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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/ref10/fe_batchinvert.c
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@@ -1,26 +1,34 @@
#include "fe.h"
// tmp MUST != out
// tmp MUST != out or in
// in MAY == out
void fe_batchinvert(fe *out[],fe tmp[],fe * const in[], size_t num)
void fe_batchinvert(fe *out,fe *in,fe *tmp,size_t num,size_t shift)
{
fe acc;
fe tmpacc;
size_t i;
fe *inp;
fe *outp;
fe_1(acc);
inp = in;
for (i = 0;i < num;++i) {
fe_copy(tmp[i],acc);
fe_mul(acc,acc,*in[i]);
fe_mul(acc,acc,*inp);
inp = (fe *)((char *)inp + shift);
}
fe_invert(acc,acc);
i = num;
inp = (fe *)((char *)in + shift * num);
outp = (fe *)((char *)out + shift * num);
while (i--) {
fe_mul(tmpacc,acc,*in[i]);
fe_mul(*out[i],acc,tmp[i]);
inp = (fe *)((char *)inp - shift);
outp = (fe *)((char *)outp - shift);
fe_mul(tmpacc,acc,*inp);
fe_mul(*outp,acc,tmp[i]);
fe_copy(acc,tmpacc);
}
}