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fr64
2017 Jul 28
3
Purpose of various register classes in X86 target
Hello Matthias,
On 28 July 2017 at 04:13, Matthias Braun <mbraun at apple.com> wrote:
> It's not that hard in principle:
> - A register class is a set of registers.
> - Virtual Registers have a register class assigned.
> - If you have register constraints (like x86 8bit operations only work on
> al,ah,etc.) then you have to create a new register class to express that.