feat: BitVec.msb_sdiv #8178
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feat: BitVec.msb_sdiv #8178
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In this PR, we add lemmas for `msb_sdiv`. This needs quite a bit of analysis on `Int.tdiv`, and we develop the theory of `Int.tdiv` to enable proving `msb_sdiv`. The salient points are as follows: - First, sdiv equals tdiv.
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Mathlib CI status (docs):
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luisacicolini
approved these changes
May 12, 2025
Co-authored-by: Luisa Cicolini <48860705+luisacicolini@users.noreply.github.com>
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tobiasgrosser
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Jun 17, 2025
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Thank you @bollu. Modulo the last comments, this looks good to me.
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changelog-library |
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@tobiasgrosser all comments addressed. |
wkrozowski
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Jun 24, 2025
This PR provides a compact formula for the MSB of the sdiv. Most of the work in the PR involves handling the corner cases of division overflowing (e.g. `intMin / -1 = intMin`) --------- Co-authored-by: Luisa Cicolini <48860705+luisacicolini@users.noreply.github.com> Co-authored-by: Tobias Grosser <github@grosser.es>
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This PR provides a compact formula for the MSB of the sdiv. Most of the work in the PR involves handling the corner cases of division overflowing (e.g.
intMin / -1 = intMin)