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explain why CTFE/Miri perform truncation on shift offset #91162

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Merged
merged 2 commits into from
Nov 25, 2021

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RalfJung
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Some changes occured to the CTFE / Miri engine

cc @rust-lang/miri

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r? @nagisa

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@rust-highfive rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Nov 23, 2021
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oli-obk commented Nov 23, 2021

Please also throw a comment on the mir binop stating that this op masks the rhs.

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oli-obk commented Nov 24, 2021

@bors r+

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bors commented Nov 24, 2021

📌 Commit 5f6ccf6 has been approved by oli-obk

@bors bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Nov 24, 2021
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oli-obk commented Nov 24, 2021

@bors rollup

r? @oli-obk

@rust-highfive rust-highfive assigned oli-obk and unassigned nagisa Nov 24, 2021
GuillaumeGomez added a commit to GuillaumeGomez/rust that referenced this pull request Nov 24, 2021
…li-obk

explain why CTFE/Miri perform truncation on shift offset

Closes rust-lang/miri#1920
@camelid camelid added the T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. label Nov 25, 2021
matthiaskrgr added a commit to matthiaskrgr/rust that referenced this pull request Nov 25, 2021
…li-obk

explain why CTFE/Miri perform truncation on shift offset

Closes rust-lang/miri#1920
matthiaskrgr added a commit to matthiaskrgr/rust that referenced this pull request Nov 25, 2021
…li-obk

explain why CTFE/Miri perform truncation on shift offset

Closes rust-lang/miri#1920
bors added a commit to rust-lang-ci/rust that referenced this pull request Nov 25, 2021
…askrgr

Rollup of 6 pull requests

Successful merges:

 - rust-lang#89359 (Various fixes for const_trait_impl)
 - rust-lang#90499 (Link with default MACOSX_DEPLOYMENT_TARGET if not otherwise specified.)
 - rust-lang#91096 (Print associated types on opaque `impl Trait` types)
 - rust-lang#91111 (Do not visit attributes in `ItemLowerer`.)
 - rust-lang#91162 (explain why CTFE/Miri perform truncation on shift offset)
 - rust-lang#91185 (Remove `-Z force-overflow-checks`)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup
@bors bors merged commit 5fff1d7 into rust-lang:master Nov 25, 2021
@rustbot rustbot added this to the 1.58.0 milestone Nov 25, 2021
@RalfJung RalfJung deleted the miri-shift-truncation branch November 28, 2021 03:23
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Shl/Shr should throw UB on too large shift
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