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Last change
on this file since 603 was 2, checked in by bird, 23 years ago |
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Initial revision
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-
Property cvs2svn:cvs-rev
set to
1.1
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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:
1.1 KB
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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 | #ifdef KR_headers
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| 13 | qbit_bits(a, b, len) longint a; integer b, len;
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| 14 | #else
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| 15 | qbit_bits(longint a, integer b, integer len)
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| 16 | #endif
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| 17 | {
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| 18 | /* Assume 2's complement arithmetic */
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| 19 |
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| 20 | ulongint x, y;
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| 21 |
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| 22 | x = (ulongint) a;
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| 23 | y = (ulongint)-1L;
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| 24 | x >>= b;
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| 25 | y <<= len;
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| 26 | return (longint)(x & y);
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| 27 | }
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| 28 |
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| 29 | longint
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| 30 | #ifdef KR_headers
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| 31 | qbit_cshift(a, b, len) longint a; integer b, len;
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| 32 | #else
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| 33 | qbit_cshift(longint a, integer b, integer len)
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| 34 | #endif
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| 35 | {
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| 36 | ulongint x, y, z;
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| 37 |
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| 38 | x = (ulongint)a;
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| 39 | if (len <= 0) {
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| 40 | if (len == 0)
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| 41 | return 0;
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| 42 | goto full_len;
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| 43 | }
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| 44 | if (len >= LONG8BITS) {
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| 45 | full_len:
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| 46 | if (b >= 0) {
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| 47 | b %= LONG8BITS;
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| 48 | return (longint)(x << b | x >> LONG8BITS - b );
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| 49 | }
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| 50 | b = -b;
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| 51 | b %= LONG8BITS;
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| 52 | return (longint)(x << LONG8BITS - b | x >> b);
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| 53 | }
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| 54 | y = z = (unsigned long)-1;
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| 55 | y <<= len;
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| 56 | z &= ~y;
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| 57 | y &= x;
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| 58 | x &= z;
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| 59 | if (b >= 0) {
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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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| 63 | b = -b;
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| 64 | b %= len;
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| 65 | return (longint)(y | z & (x >> b | x << len - b));
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| 66 | }
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