93 lines
5.6 KiB
C
93 lines
5.6 KiB
C
/**************************************************************************/
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/* */
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/* OCaml */
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/* */
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/* Xavier Leroy, projet Cristal, INRIA Rocquencourt */
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/* */
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/* Copyright 1996 Institut National de Recherche en Informatique et */
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/* en Automatique. */
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/* */
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/* All rights reserved. This file is distributed under the terms of */
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/* the GNU Lesser General Public License version 2.1, with the */
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/* special exception on linking described in the file LICENSE. */
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/* */
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/**************************************************************************/
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/* Swap byte-order in 16, 32, and 64-bit integers or floats */
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#ifndef CAML_REVERSE_H
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#define CAML_REVERSE_H
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#ifdef CAML_INTERNALS
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#define Reverse_16(dst,src) { \
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char * _p, * _q; \
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char _a; \
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_p = (char *) (src); \
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_q = (char *) (dst); \
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_a = _p[0]; \
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_q[0] = _p[1]; \
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_q[1] = _a; \
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}
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#define Reverse_32(dst,src) { \
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char * _p, * _q; \
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char _a, _b; \
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_p = (char *) (src); \
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_q = (char *) (dst); \
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_a = _p[0]; \
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_b = _p[1]; \
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_q[0] = _p[3]; \
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_q[1] = _p[2]; \
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_q[3] = _a; \
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_q[2] = _b; \
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}
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#define Reverse_64(dst,src) { \
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char * _p, * _q; \
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char _a, _b; \
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_p = (char *) (src); \
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_q = (char *) (dst); \
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_a = _p[0]; \
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_b = _p[1]; \
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_q[0] = _p[7]; \
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_q[1] = _p[6]; \
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_q[7] = _a; \
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_q[6] = _b; \
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_a = _p[2]; \
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_b = _p[3]; \
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_q[2] = _p[5]; \
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_q[3] = _p[4]; \
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_q[5] = _a; \
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_q[4] = _b; \
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}
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#define Perm_index(perm,i) ((perm >> (i * 4)) & 0xF)
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#define Permute_64(dst,perm_dst,src,perm_src) { \
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char * _p; \
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char _a, _b, _c, _d, _e, _f, _g, _h; \
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_p = (char *) (src); \
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_a = _p[Perm_index(perm_src, 0)]; \
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_b = _p[Perm_index(perm_src, 1)]; \
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_c = _p[Perm_index(perm_src, 2)]; \
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_d = _p[Perm_index(perm_src, 3)]; \
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_e = _p[Perm_index(perm_src, 4)]; \
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_f = _p[Perm_index(perm_src, 5)]; \
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_g = _p[Perm_index(perm_src, 6)]; \
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_h = _p[Perm_index(perm_src, 7)]; \
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_p = (char *) (dst); \
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_p[Perm_index(perm_dst, 0)] = _a; \
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_p[Perm_index(perm_dst, 1)] = _b; \
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_p[Perm_index(perm_dst, 2)] = _c; \
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_p[Perm_index(perm_dst, 3)] = _d; \
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_p[Perm_index(perm_dst, 4)] = _e; \
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_p[Perm_index(perm_dst, 5)] = _f; \
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_p[Perm_index(perm_dst, 6)] = _g; \
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_p[Perm_index(perm_dst, 7)] = _h; \
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}
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#endif /* CAML_INTERNALS */
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#endif /* CAML_REVERSE_H */
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