Veera fb0a3a8e9e

[MemCpyOptimizer] Prevent Merging a Store Into Memset of an undef (#181609) ...

MemCopyOptimizer was merging a store instruction into a memset of an
`undef` value and emitted a large memset for the memset and store
combined.

This PR prevents MemCopyOptimizer from merging a store instruction into
a
memset of an `undef` value since it can be removed by subsequent cleanup
passes.

Helps https://github.com/rust-lang/rust/issues/152541

2026-02-16 06:07:37 -08:00

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2008-02-24-MultipleUseofSRet.ll

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2008-03-13-ReturnSlotBitcast.ll

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2011-06-02-CallSlotOverwritten.ll

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aa-recursion-assertion-failure.ll

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aggregate-type-crash.ll

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align.ll

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atomic.ll

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byval-readnone.ll

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callslot_aa.ll

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callslot_badaa.ll

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callslot_deref.ll

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callslot_noalias.ll

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callslot_throw.ll

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callslot.ll

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capturing-func.ll

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crash.ll

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fca2memcpy.ll

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form-memset.ll

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invariant.start.ll

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lifetime-missing.ll

[MemCpyOpt] Extend performMemCpyToMemSetOptzn to partially memset'd region

2026-01-30 10:09:08 +01:00

lifetime.ll

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load-store-to-memcpy.ll

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loadstore-sret.ll

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memcpy-byval-forwarding-clobbers.ll

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memcpy-gep-modification.ll

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memcpy-in-loop.ll

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memcpy-invoke-memcpy.ll

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memcpy-memcpy-offset.ll

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memcpy-tbaa.ll

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memcpy-to-memset-with-lifetimes.ll

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memcpy-to-memset.ll

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memcpy-undef.ll

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memcpy-zero-size.ll

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memcpy.ll

[MemCpyOptimizer] Prevent Merging a Store Into Memset of an undef (#181609)

2026-02-16 06:07:37 -08:00

memmove.ll

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memset-memcpy-dbgloc.ll

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memset-memcpy-oversized.ll

[MemCpyOpt] Extend performMemCpyToMemSetOptzn to partially memset'd region

2026-01-30 10:09:08 +01:00

memset-memcpy-redundant-memset.ll

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memset-memcpy-to-2x-memset.ll

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memset-memmove-redundant-memmove.ll

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merge-into-memset.ll

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mixed-sizes.ll

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no-libcalls.ll

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non-integral.ll

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nonlocal-memcpy-memcpy.ll

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nontemporal.ll

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opaque-ptr.ll

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pr29105.ll

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pr37967.ll

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pr54682.ll

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pr75010.ll

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pr102994.ll

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preserve-memssa.ll

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process_store.ll

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profitable-memset.ll

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smaller.ll

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sret.ll

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stack-move.ll

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stackrestore.ll

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store-to-memset-is-nonzero-type.ll

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store-to-memset.ll

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variable-sized-memcpy-memcpy.ll

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variable-sized-memcpy-uninit.ll

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variable-sized-memset-memcpy.ll

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vscale-crashes.ll

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vscale-memset.ll

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