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Instead of adding copyfromreg's to handle physical definitions. Now isel can

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simply specify them as results and let scheduledag handle them. That
is, instead of
SDOperand Flag = DAG.getTargetNode(Opc, MVT::i32, MVT::Flag, ...)
SDOperand Result = DAG.getCopyFromReg(Chain, X86::EAX, MVT::i32, Flag)

Just write:
SDOperand Result = DAG.getTargetNode(Opc, MVT::i32, MVT::i32, ...)

And let scheduledag emit the move from X86::EAX to a virtual register.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40710 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2007-08-02 00:28:15 +00:00
parent b5910820ce
commit 8409747efa
2 changed files with 87 additions and 68 deletions
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9
include/llvm/CodeGen/ScheduleDAG.h
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@@ -245,7 +245,16 @@ namespace llvm {
/// EmitNoop - Emit a noop instruction.
///
void EmitNoop();
/// EmitCopyFromReg - Generate machine code for an CopyFromReg node or an
/// implicit physical register output.
void EmitCopyFromReg(SDNode *Node, unsigned ResNo, unsigned SrcReg,
DenseMap<SDOperand, unsigned> &VRBaseMap);
void CreateVirtualRegisters(SDNode *Node, MachineInstr *MI,
const TargetInstrDescriptor &II,
DenseMap<SDOperand, unsigned> &VRBaseMap);
void EmitSchedule();
void dumpSchedule() const;