Add hasLoadFromStackSlot and hasStoreToStackSlot to return whether a
machine instruction loads or stores from/to a stack slot. Unlike
isLoadFromStackSlot and isStoreFromStackSlot, the instruction may be
something other than a pure load/store (e.g. it may be an arithmetic
operation with a memory operand). This helps AsmPrinter determine when
to print a spill/reload comment.
This is only a hint since we may not be able to figure this out in all
cases. As such, it should not be relied upon for correctness.
Implement for X86. Return false by default for other architectures.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@87026 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86InstrInfo.h b/lib/Target/X86/X86InstrInfo.h
index 6eb07d5..c5809c9 100644
--- a/lib/Target/X86/X86InstrInfo.h
+++ b/lib/Target/X86/X86InstrInfo.h
@@ -449,8 +449,25 @@
unsigned &SrcSubIdx, unsigned &DstSubIdx) const;
unsigned isLoadFromStackSlot(const MachineInstr *MI, int &FrameIndex) const;
+
+ /// hasLoadFromStackSlot - If the specified machine instruction has
+ /// a load from a stack slot, return true along with the FrameIndex
+ /// of the loaded stack slot. If not, return false. Unlike
+ /// isLoadFromStackSlot, this returns true for any instructions that
+ /// loads from the stack. This is a hint only and may not catch all
+ /// cases.
+ bool hasLoadFromStackSlot(const MachineInstr *MI, int &FrameIndex) const;
+
unsigned isStoreToStackSlot(const MachineInstr *MI, int &FrameIndex) const;
+ /// hasStoreToStackSlot - If the specified machine instruction has a
+ /// store to a stack slot, return true along with the FrameIndex of
+ /// the loaded stack slot. If not, return false. Unlike
+ /// isStoreToStackSlot, this returns true for any instructions that
+ /// loads from the stack. This is a hint only and may not catch all
+ /// cases.
+ bool hasStoreToStackSlot(const MachineInstr *MI, int &FrameIndex) const;
+
bool isReallyTriviallyReMaterializable(const MachineInstr *MI,
AliasAnalysis *AA) const;
void reMaterialize(MachineBasicBlock &MBB, MachineBasicBlock::iterator MI,
@@ -610,6 +627,11 @@
unsigned OpNum,
const SmallVectorImpl<MachineOperand> &MOs,
unsigned Size, unsigned Alignment) const;
+
+ /// isFrameOperand - Return true and the FrameIndex if the specified
+ /// operand and follow operands form a reference to the stack frame.
+ bool isFrameOperand(const MachineInstr *MI, unsigned int Op,
+ int &FrameIndex) const;
};
} // End llvm namespace