90 lines
2.9 KiB
C
90 lines
2.9 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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#ifdef VU_EMULATE_SCALAR_ACCUMULATOR_READ
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static void VSAR(usf_state_t * state, int vd, int vs, int vt, int e)
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{
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ALIGNED short oldval[N];
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register int i;
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for (i = 0; i < N; i++)
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oldval[i] = state->VR[vs][i];
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vt = 0;
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/* Even though VT is ignored in VSAR, according to official sources as well
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* as reversing, lots of games seem to specify it as non-zero, possibly to
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* avoid register stalling or other VU hazards. Not really certain why yet.
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*/
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e ^= 0x8;
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/* Or, for exception overrides, should this be `e &= 0x7;` ?
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* Currently this code is safer because &= is less likely to catch oddities.
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* Either way, documentation shows that the switch range is 0:2, not 8:A.
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*/
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if (e > 2)
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{
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message(state, "VSAR\nInvalid mask.", 2);
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#if ARCH_MIN_ARM_NEON
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int16x8_t zero = vdupq_n_s16(0);
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vst1q_s16(VR[vd], zero);
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#else
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for (i = 0; i < N; i++)
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state->VR[vd][i] = 0x0000; /* override behavior (zilmar) */
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#endif
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}
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else
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{
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#if ARCH_MIN_ARM_NEON
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vector_copy(VR[vd], VACC[e]);
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#else
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for (i = 0; i < N; i++)
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state->VR[vd][i] = state->VACC[e][i];
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#endif
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}
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for (i = 0; i < N; i++)
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state->VACC[e][i] = oldval[i]; /* ... = VS */
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return;
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}
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#endif
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static void VSAW(usf_state_t * state, int vd, int vs, int vt, int e)
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{
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register int i;
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vs = 0; /* unused--old VSAR algorithm */
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vt = 0; /* unused but mysteriously set many times */
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if (vs | vt)
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return;
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e ^= 0x8; /* &= 7 */
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if (e > 0x2)
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{ /* branch very unlikely...never seen a game do VSAW illegally */
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message(state, "VSAW\nIllegal mask.", 2);
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#if ARCH_MIN_ARM_NEON
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int16x8_t zero = vdupq_n_s16(0);
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vst1q_s16(state->VR[vd], zero);
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#else
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for (i = 0; i < N; i++)
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state->VR[vd][i] = 0x0000; /* override behavior (zilmar) */
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return;
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#endif
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}
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vector_copy(state->VR[vd], state->VACC[e]);
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return;
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}
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