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llvm-project/llvm/test/Transforms/MemCpyOpt
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Nikita Popov 5556660971 [MemCpyOpt] Handle read from lifetime.start with offset 
This fixes a regression from the MemDep-based implementation:
MemDep completely ignores lifetime.start intrinsics that aren't
MustAlias -- this is probably unsound, but it does mean that the
MemDep based implementation successfully eliminated memcpy's from
lifetime.start if the memcpy happens at an offset, rather than
the base address of the alloca.

Add a special case for the case where the lifetime.start spans the
whole alloca (which is pretty much the only kind of lifetime.start
that frontends ever emit), as we don't need to figure out our exact
aliasing relationship in that case, the whole alloca is dead prior
to the call.

If this doesn't cover all practically relevant cases, then it
would be possible to make use of the recently added PartialAlias
clobber offsets to make this more precise.
 		2021-03-13 20:38:09 +01:00
..
2008-02-24-MultipleUseofSRet.ll OpaquePtr: Bulk update tests to use typed sret 2020-11-20 17:58:26 -05:00
2008-03-13-ReturnSlotBitcast.ll [MemCpyOpt] Remove unused check-prefixes 2020-11-09 12:18:20 +00:00
2011-06-02-CallSlotOverwritten.ll OpaquePtr: Bulk update tests to use typed sret 2020-11-20 17:58:26 -05:00
aa-recursion-assertion-failure.ll [BasicAA] Move assumption tracking into AAQI 2021-01-17 10:34:35 +01:00
aggregate-type-crash.ll [MemCpyOpt] Remove unused check-prefixes 2020-11-09 12:18:20 +00:00
align.ll [MemCpyOpt] Remove unused check-prefixes 2020-11-09 12:18:20 +00:00
atomic.ll [MemCpyOpt] Remove unused check-prefixes 2020-11-09 12:18:20 +00:00
byval-readnone.ll [MemCpyOpt] Fix handling of readnone byval arguments 2021-02-22 18:48:31 +01:00
callslot.ll [MemCpyOpt] Port to MemorySSA 2020-12-01 17:57:41 +01:00
callslot_aa.ll [MemCpyOpt] Remove unused check-prefixes 2020-11-09 12:18:20 +00:00
callslot_badaa.ll [MemCpyOpt] Correctly merge alias scopes during call slot optimization 2020-12-03 09:23:37 -08:00
callslot_deref.ll [MemCpyOpt] Remove unused check-prefixes 2020-11-09 12:18:20 +00:00
callslot_throw.ll [MemCpyOpt] Remove unused check-prefixes 2020-11-09 12:18:20 +00:00
capturing-func.ll [MemCpyOpt] Remove unused check-prefixes 2020-11-09 12:18:20 +00:00
crash.ll [ValueTracking][MemCpyOpt] avoid crash on inttoptr with vector pointer type (PR48075) 2020-11-22 12:54:18 -05:00
fca2memcpy.ll [MemCpyOpt] Remove unused check-prefixes 2020-11-09 12:18:20 +00:00
form-memset.ll [MemCpyOpt] Remove unused check-prefixes 2020-11-09 12:18:20 +00:00
invariant.start.ll [MemCpyOpt] Port to MemorySSA 2020-12-01 17:57:41 +01:00
lifetime.ll Reland "[Libcalls, Attrs] Annotate libcalls with noundef" 2021-02-20 06:18:48 +01:00
load-store-to-memcpy.ll [MemCpyOpt] Remove unused check-prefixes 2020-11-09 12:18:20 +00:00
loadstore-sret.ll OpaquePtr: Bulk update tests to use typed sret 2020-11-20 17:58:26 -05:00
memcpy-in-loop.ll [MemorySSA] Don't bail on phi starting access 2021-03-13 10:53:13 +01:00
memcpy-invoke-memcpy.ll [FileCheck] Enforce --allow-unused-prefixes=false for llvm/test/Transforms 2020-12-09 08:51:38 -08:00
memcpy-to-memset-with-lifetimes.ll Reland "[Libcalls, Attrs] Annotate libcalls with noundef" 2021-02-20 06:18:48 +01:00
memcpy-to-memset.ll [MemCpyOpt] Remove unused check-prefixes 2020-11-09 12:18:20 +00:00
memcpy-undef.ll [MemCpyOpt] Handle read from lifetime.start with offset 2021-03-13 20:38:09 +01:00
memcpy.ll [Local] Treat calls that may not return as being alive. 2021-01-23 16:05:14 +00:00
memmove.ll [MemCpyOpt] Remove unused check-prefixes 2020-11-09 12:18:20 +00:00
memset-memcpy-oversized.ll [MemCpyOpt] Remove unused check-prefixes 2020-11-09 12:18:20 +00:00
memset-memcpy-redundant-memset.ll [MemCpyOpt] Use AA to check for MustAlias between memset and memcpy 2021-03-13 11:41:15 +01:00
memset-memcpy-to-2x-memset.ll [MemCpyOpt] Remove unused check-prefixes 2020-11-09 12:18:20 +00:00
merge-into-memset.ll [MemCpyOpt] Port to MemorySSA 2020-12-01 17:57:41 +01:00
mixed-sizes.ll [MemCpyOpt] Port to MemorySSA 2020-12-01 17:57:41 +01:00
non-integral.ll [MemCpyOpt] Remove unused check-prefixes 2020-11-09 12:18:20 +00:00
nonlocal-memcpy-memcpy.ll [MemCpyOpt] Port to MemorySSA 2020-12-01 17:57:41 +01:00
nontemporal.ll [MemCpyOpt] Remove unused check-prefixes 2020-11-09 12:18:20 +00:00
pr29105.ll Reland "[Libcalls, Attrs] Annotate libcalls with noundef" 2021-02-20 06:18:48 +01:00
pr37967.ll [MemCpyOpt] Remove unused check-prefixes 2020-11-09 12:18:20 +00:00
preserve-memssa.ll [MemCpyOpt] Don't generate zero-size memset 2021-03-13 11:41:15 +01:00
process_store.ll [MemCpyOpt] Remove unused check-prefixes 2020-11-09 12:18:20 +00:00
profitable-memset.ll [MemCpyOpt] Remove unused check-prefixes 2020-11-09 12:18:20 +00:00
smaller.ll OpaquePtr: Bulk update tests to use typed byval 2020-11-20 14:00:46 -05:00
sret.ll OpaquePtr: Update more tests to use typed sret 2020-11-20 20:08:43 -05:00
stackrestore.ll [MemCpyOpt] Port to MemorySSA 2020-12-01 17:57:41 +01:00
store-to-memset-is-nonzero-type.ll [MemCpyOpt] Remove unused check-prefixes 2020-11-09 12:18:20 +00:00
store-to-memset.ll [MemCpyOpt] Remove unused check-prefixes 2020-11-09 12:18:20 +00:00
vscale-memset.ll [MemCpyOpt] Remove unused check-prefixes 2020-11-09 12:18:20 +00:00