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Sorry about the churn. One more change to getOptimalMemOpType() hook. Did I

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mention the inline memcpy / memset expansion code is a mess?

This patch split the ZeroOrLdSrc argument into two: IsMemset and ZeroMemset.
The first indicates whether it is expanding a memset or a memcpy / memmove.
The later is whether the memset is a memset of zero. It's totally possible
(likely even) that targets may want to do different things for memcpy and
memset of zero.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169959 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2012-12-12 02:34:41 +00:00
parent 2ab2421a4e
commit 946a3a9f22
10 changed files with 43 additions and 44 deletions
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13
lib/CodeGen/SelectionDAG/SelectionDAG.cpp
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@@ -3426,7 +3426,8 @@ static bool isMemSrcFromString(SDValue Src, StringRef &Str) {
static bool FindOptimalMemOpLowering(std::vector<EVT> &MemOps,
unsigned Limit, uint64_t Size,
unsigned DstAlign, unsigned SrcAlign,
bool ZeroOrLdSrc,
bool IsMemset,
bool ZeroMemset,
bool MemcpyStrSrc,
bool AllowOverlap,
SelectionDAG &DAG,
@@ -3441,7 +3442,7 @@ static bool FindOptimalMemOpLowering(std::vector<EVT> &MemOps,
// 'MemcpyStrSrc' indicates whether the memcpy source is constant so it does
// not need to be loaded.
EVT VT = TLI.getOptimalMemOpType(Size, DstAlign, SrcAlign,
ZeroOrLdSrc, MemcpyStrSrc,
IsMemset, ZeroMemset, MemcpyStrSrc,
DAG.getMachineFunction());
if (VT == MVT::Other) {
@@ -3559,7 +3560,7 @@ static SDValue getMemcpyLoadsAndStores(SelectionDAG &DAG, DebugLoc dl,
if (!FindOptimalMemOpLowering(MemOps, Limit, Size,
(DstAlignCanChange ? 0 : Align),
(isZeroStr ? 0 : SrcAlign),
true, CopyFromStr, true, DAG, TLI))
false, false, CopyFromStr, true, DAG, TLI))
return SDValue();
if (DstAlignCanChange) {
@@ -3660,8 +3661,8 @@ static SDValue getMemmoveLoadsAndStores(SelectionDAG &DAG, DebugLoc dl,
unsigned Limit = AlwaysInline ? ~0U : TLI.getMaxStoresPerMemmove(OptSize);
if (!FindOptimalMemOpLowering(MemOps, Limit, Size,
(DstAlignCanChange ? 0 : Align),
SrcAlign, true, false, false, DAG, TLI))
(DstAlignCanChange ? 0 : Align), SrcAlign,
false, false, false, false, DAG, TLI))
return SDValue();
if (DstAlignCanChange) {
@@ -3737,7 +3738,7 @@ static SDValue getMemsetStores(SelectionDAG &DAG, DebugLoc dl,
isa<ConstantSDNode>(Src) && cast<ConstantSDNode>(Src)->isNullValue();
if (!FindOptimalMemOpLowering(MemOps, TLI.getMaxStoresPerMemset(OptSize),
Size, (DstAlignCanChange ? 0 : Align), 0,
IsZeroVal, false, true, DAG, TLI))
true, IsZeroVal, false, true, DAG, TLI))
return SDValue();
if (DstAlignCanChange) {