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copy_bar
2020 Feb 22
2
COPYs between register classes
Hi,
On SystemZ there are a set of "access registers" that can be copied in
and out of 32-bit GPRs with special instructions. These instructions can
only perform the copy using low 32-bit parts of the 64-bit GPRs. As
reported and discussed at https://bugs.llvm.org/show_bug.cgi?id=44254,
this is currently broken due to the fact that the default register class
for 32-bit integers is