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[SelectionDAG] memcpy expansion of const volatile struct ignores const zero

Authored by simonwallis2 on Sep 4 2020, 3:38 AM.



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.

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simonwallis2 created this revision.Sep 4 2020, 3:38 AM
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simonwallis2 requested review of this revision.Sep 4 2020, 3:38 AM
chill accepted this revision.Sep 7 2020, 3:34 AM
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This revision is now accepted and ready to land.Sep 7 2020, 3:34 AM