Mercurial > octave
diff src/bitfcns.cc @ 7789:82be108cc558
First attempt at single precision tyeps
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corrections to qrupdate single precision routines
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prefer demotion to single over promotion to double
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Add single precision support to log2 function
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Trivial PROJECT file update
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Cache optimized hermitian/transpose methods
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Add tests for tranpose/hermitian and ChangeLog entry for new transpose code
| author | David Bateman <dbateman@free.fr> |
|---|---|
| date | Sun, 27 Apr 2008 22:34:17 +0200 |
| parents | 0c6b4c7d7117 |
| children | b93ac0586e4b |
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--- a/src/bitfcns.cc Wed May 14 18:09:56 2008 +0200 +++ b/src/bitfcns.cc Sun Apr 27 22:34:17 2008 +0200 @@ -309,6 +309,21 @@ return static_cast<int64_t> (a) & mask; } +static int64_t +bitshift (float a, int n, int64_t mask) +{ + // In the name of bug-for-bug compatibility. + if (a < 0) + return -bitshift (-a, n, mask); + + if (n > 0) + return (static_cast<int64_t> (a) << n) & mask; + else if (n < 0) + return (static_cast<int64_t> (a) >> -n) & mask; + else + return static_cast<int64_t> (a) & mask; +} + // Note that the bitshift operators are undefined if shifted by more // bits than in the type, so we need to test for the size of the // shift.