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/******************************************************************************\
* Authors: Iconoclast *
* Release: 2013.11.26 *
* License: CC0 Public Domain Dedication *
* *
* To the extent possible under law, the author(s) have dedicated all copyright *
* and related and neighboring rights to this software to the public domain *
* worldwide. This software is distributed without any warranty. *
* *
* You should have received a copy of the CC0 Public Domain Dedication along *
* with this software. *
* If not, see <http://creativecommons.org/publicdomain/zero/1.0/>. *
\******************************************************************************/
#include "vu.h"
INLINE static void set_bo(usf_state_t * state, short* VD, short* VS, short* VT)
{ /* set CARRY and borrow out from difference */
#ifdef ARCH_MIN_ARM_NEON
int16x8_t vs, vt,vaccl,ne, co2;
uint16x8_t cond;
int16x8_t zero = vdupq_n_s16(0);
int16x8_t one = vdupq_n_s16(1);
vs = vld1q_s16((const int16_t*)VS);
vt = vld1q_s16((const int16_t*)VT);
vaccl = vsubq_s16(vs, vt);
uint16x8_t vdif = vqsubq_u16((uint16x8_t)vs, (uint16x8_t)vt);
vst1q_s16(VACC_L, vaccl);
vector_copy(VD, VACC_L);
cond = vceqq_s16(vs, vt);
ne = vaddq_s16((int16x8_t)cond, one);
vdif = vorrq_u16(vdif,cond);
cond = vceqq_u16(vdif, (uint16x8_t)zero);
co2 = vnegq_s16((int16x8_t)cond);
vst1q_s16(state->ne, ne);
vst1q_s16(state->co, co2);
return;
#else
ALIGNED int32_t dif[N];
register int i;
for (i = 0; i < N; i++)
dif[i] = (unsigned short)(VS[i]) - (unsigned short)(VT[i]);
for (i = 0; i < N; i++)
VACC_L[i] = VS[i] - VT[i];
vector_copy(VD, VACC_L);
for (i = 0; i < N; i++)
state->ne[i] = (VS[i] != VT[i]);
for (i = 0; i < N; i++)
state->co[i] = (dif[i] < 0);
return;
#endif
}
static void VSUBC(usf_state_t * state, int vd, int vs, int vt, int e)
{
ALIGNED short ST[N];
SHUFFLE_VECTOR(ST, state->VR[vt], e);
set_bo(state, state->VR[vd], state->VR[vs], ST);
return;
}