[LLVMdev] Possible fix for Bug 1388 - CPY instruction emitted on < ARMv6T

[Jakob Stoklund Olesen]

On Jan 10, 2012, at 3:57 PM, Jim Grosbach wrote:

> The register allocator expects to be able to insert a copy instruction w/o side-effects, though, and not having one can potentially cause problems. Jakob would be able to more specifically comment on what's required there.

That's right. The register allocator will insert copies and spill/fill instructions anywhere it feels like it.

It might be an option to simply bundle the CPSR def and use instructions, so CPSR is never live outside a bundle.

/jakob