Mercurial > octave-nkf
comparison 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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| 7788:45f5faba05a2 | 7789:82be108cc558 |
|---|---|
| 294 BITOP (^, "bitxor"); | 294 BITOP (^, "bitxor"); |
| 295 } | 295 } |
| 296 | 296 |
| 297 static int64_t | 297 static int64_t |
| 298 bitshift (double a, int n, int64_t mask) | 298 bitshift (double a, int n, int64_t mask) |
| 299 { | |
| 300 // In the name of bug-for-bug compatibility. | |
| 301 if (a < 0) | |
| 302 return -bitshift (-a, n, mask); | |
| 303 | |
| 304 if (n > 0) | |
| 305 return (static_cast<int64_t> (a) << n) & mask; | |
| 306 else if (n < 0) | |
| 307 return (static_cast<int64_t> (a) >> -n) & mask; | |
| 308 else | |
| 309 return static_cast<int64_t> (a) & mask; | |
| 310 } | |
| 311 | |
| 312 static int64_t | |
| 313 bitshift (float a, int n, int64_t mask) | |
| 299 { | 314 { |
| 300 // In the name of bug-for-bug compatibility. | 315 // In the name of bug-for-bug compatibility. |
| 301 if (a < 0) | 316 if (a < 0) |
| 302 return -bitshift (-a, n, mask); | 317 return -bitshift (-a, n, mask); |
| 303 | 318 |