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Add in the first iteration of support for llvm/clang/lldb to allow variable per address space pointer sizes to be optimized correctly.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165726 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Micah Villmow
2012-10-11 17:21:41 +00:00
parent ebba49395c
commit f3840d2c16
40 changed files with 188 additions and 109 deletions
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lib/Transforms/Scalar/MemCpyOptimizer.cpp
+3 -2
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@@ -174,10 +174,11 @@ bool MemsetRange::isProfitableToUseMemset(const DataLayout &TD) const {
// this width can be stored. If so, check to see whether we will end up
// actually reducing the number of stores used.
unsigned Bytes = unsigned(End-Start);
unsigned NumPointerStores = Bytes/TD.getPointerSize();
unsigned AS = cast<StoreInst>(TheStores[0])->getPointerAddressSpace();
unsigned NumPointerStores = Bytes/TD.getPointerSize(AS);
// Assume the remaining bytes if any are done a byte at a time.
unsigned NumByteStores = Bytes - NumPointerStores*TD.getPointerSize();
unsigned NumByteStores = Bytes - NumPointerStores*TD.getPointerSize(AS);
// If we will reduce the # stores (according to this heuristic), do the
// transformation. This encourages merging 4 x i8 -> i32 and 2 x i16 -> i32