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Last change
on this file was 1392, checked in by bird, 21 years ago |
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This commit was generated by cvs2svn to compensate for changes in r1391,
which included commits to RCS files with non-trunk default branches.
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Property cvs2svn:cvs-rev
set to
1.1.1.2
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Property svn:eol-style
set to
native
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Property svn:executable
set to
*
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File size:
1011 bytes
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| 1 | #include "f2c.h"
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| 2 |
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| 3 | #ifndef LONGBITS
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| 4 | #define LONGBITS 32
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| 5 | #endif
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| 6 |
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| 7 | #ifndef LONG8BITS
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| 8 | #define LONG8BITS (2*LONGBITS)
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| 9 | #endif
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| 10 |
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| 11 | integer
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| 12 | qbit_bits (longint a, integer b, integer len)
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| 13 | {
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| 14 | /* Assume 2's complement arithmetic */
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| 15 |
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| 16 | ulongint x, y;
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| 17 |
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| 18 | x = (ulongint) a;
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| 19 | y = (ulongint) - 1L;
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| 20 | x >>= b;
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| 21 | y <<= len;
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| 22 | return (longint) (x & y);
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| 23 | }
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| 24 |
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| 25 | longint
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| 26 | qbit_cshift (longint a, integer b, integer len)
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| 27 | {
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| 28 | ulongint x, y, z;
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| 29 |
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| 30 | x = (ulongint) a;
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| 31 | if (len <= 0)
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| 32 | {
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| 33 | if (len == 0)
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| 34 | return 0;
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| 35 | goto full_len;
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| 36 | }
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| 37 | if (len >= LONG8BITS)
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| 38 | {
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| 39 | full_len:
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| 40 | if (b >= 0)
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| 41 | {
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| 42 | b %= LONG8BITS;
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| 43 | return (longint) (x << b | x >> (LONG8BITS - b));
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| 44 | }
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| 45 | b = -b;
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| 46 | b %= LONG8BITS;
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| 47 | return (longint) (x << (LONG8BITS - b) | x >> b);
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| 48 | }
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| 49 | y = z = (unsigned long) -1;
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| 50 | y <<= len;
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| 51 | z &= ~y;
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| 52 | y &= x;
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| 53 | x &= z;
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| 54 | if (b >= 0)
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| 55 | {
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| 56 | b %= len;
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| 57 | return (longint) (y | (z & (x << b | x >> (len - b))));
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| 58 | }
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| 59 | b = -b;
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| 60 | b %= len;
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| 61 | return (longint) (y | (z & (x >> b | x << (len - b))));
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| 62 | }
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