Wasmtime GitHub notifications bot (Dec 16 2021 at 19:38): Wasmtime GitHub notifications bot (Dec 16 2021 at 19:38):cfallin opened PR #3610 from fix-narrow-type-rotate to main:
Uncovered by @bjorn3 (thanks!): 8- and 16-bit rotates were not working
properly in recent versions of Cranelift with part of the lowering
migrated to ISLE.This PR fixes a few issues:
8- and 16-bit rotate-left needs to mask a constant amount, if any,
because we use a 32-bit rotate instruction and so don't get the
appropriate shift-amount masking for free from x86 semantics.
operand_size_from_typewas incorrect: it only handled 32- and 64-bit
types and silently returnedOperandSize::Size32for everything else.
Now uses theOperandSize::from_ty(ty)helper as the pre-ISLE code
did.Our test coverage for narrow value types is not great; this PR adds some
runtests for rotl/rotr but more would always be better!<!--
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Wasmtime GitHub notifications bot (Dec 16 2021 at 19:38):cfallin requested alexcrichton for a review on PR #3610.
Wasmtime GitHub notifications bot (Dec 16 2021 at 20:00):alexcrichton submitted PR review.
Wasmtime GitHub notifications bot (Dec 16 2021 at 20:34):cfallin updated PR #3610 from fix-narrow-type-rotate to main.
Wasmtime GitHub notifications bot (Dec 16 2021 at 22:06):cfallin merged PR #3610.
Last updated: Oct 23 2024 at 20:03 UTC