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https://github.com/ClassiCube/ClassiCube.git
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57 lines
1.7 KiB
C
57 lines
1.7 KiB
C
/*
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* Copyright (c) 2016 Thomas Pornin <pornin@bolet.org>
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "inner.h"
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/* see inner.h */
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uint32_t
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br_divrem(uint32_t hi, uint32_t lo, uint32_t d, uint32_t *r)
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{
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/* TODO: optimize this */
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uint32_t q;
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uint32_t ch, cf;
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int k;
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q = 0;
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ch = EQ(hi, d);
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hi = MUX(ch, 0, hi);
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for (k = 31; k > 0; k --) {
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int j;
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uint32_t w, ctl, hi2, lo2;
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j = 32 - k;
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w = (hi << j) | (lo >> k);
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ctl = GE(w, d) | (hi >> k);
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hi2 = (w - d) >> j;
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lo2 = lo - (d << k);
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hi = MUX(ctl, hi2, hi);
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lo = MUX(ctl, lo2, lo);
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q |= ctl << k;
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}
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cf = GE(lo, d) | hi;
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q |= cf;
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*r = MUX(cf, lo - d, lo);
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return q;
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}
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