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-rw-r--r--llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp18
1 files changed, 15 insertions, 3 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index d41d46b7b14..4122ce06b04 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -4151,6 +4151,18 @@ static bool FindOptimalMemOpLowering(std::vector<EVT> &MemOps,
return true;
}
+static bool shouldLowerMemFuncForSize(const MachineFunction &MF) {
+ const Function *F = MF.getFunction();
+ bool HasMinSize = F->hasFnAttribute(Attribute::MinSize);
+ bool HasOptSize = F->hasFnAttribute(Attribute::OptimizeForSize);
+
+ // On Darwin, -Os means optimize for size without hurting performance, so
+ // only really optimize for size when -Oz (MinSize) is used.
+ if (MF.getTarget().getTargetTriple().isOSDarwin())
+ return HasMinSize;
+ return HasOptSize || HasMinSize;
+}
+
static SDValue getMemcpyLoadsAndStores(SelectionDAG &DAG, SDLoc dl,
SDValue Chain, SDValue Dst,
SDValue Src, uint64_t Size,
@@ -4171,7 +4183,7 @@ static SDValue getMemcpyLoadsAndStores(SelectionDAG &DAG, SDLoc dl,
bool DstAlignCanChange = false;
MachineFunction &MF = DAG.getMachineFunction();
MachineFrameInfo *MFI = MF.getFrameInfo();
- bool OptSize = MF.getFunction()->hasFnAttribute(Attribute::OptimizeForSize);
+ bool OptSize = shouldLowerMemFuncForSize(MF);
FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(Dst);
if (FI && !MFI->isFixedObjectIndex(FI->getIndex()))
DstAlignCanChange = true;
@@ -4284,7 +4296,7 @@ static SDValue getMemmoveLoadsAndStores(SelectionDAG &DAG, SDLoc dl,
bool DstAlignCanChange = false;
MachineFunction &MF = DAG.getMachineFunction();
MachineFrameInfo *MFI = MF.getFrameInfo();
- bool OptSize = MF.getFunction()->hasFnAttribute(Attribute::OptimizeForSize);
+ bool OptSize = shouldLowerMemFuncForSize(MF);
FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(Dst);
if (FI && !MFI->isFixedObjectIndex(FI->getIndex()))
DstAlignCanChange = true;
@@ -4378,7 +4390,7 @@ static SDValue getMemsetStores(SelectionDAG &DAG, SDLoc dl,
bool DstAlignCanChange = false;
MachineFunction &MF = DAG.getMachineFunction();
MachineFrameInfo *MFI = MF.getFrameInfo();
- bool OptSize = MF.getFunction()->hasFnAttribute(Attribute::OptimizeForSize);
+ bool OptSize = shouldLowerMemFuncForSize(MF);
FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(Dst);
if (FI && !MFI->isFixedObjectIndex(FI->getIndex()))
DstAlignCanChange = true;
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