[40.0.x] Backport a few codegen fixes #12345
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Add some more `fits_in_64` constraints to types to handle the fact that `iconst_u` can't construct a 128-bit output. Closes bytecodealliance#12170
* x64: Fix lowering rules for `shld` These failed to account for the edge case of 0/width(type) shifts where the `shld` instruction is no longer applicable. Guards are added to ensure that the shift amounts are both greater than zero. This in theory shouldn't have much practical impact since shift-by-zero and shift-by-type-width are both optimized away in the mid-end. That means that this is only possible to expose with opt-level=0 which may help explain why this went undiscovered for ~1 year. Closes bytecodealliance#12318 * Fix Winch's encoding of shift-by-32
cfallin
approved these changes
Jan 14, 2026
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This is a backport of #12179, #12321, and #12335 to the 40.0.x release branch to push out a few more fixes with today's point release to cover #12333 as well.