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Summary: MachineRegisterInfo::constrainRegClass() can fail if two register classes don't have a common subclass or if the register class doesn't contain enough registers. Check the return value before trying to remove Phi nodes, and if we can't constrain, we output a COPY instead of simply replacing registers. Reviewers: kparzysz, david2050, wmi Reviewed By: kparzysz Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D32999 llvm-svn: 302622 |
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llvm.spec.in | ||
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