Stream: git-wasmtime

Topic: wasmtime / issue #1385 Re-design constant pools

Wasmtime GitHub notifications bot (Sep 24 2026 at 16:36):

fitzgen closed issue #1385:

This is an open-ended issue for re-designing Cranelift's constant pools. In #1377 I added the ability to calculate the address of constants using const_addr and to declare constants in function preambles (e..g const42 = [0 1 2...]). Constant pools are still implemented at the function level, though, so there is no coalescing of constant values across functions.

I added the function-level ConstantPool implementation in order to support SIMD constants (which don't fit in the immediate fields of Cranelift's IR). This is not a pressing issue yet, but before other components start using constants, it might be good to discuss:

• should we implement constant pools at the global level and what would this look like?
• what should the relocation hooks look like for a more general constant pool implementation? Currently the interface looks like RelocSink::reloc_constant(&mut self, CodeOffset, Reloc, ConstantOffset) and this may need to change.

Wasmtime GitHub notifications bot (Sep 24 2026 at 16:36):

fitzgen commented on issue #1385:

We've implemented per-function constant pools, and have a separate issue for using .rodata, which can track the coalescing half of this issue's original purpose. So closing this issue.

Last updated: Oct 11 2026 at 02:20 UTC