| 9666c57ab247046b716e9c1e56f0dcc7d4a1545f |
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20-Jun-2015 |
Hans Boehm <hboehm@google.com> |
Replace errors by unchecked exceptions
Bug: 20667245
Also makes the exception classes local to CR, consistent with 21st
century programming style.
Change-Id: Iea7956715d8942fa87c6cd68fb6a9ca11ea73b89
/external/crcalc/src/com/hp/creals/UnaryCRFunction.java
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| b849a8eb275670d2bd9b2dc535231cf333414f5e |
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21-May-2015 |
Hans Boehm <hboehm@google.com> |
Add explicit asin() computation.
Bug: 20729963
Bug: 20480098
Add Taylor-series-based asin() and straightforward acos().
Add tests for the above. We check the new implementation against
the old one, among other things.
Add public ZERO and ONE constants.
Although it's much less elegant, this is significantly faster than
the old inverse(sin) computation. It seems to reduce typical arcsin
computations from small numbers of 100s of msecs to small numbers of
10s of milliseconds. That's still not exactly speedy, but should
be fast enough.
This has the added benefit that the Taylor series computation should
be easily amenable to odd-/even-terms parallelization, if we want more
performance. That's not implemented yet.
The copyright change came from dannyb.
Change-Id: Iedc4ba2d94cd8fdd92cf86d1eb24cc4b273b41f6
/external/crcalc/src/com/hp/creals/UnaryCRFunction.java
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| a8e45a3255089266ccf6500188a2d31af8634e4a |
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25-Feb-2015 |
Hans Boehm <hboehm@google.com> |
Fix cos() prescaling, clean up inverse, add tests
Cosine arguments close to pi were not correctly prescaled, resulting
in a significantly more expensive computation.
The choice of binary search vs interpolation in the inverse function
algorithm was somewhat random, in that it sometimes counted binary
search steps as "successful" and sometimes not. This caused more binary
search steps than intended, which unfortunately sometimes improved matters.
This fixes the unpredictability and adjust the heuristics to get
performance on tan(atan(large)) back to roughly where we started.
Increase precision a bit more aggressively in the inverse function to
potentially allow superlinear convergence in more cases. I couldn't
reconstruct any meaningful rationale for the old formula.
Add SlowCRTest. Reorganize and fix tests to be consistent with Android
guidelines, more or less. Update COPYRIGHT.txt to reflect the fact
that we own SlowCRTest.
Change-Id: I8e2d3d11672ddfe24fd8ad0c74d05ef11b12cb03
/external/crcalc/src/com/hp/creals/UnaryCRFunction.java
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| 7b2383f4d4d94a6dd29a1f1ac581abf852875fca |
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27-Nov-2014 |
Hans Boehm <hboehm@google.com> |
Some Google improvements from unreleased KitKat CRCalculator
- Add string arguments to exceptions.
- Add basic synchronization for multithreaded use.
- Improve cos() prescaling to keep expression tree depth constant,
independent of argument size.
- Modify TestCR.java for better junit compatibility.
Change-Id: Ib7aa581425f10bdcb43b276d401dc3e285c802be
/external/crcalc/src/com/hp/creals/UnaryCRFunction.java
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| 6db978c639e9bd5ac63fd88cbf3765d8c0fb3271 |
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27-Nov-2014 |
Hans Boehm <hboehm@google.com> |
Rename com/sgi to hp/creals
to reflect the latest upstream convention.
Change-Id: I5f49c073342c3bb0953da8bef2908dc289ddebec
/external/crcalc/src/com/hp/creals/UnaryCRFunction.java
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