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mirror of https://github.com/ARMmbed/mbedtls.git synced 2025-06-05 14:26:42 +08:00
Gabor Mezei 73e8553273
Add comments to illustrate the second round of carry reduction is unnecessary
The first round of carry reduction can not generate a carry thus the
secound round is not needed. The comments illustrating when the
carry is 1. The reduction is simmetric so the case when the carry is
-1 is similar.
The illustration is trying to calculate the input value starting with
setting the carry to 1 before the second round of the carry reduction.
It calculates backwords and tries to determine the value range of
each word. It ends up with a contradiction that A10 must have the
value of 0 and UINT32_MAX.

Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
2023-02-27 16:32:42 +01:00
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