Matthias Braun ba7d95d425 PeepholeOptimizer: Do not replace SubregToReg(bitcast like) ...

While we can usually replace bitcast like instructions
(MachineInstr::isBitcast()) with a COPY this is not legal if any of the
users uses SUBREG_TO_REG to assert the upper bits of the result are
zero.

Differential Revision: https://reviews.llvm.org/D28474

llvm-svn: 291483

2017-01-09 21:38:17 +00:00

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