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If a function has liveins, and if the target requested that they be plopped

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into particular vregs, emit copies into the entry MBB.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23331 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-09-13 19:30:54 +00:00
parent f2cded73c4
commit fa57702388
1 changed files with 15 additions and 0 deletions
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15
lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
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@ -24,6 +24,7 @@
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/SelectionDAG.h"
#include "llvm/CodeGen/SSARegMap.h"
#include "llvm/Target/MRegisterInfo.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Target/TargetFrameInfo.h"
#include "llvm/Target/TargetInstrInfo.h"
@ -1115,6 +1116,20 @@ LowerArguments(BasicBlock *BB, SelectionDAGLowering &SDL,
}
}
// Next, if the function has live ins that need to be copied into vregs,
// emit the copies now, into the top of the block.
MachineFunction &MF = SDL.DAG.getMachineFunction();
if (MF.livein_begin() != MF.livein_end()) {
SSARegMap *RegMap = MF.getSSARegMap();
const MRegisterInfo &MRI = *MF.getTarget().getRegisterInfo();
for (MachineFunction::livein_iterator LI = MF.livein_begin(),
E = MF.livein_end(); LI != E; ++LI)
if (LI->second)
MRI.copyRegToReg(*MF.begin(), MF.begin()->end(), LI->second,
LI->first, RegMap->getRegClass(LI->second));
}
// Finally, if the target has anything special to do, allow it to do so.
EmitFunctionEntryCode(F, SDL.DAG.getMachineFunction());
}