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8081057fca
llvm/test/Transforms/MemCpyOpt
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Ahmed Bougacha 8081057fca [MemCpyOpt] Turn memcpy from just-memset'd source into memset. 
There's no point in copying around constants, so, when all else fails,
we can still transform memcpy of memset into two independent memsets.

To quote the example, we can turn:
  memset(dst1, c, dst1_size);
  memcpy(dst2, dst1, dst2_size);
into:
  memset(dst1, c, dst1_size);
  memset(dst2, c, dst2_size);
When dst2_size <= dst1_size.

Like r235232 for copy constructors, this can occur in move constructors.

Differential Revision: http://reviews.llvm.org/D9682


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237506 91177308-0d34-0410-b5e6-96231b3b80d8
2015-05-16 01:32:26 +00:00
..
2008-02-24-MultipleUseofSRet.ll [opaque pointer type] Add textual IR support for explicit type parameter to getelementptr instruction 2015-02-27 19:29:02 +00:00
2008-03-13-ReturnSlotBitcast.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2011-06-02-CallSlotOverwritten.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
align.ll [opaque pointer type] Add textual IR support for explicit type parameter to getelementptr instruction 2015-02-27 19:29:02 +00:00
atomic.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
callslot_aa.ll Properly update AA metadata when performing call slot optimization 2015-02-07 17:54:36 +00:00
callslot_deref.ll [MemCpyOpt] Turn memcpy from just-memset'd source into memset. 2015-05-16 01:32:26 +00:00
capturing-func.ll Don't eliminate memcpy's when the address of the pointer may itself be relevant. Fixes PR18304. Patch by David Wiberg! 2014-07-14 18:52:02 +00:00
crash.ll [opaque pointer type] Add textual IR support for explicit type parameter to getelementptr instruction 2015-02-27 19:29:02 +00:00
form-memset.ll [opaque pointer type] Add textual IR support for explicit type parameter to the call instruction 2015-04-16 23:24:18 +00:00
loadstore-sret.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
memcpy-to-memset-with-lifetimes.ll [MemCpyOpt] Turn memcpy from just-memset'd source into memset. 2015-05-16 01:32:26 +00:00
memcpy-to-memset.ll [opaque pointer type] Add textual IR support for explicit type parameter to getelementptr instruction 2015-02-27 19:29:02 +00:00
memcpy-undef.ll [opaque pointer type] Add textual IR support for explicit type parameter to getelementptr instruction 2015-02-27 19:29:02 +00:00
memcpy.ll [opaque pointer type] Add textual IR support for explicit type parameter to gep operator 2015-03-13 18:20:45 +00:00
memmove.ll [opaque pointer type] Add textual IR support for explicit type parameter to gep operator 2015-03-13 18:20:45 +00:00
memset-memcpy-redundant-memset.ll Remove dead code in testcase. NFC. 2015-05-16 01:10:40 +00:00
memset-memcpy-to-2x-memset.ll [MemCpyOpt] Turn memcpy from just-memset'd source into memset. 2015-05-16 01:32:26 +00:00
smaller.ll [opaque pointer type] Add textual IR support for explicit type parameter to gep operator 2015-03-13 18:20:45 +00:00
sret.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00