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Revert r348645 - "[MemCpyOpt] memset->memcpy forwarding with undef tail"

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This revision caused trucated memsets for structs with padding. See:
http://lists.llvm.org/pipermail/llvm-commits/Week-of-Mon-20181210/610520.html



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@349002 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David L. Jones
2018-12-13 03:15:11 +00:00
parent 2ca3d46c8a
commit 064efeaec1
3 changed files with 20 additions and 40 deletions
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lib/Analysis/MemoryDependenceAnalysis.cpp
-6
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@@ -154,12 +154,6 @@ static ModRefInfo GetLocation(const Instruction *Inst, MemoryLocation &Loc,
return ModRefInfo::Mod;
}
if (const MemSetInst *MI = dyn_cast<MemSetInst>(Inst)) {
Loc = MemoryLocation::getForDest(MI);
// Conversatively assume ModRef for volatile memset.
return MI->isVolatile() ? ModRefInfo::ModRef : ModRefInfo::Mod;
}
if (const IntrinsicInst *II = dyn_cast<IntrinsicInst>(Inst)) {
switch (II->getIntrinsicID()) {
case Intrinsic::lifetime_start: