Add bignum_{sqr,mul}_p521_neon
#130
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This adds `bignum_{sqr,mul}_p521_neon` and their proofs.
The new subroutine specs are added to specification.txt, and test as well as benchmark are updated.
Benchmark results on GV2 are:
```
bignum_mul_p521 : 135.1 ns each (var 0.2%, corr -0.01) = 7404184 ops/sec
bignum_mul_p521_neon : 115.5 ns each (var 0.3%, corr 0.00) = 8660108 ops/sec
bignum_sqr_p521 : 108.9 ns each (var 0.2%, corr 0.08) = 9184994 ops/sec
bignum_sqr_p521_neon : 78.7 ns each (var 0.3%, corr 0.06) = 12708368 ops/sec
```
jargh
approved these changes
Jun 26, 2024
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This adds
bignum_{sqr,mul}_p521_neonand their proofs.The new subroutine specs are added to specification.txt, and test as well as benchmark are updated.
Benchmark results on GV2 are:
Issue #, if available:
Description of changes:
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