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Add alignment value to allowsUnalignedMemoryAccess

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Rename to allowsMisalignedMemoryAccess.

On R600, 8 and 16 byte accesses are mostly OK with 4-byte alignment,
and don't need to be split into multiple accesses. Vector loads with
an alignment of the element type are not uncommon in OpenCL code.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214055 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Matt Arsenault
2014-07-27 17:46:40 +00:00
parent 54a7f7f9e0
commit 2dd264c8a3
23 changed files with 112 additions and 66 deletions
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lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+2 -2
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@@ -3810,7 +3810,7 @@ static bool FindOptimalMemOpLowering(std::vector<EVT> &MemOps,
if (VT == MVT::Other) {
unsigned AS = 0;
if (DstAlign >= TLI.getDataLayout()->getPointerPrefAlignment(AS) ||
TLI.allowsUnalignedMemoryAccesses(VT, AS)) {
TLI.allowsMisalignedMemoryAccesses(VT, AS, DstAlign)) {
VT = TLI.getPointerTy();
} else {
switch (DstAlign & 7) {
@@ -3870,7 +3870,7 @@ static bool FindOptimalMemOpLowering(std::vector<EVT> &MemOps,
unsigned AS = 0;
if (NumMemOps && AllowOverlap &&
VTSize >= 8 && NewVTSize < Size &&
TLI.allowsUnalignedMemoryAccesses(VT, AS, &Fast) && Fast)
TLI.allowsMisalignedMemoryAccesses(VT, AS, DstAlign, &Fast) && Fast)
VTSize = Size;
else {
VT = NewVT;