Matt Arsenault 5630e3a1c7 RegUsageInfoCollector: Don't iterate all regs for every reg class ...

This is extremly slow on AMDGPU, which has a lot of physical register
and a lot of register classes.

determineCalleeSaves, via MachineRegisterInfo::isPhysRegUsed already
added all of the super registers to the saved set.

llvm-svn: 365370

2019-07-08 18:48:42 +00:00

7.0 KiB

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