| commit | 840e329bc483c28948989047de8523b7386131ed | [log] [tgz] |
|---|---|---|
| author | Rupert Swarbrick <rswarbrick@lowrisc.org> | Fri Oct 02 08:43:18 2020 +0100 |
| committer | Rupert Swarbrick <rswarbrick@gmail.com> | Fri Oct 02 10:15:13 2020 +0100 |
| tree | 64d589f4b4f28cd4cdd892d5b45d6878c5f28db0 | |
| parent | cfd6d4181b92ab99d3a6024a76a8a2546aebfb74 [diff] |
[otbn] Fix rounding in bn.addm in ISS The add_with_carry function truncates its result to 256 bits, which is what you normally want, but isn't what you want for BN.ADDM, where you might overflow but then fix it by subtracting MOD. I've updated the documentation to match. This now matches the RTL. Signed-off-by: Rupert Swarbrick <rswarbrick@lowrisc.org>
OpenTitan is an open source silicon Root of Trust (RoT) project. OpenTitan will make the silicon RoT design and implementation more transparent, trustworthy, and secure for enterprises, platform providers, and chip manufacturers. OpenTitan is administered by lowRISC CIC as a collaborative project to produce high quality, open IP for instantiation as a full-featured product. See the OpenTitan site and OpenTitan docs for more information about the project.
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