Commit Graph

23 Commits

Author SHA1 Message Date
Ulrich Weigand
69c9c8c4cf 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.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166951 91177308-0d34-0410-b5e6-96231b3b80d8
2012-10-29 18:09:01 +00:00
Benjamin Kramer
3e7735fe1c 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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@164698 91177308-0d34-0410-b5e6-96231b3b80d8
2012-09-26 14:06:58 +00:00
Owen Anderson
c82cc587a4 Fix another roundToIntegral bug where very large values could become infinity. Problem and solution identified by Steve Canon.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161969 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-15 18:28:45 +00:00
Owen Anderson
f7a5dfcb3b Fix a problem with APFloat::roundToIntegral where it would return incorrect results for negative inputs to trunc. Add unit tests to verify this behavior.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161929 91177308-0d34-0410-b5e6-96231b3b80d8
2012-08-15 05:39:46 +00:00
Eli Friedman
4455142a95 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.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145141 91177308-0d34-0410-b5e6-96231b3b80d8
2011-11-26 03:38:02 +00:00
Eli Friedman
a3a1635d04 Attempt to fix MSVC build.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@141831 91177308-0d34-0410-b5e6-96231b3b80d8
2011-10-12 23:14:41 +00:00
Eli Friedman
7247a5f20e Fix APFloat::getLargest so that it actually returns the correct value. Found by accident while reviewing a patch to nearby code.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@141816 91177308-0d34-0410-b5e6-96231b3b80d8
2011-10-12 21:51:36 +00:00
Matt Beaumont-Gay
9d74909378 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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138745 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-29 17:54:20 +00:00
Jeffrey Yasskin
3d42bfbbdd Add an APFloat::convertToInt(APSInt) function that automatically manages the
memory for the result.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135259 91177308-0d34-0410-b5e6-96231b3b80d8
2011-07-15 07:04:56 +00:00
Benjamin Kramer
8398512f89 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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128555 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-30 17:02:54 +00:00
Benjamin Kramer
2746000f4f 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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128545 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-30 15:42:27 +00:00
Jeffrey Yasskin
b5f59f5cf0 Fix death tests in -Asserts builds.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98701 91177308-0d34-0410-b5e6-96231b3b80d8
2010-03-17 01:18:45 +00:00
John McCall
e12b73816b 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.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97364 91177308-0d34-0410-b5e6-96231b3b80d8
2010-02-28 02:51:25 +00:00
John McCall
8b3f3307a2 Make APFloat's string-parsing routines a bit safer against very large exponents.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97278 91177308-0d34-0410-b5e6-96231b3b80d8
2010-02-26 22:20:41 +00:00
John McCall
281d051921 Make APInt::countLeadingZerosSlowCase() treat the contents of padding bits
as undefined.  Fixes an assertion in APFloat::toString noticed by Dale.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95196 91177308-0d34-0410-b5e6-96231b3b80d8
2010-02-03 03:42:44 +00:00
John McCall
6a09affdf6 Implement support for converting to string at "natural precision", and fix some
major bugs in long-precision conversion.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92150 91177308-0d34-0410-b5e6-96231b3b80d8
2009-12-24 23:18:09 +00:00
John McCall
00e65de9d8 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.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92126 91177308-0d34-0410-b5e6-96231b3b80d8
2009-12-24 08:56:26 +00:00
Daniel Dunbar
83fecfa42c Add test for PR4873, which works for me.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@80965 91177308-0d34-0410-b5e6-96231b3b80d8
2009-09-03 22:57:02 +00:00
Erick Tryzelaar
c78b33bdc1 Add support for including '+' in APFloat strings, more asserts,
and many new unit tests.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79574 91177308-0d34-0410-b5e6-96231b3b80d8
2009-08-20 23:30:43 +00:00
Daniel Dunbar
cdd93d8c35 Fix two APFloat bugs in converting hexadecimal constants.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79540 91177308-0d34-0410-b5e6-96231b3b80d8
2009-08-20 17:12:33 +00:00
Erick Tryzelaar
2ad40a3663 Wrap unit test death tests in GTEST_HAS_DEATH_TEST
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79218 91177308-0d34-0410-b5e6-96231b3b80d8
2009-08-17 00:55:33 +00:00
Erick Tryzelaar
33d7dd6dc8 Change APFloatTest from using ASSERTs to EXPECTs
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79216 91177308-0d34-0410-b5e6-96231b3b80d8
2009-08-17 00:14:11 +00:00
Erick Tryzelaar
a15d890c34 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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79210 91177308-0d34-0410-b5e6-96231b3b80d8
2009-08-16 23:36:19 +00:00