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Stuart Cook
df44e396c0
x86: reserve `bl` and `bh` registers to match `rbx` `bl` and `bh` need to be explicitly marked as reserved, as they are sub-registers of `rbx`, which is reserved by LLVM. Discovered this while trying to run Graviola through Cranelift, which was becoming corrupted due to the register allocator assigning `bl`: https://github.com/rust-lang/rustc_codegen_cranelift/pull/1629 cc: @bjorn3
rustc_target contains some very low-level details that are
specific to different compilation targets and so forth.
For more information about how rustc works, see the rustc dev guide.