f489b83835
This PR adds a flag to each block that can be set via the frontend/builder interface that indicates that the block will not be frequently executed. As such, the compiler backend should place the block "out of line" in the final machine code, so that the ordinary, more frequent execution path that excludes the block does not have to jump around it. This is useful for adding handlers for exceptional conditions (slow-paths, guard violations) in a way that minimizes performance cost. Fixes #2747.
This crate provides a straightforward way to create a
Cranelift IR function and fill it with
instructions translated from another language. It contains an SSA construction
module that provides convenient methods for translating non-SSA variables into
SSA Cranelift IR values via use_var and def_var calls.