Function lower_function 

pub fn lower_function(func: &Function) -> Result<LoweredFunction, LoweringError>

Lower a complete Cranelift cl::Function to a LoweredFunction.

Walks the function in layout order, dispatches each instruction through the wave-1 per-family lowerers (arith → float → memory → cf → vector → conv), and assembles the resulting LoweredOps into per-block LoweredBlocks.

Errors

• LoweringError::UnsupportedOpcode when no wave-1 family matches an instruction. (Signature errors are also surfaced via this variant pending the W2.10 LoweringError::Signature(#[from] ...) follow-up; they carry the signature error’s Display text in the op field.)
• LoweringError::UnsupportedType when a memory-family op references a Cranelift type crate::lowered_ir::LoweredType cannot model.
• LoweringError::UndefinedValue when a memory-family op references a Cranelift Value not yet in the value-map (driver bug or ill-formed input function).

Notes

Block parameters of non-entry blocks are also seeded into the value-map up front — the wave-1 cf lowerings translate BlockCall args using the value map of the call site, but a downstream consumer that uses a block param as an operand needs that param to be in the map before its block is walked. We allocate ids for every block param in layout order before walking instructions.