. 
llvm-svn: 79540
 2009-08-20 17:12:33 +00:00
Erick Tryzelaar 927191f179 Wrap unit test death tests in GTEST_HAS_DEATH_TEST 
llvm-svn: 79218
 2009-08-17 00:55:33 +00:00
Erick Tryzelaar bc0d74944e Change APFloatTest from using ASSERTs to EXPECTs 
llvm-svn: 79216
 2009-08-17 00:14:11 +00:00
Erick Tryzelaar 19f63b2e4d 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