60 lines
1.7 KiB
C
60 lines
1.7 KiB
C
/*
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DingusPPC - The Experimental PowerPC Macintosh emulator
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Copyright (C) 2018-23 divingkatae and maximum
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(theweirdo) spatium
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(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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/** Non-standard low-level bitwise operations. */
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#ifndef BIT_OPS_H
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#define BIT_OPS_H
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#if defined(__GNUG__) && !defined(__clang__) // GCC, mybe ICC but not Clang
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# include <x86intrin.h>
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# define ROTL_32(x, n) (_rotl((x), (n)))
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# define ROTR_32(x, n) (_rotr((x), (n)))
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#elif defined(_MSC_VER) // MSVC
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# include <intrin.h>
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# define ROTL_32(x, n) (_rotl((x), (n)))
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# define ROTR_32(x, n) (_rotr((x), (n)))
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#else
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// cyclic rotation idioms that modern compilers will
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// recognize and generate very compact code for
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// evolving specific machine instructions
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inline unsigned ROTL_32(unsigned x, unsigned n) {
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n &= 0x1F;
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return (x << n) | (x >> (32 - n));
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}
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inline unsigned ROTR_32(unsigned x, unsigned n) {
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n &= 0x1F;
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return (x >> n) | (x << (32 - n));
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}
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#endif
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#endif // BIT_OPS_H
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