miri: fix exact_div #69126
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miri: fix exact_div #69126
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Makes more sense :) |
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miri: fix exact_div Turns out `exact_div` was relying on the broken behavior of `Rem` for `int_min % -1` that was fixed in rust-lang#69002. This PR fixes `exact_div`. Inside rustc, `exact_div` is only used in a single place where the divisor is always positive (in `ptr_offset_from`), so we cannot test the fix in rustc. The Miri test suite covers this through the `exact_div` intrinsic, though (and it is how I found out). One step to rust-lang#69117 (then we also need to address build failures introduced by rust-lang#68969) r? @oli-obk
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Rollup of 9 pull requests Successful merges: - #68728 (parse: merge `fn` syntax + cleanup item parsing) - #68938 (fix lifetime shadowing check in GATs) - #69057 (expand: misc cleanups and simplifications) - #69108 (Use HirId in TraitCandidate.) - #69125 (Add comment to SGX entry code) - #69126 (miri: fix exact_div) - #69127 (Enable use after scope detection in the new LLVM pass manager) - #69135 (Spelling error "represening" to "representing") - #69141 (Don't error on network failures) Failed merges: r? @ghost
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Turns out
exact_divwas relying on the broken behavior ofRemforint_min % -1that was fixed in #69002. This PR fixesexact_div.Inside rustc,
exact_divis only used in a single place where the divisor is always positive (inptr_offset_from), so we cannot test the fix in rustc. The Miri test suite covers this through theexact_divintrinsic, though (and it is how I found out).One step to #69117 (then we also need to address build failures introduced by #68969)
r? @oli-obk