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/* Copyright (c) 2014-2016 Cryptography Research, Inc.
* Released under the MIT License. See LICENSE.txt for license information.
*/
#define GF_HEADROOM 2
#define LIMBPERM(x) (((x)<<1 | (x)>>3) & 15)
#define USE_NEON_PERM 1
#define LIMBHI(x) ((x##ull)>>28)
#define LIMBLO(x) ((x##ull)&((1ull<<28)-1))
# define FIELD_LITERAL(a,b,c,d,e,f,g,h) \
{{LIMBLO(a),LIMBLO(e), LIMBHI(a),LIMBHI(e), \
LIMBLO(b),LIMBLO(f), LIMBHI(b),LIMBHI(f), \
LIMBLO(c),LIMBLO(g), LIMBHI(c),LIMBHI(g), \
LIMBLO(d),LIMBLO(h), LIMBHI(d),LIMBHI(h)}}
#define LIMB_PLACE_VALUE(i) 28
void gf_add_RAW (gf out, const gf a, const gf b) {
for (unsigned int i=0; i<sizeof(*out)/sizeof(uint32xn_t); i++) {
((uint32xn_t*)out)[i] = ((const uint32xn_t*)a)[i] + ((const uint32xn_t*)b)[i];
}
}
void gf_sub_RAW (gf out, const gf a, const gf b) {
for (unsigned int i=0; i<sizeof(*out)/sizeof(uint32xn_t); i++) {
((uint32xn_t*)out)[i] = ((const uint32xn_t*)a)[i] - ((const uint32xn_t*)b)[i];
}
/*
unsigned int i;
for (i=0; i<sizeof(*out)/sizeof(out->limb[0]); i++) {
out->limb[i] = a->limb[i] - b->limb[i];
}
*/
}
void gf_bias (gf a, int amt) {
uint32_t co1 = ((1ull<<28)-1)*amt, co2 = co1-amt;
uint32x4_t lo = {co1,co2,co1,co1}, hi = {co1,co1,co1,co1};
uint32x4_t *aa = (uint32x4_t*) a;
aa[0] += lo;
aa[1] += hi;
aa[2] += hi;
aa[3] += hi;
}
void gf_weak_reduce (gf a) {
uint32x2_t *aa = (uint32x2_t*) a, vmask = {(1ull<<28)-1, (1ull<<28)-1}, vm2 = {0,-1},
tmp = vshr_n_u32(aa[7],28);
for (unsigned int i=7; i>=1; i--) {
aa[i] = vsra_n_u32(aa[i] & vmask, aa[i-1], 28);
}
aa[0] = (aa[0] & vmask) + vrev64_u32(tmp) + (tmp&vm2);
}
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