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Revert the part of 64623 that attempted to align the source in a
memcpy to match the alignment of the destination. It isn't necessary for making loads and stores handled like the SSE loadu/storeu intrinsics, and it was causing a performance regression in MultiSource/Applications/JM/lencod. The problem appears to have been a memcpy that copies from some highly aligned array into an alloca; the alloca was then being assigned a large alignment, which required codegen to perform dynamic stack-pointer re-alignment, which forced the enclosing function to have a frame pointer, which led to increased spilling. llvm-svn: 65289
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@ -9286,7 +9286,7 @@ unsigned InstCombiner::GetOrEnforceKnownAlignment(Value *V,
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Instruction *InstCombiner::SimplifyMemTransfer(MemIntrinsic *MI) {
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unsigned DstAlign = GetOrEnforceKnownAlignment(MI->getOperand(1));
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unsigned SrcAlign = GetOrEnforceKnownAlignment(MI->getOperand(2), DstAlign);
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unsigned SrcAlign = GetOrEnforceKnownAlignment(MI->getOperand(2));
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unsigned MinAlign = std::min(DstAlign, SrcAlign);
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unsigned CopyAlign = MI->getAlignment()->getZExtValue();
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