Function rustc_ap_rustc_target::asm::allocatable_registers

pub fn allocatable_registers(
    arch: InlineAsmArch, 
    has_feature: impl FnMut(&str) -> bool
) -> FxHashMap<InlineAsmRegClass, FxHashSet<InlineAsmReg>>

Returns the full set of allocatable registers for a given architecture.

The registers are structured as a map containing the set of allocatable registers in each register class. A particular register may be allocatable from multiple register classes, in which case it will appear multiple times in the map.