56 lines
2.1 KiB
C
56 lines
2.1 KiB
C
/******************************************************************************\
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* Authors: Iconoclast *
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* Release: 2013.11.26 *
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* License: CC0 Public Domain Dedication *
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* *
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* To the extent possible under law, the author(s) have dedicated all copyright *
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* and related and neighboring rights to this software to the public domain *
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* worldwide. This software is distributed without any warranty. *
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* *
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* You should have received a copy of the CC0 Public Domain Dedication along *
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* with this software. *
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* If not, see <http://creativecommons.org/publicdomain/zero/1.0/>. *
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\******************************************************************************/
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#include "vu.h"
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#ifndef SEMIFRAC
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/*
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* acc = VS * VT;
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* acc = acc + 0x8000; // rounding value
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* acc = acc << 1; // partial value shifting
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*
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* Wrong: ACC(HI) = -((INT32)(acc) < 0)
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* Right: ACC(HI) = -(SEMIFRAC < 0)
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*/
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#define SEMIFRAC (VS[i]*VT[i]*2/2 + 0x8000/2)
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#endif
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INLINE static void do_mulf(usf_state_t * state, short* VD, short* VS, short* VT)
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{
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register int i;
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for (i = 0; i < N; i++)
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VACC_L[i] = (SEMIFRAC << 1) >> 0;
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for (i = 0; i < N; i++)
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VACC_M[i] = (SEMIFRAC << 1) >> 16;
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for (i = 0; i < N; i++)
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VACC_H[i] = -((VACC_M[i] < 0) & (VS[i] != VT[i])); /* -32768 * -32768 */
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#ifndef ARCH_MIN_SSE2
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vector_copy(VD, VACC_M);
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for (i = 0; i < N; i++)
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VD[i] -= (VACC_M[i] < 0) & (VS[i] == VT[i]); /* ACC b 31 set, min*min */
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#else
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SIGNED_CLAMP_AM(state, VD);
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#endif
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return;
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}
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static void VMULF(usf_state_t * state, int vd, int vs, int vt, int e)
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{
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ALIGNED short ST[N];
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SHUFFLE_VECTOR(ST, state->VR[vt], e);
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do_mulf(state, state->VR[vd], state->VR[vs], ST);
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return;
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}
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