Simon Wallis 79ea83e104 [SelectionDAG] memcpy expansion of const volatile struct ignores const zero ...

In getMemcpyLoadsAndStores(), a memcpy where the source is a zero constant is expanded to a MemOp::Set instead of a MemOp::Copy, even when the memcpy is volatile.
This is incorrect.

The fix is to add a check for volatile, and expand to MemOp::Copy in the volatile case.

Reviewed By: chill

Differential Revision: https://reviews.llvm.org/D87134

2020-09-07 13:22:09 +01:00

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