[llvm-uc] [PATCH 1/3] Add function arguement passed in registers support
- From: Chen Wei-Ren <chenwj@xxxxxxxxxxxxxxxxx>
- To: llvm-uc@xxxxxxxxxxxxx
- Date: Thu, 20 Dec 2012 15:37:58 +0800
We add if-else statement here to check if the arguement is passed in register
or memory. According to UniCore32-ABI [1], the first four arguements are passed
in r0 - r3 registers. We only deal with i32 arguement at this moment. i8 and i16
needed to be addressed in the future by using unsigned extension.
[1] http://mprc.pku.edu.cn/~guanxuetao/linux/manual/UniCore32-ABI-1.1.0-UC4.pdf
Signed-off-by: Chen Wei-Ren <chenwj@xxxxxxxxxxxxxxxxx>
---
lib/Target/UniCore/UniCoreISelLowering.cpp | 41 +++++++++++++++++++++++-----
1 files changed, 34 insertions(+), 7 deletions(-)
diff --git a/lib/Target/UniCore/UniCoreISelLowering.cpp
b/lib/Target/UniCore/UniCoreISelLowering.cpp
index 07ec567..7e9daee 100644
--- a/lib/Target/UniCore/UniCoreISelLowering.cpp
+++ b/lib/Target/UniCore/UniCoreISelLowering.cpp
@@ -96,13 +96,40 @@ UniCoreTargetLowering::LowerCCCArguments(SDValue Chain,
for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
CCValAssign &VA = ArgLocs[i];
- unsigned ObjSize = VA.getLocVT().getSizeInBits()/8;
-
- int FI = MFI->CreateFixedObject(ObjSize, VA.getLocMemOffset(), true);
- SDValue FIN = DAG.getFrameIndex(FI, MVT::i32);
- InVals.push_back(DAG.getLoad(VA.getLocVT(), dl, Chain, FIN,
- MachinePointerInfo::getFixedStack(FI),
- false, false, false, 0));
+ if (VA.isRegLoc()) {
+ // Arguments passed in registers
+ EVT RegVT = VA.getLocVT();
+ switch (RegVT.getSimpleVT().SimpleTy) {
+ default:
+ {
+#ifndef NDEBUG
+ errs() << "LowerFormalArguments Unhandled argument type: "
+ << RegVT.getSimpleVT().SimpleTy << "\n";
+#endif
+ llvm_unreachable(0);
+ }
+ case MVT::i32:
+ unsigned VReg =
RegInfo.createVirtualRegister(&UniCore::GPRRegsRegClass);
+ RegInfo.addLiveIn(VA.getLocReg(), VReg);
+ SDValue ArgValue = DAG.getCopyFromReg(Chain, dl, VReg, RegVT);
+
+ if (VA.getLocInfo() != CCValAssign::Full)
+ ArgValue = DAG.getNode(ISD::TRUNCATE, dl, VA.getValVT(), ArgValue);
+
+ InVals.push_back(ArgValue);
+ }
+ } else {
+ // Sanity check
+ assert(VA.isMemLoc());
+
+ unsigned ObjSize = VA.getLocVT().getSizeInBits()/8;
+
+ int FI = MFI->CreateFixedObject(ObjSize, VA.getLocMemOffset(), true);
+ SDValue FIN = DAG.getFrameIndex(FI, MVT::i32);
+ InVals.push_back(DAG.getLoad(VA.getLocVT(), dl, Chain, FIN,
+ MachinePointerInfo::getFixedStack(FI),
+ false, false, false, 0));
+ }
}
return Chain;
--
1.7.3.4
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