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dont do indirection in for batch stuff

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cathugger
2020-11-22 10:21:06 +00:00
parent 5b5f414b79
commit 51d87c3857
19 changed files with 86 additions and 71 deletions
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18
ed25519/amd64-51-30k/fe25519_batchinvert.c
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@@ -1,26 +1,34 @@
#include "fe25519.h"
// tmp MUST != out
// tmp MUST != out or in
// in MAY == out
void fe25519_batchinvert(fe25519 *out[],fe25519 tmp[],fe25519 * const in[], size_t num)
void fe25519_batchinvert(fe25519 *out, const fe25519 *in, fe25519 *tmp, size_t num, size_t offset)
{
fe25519 acc;
fe25519 tmpacc;
size_t i;
const fe25519 *inp;
fe25519 *outp;
fe25519_setint(&acc,1);
inp = in;
for (i = 0;i < num;++i) {
tmp[i] = acc;
fe25519_mul(&acc,&acc,in[i]);
fe25519_mul(&acc,&acc,inp);
inp = (const fe25519 *)((const char *)inp + offset);
}
fe25519_invert(&acc,&acc);
i = num;
inp = (const fe25519 *)((const char *)in + offset * num);
outp = (fe25519 *)((char *)out + offset * num);
while (i--) {
fe25519_mul(&tmpacc,&acc,in[i]);
fe25519_mul(out[i],&acc,&tmp[i]);
inp = (const fe25519 *)((const char *)inp - offset);
outp = (fe25519 *)((char *)outp - offset);
fe25519_mul(&tmpacc,&acc,inp);
fe25519_mul(outp,&acc,&tmp[i]);
acc = tmpacc;
}
}