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Add support for byval args. Patch by Job Noorman!

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@168439 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Anton Korobeynikov 2012-11-21 17:23:03 +00:00
parent 6ee1e0867d
commit 6cbeb4d839
3 changed files with 72 additions and 17 deletions
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3
lib/Target/MSP430/MSP430CallingConv.td
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@ -24,6 +24,9 @@ def RetCC_MSP430 : CallingConv<[
// MSP430 Argument Calling Conventions
//===----------------------------------------------------------------------===//
def CC_MSP430 : CallingConv<[
// Pass by value if the byval attribute is given
CCIfByVal<CCPassByVal<2, 2>>,
// Promote i8 arguments to i16.
CCIfType<[i8], CCPromoteToType<i16>>,

60
lib/Target/MSP430/MSP430ISelLowering.cpp
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@ -357,22 +357,34 @@ MSP430TargetLowering::LowerCCCArguments(SDValue Chain,
} else {
// Sanity check
assert(VA.isMemLoc());
// Load the argument to a virtual register
unsigned ObjSize = VA.getLocVT().getSizeInBits()/8;
if (ObjSize > 2) {
errs() << "LowerFormalArguments Unhandled argument type: "
<< EVT(VA.getLocVT()).getEVTString()
<< "\n";
}
// Create the frame index object for this incoming parameter...
int FI = MFI->CreateFixedObject(ObjSize, VA.getLocMemOffset(), true);
// Create the SelectionDAG nodes corresponding to a load
//from this parameter
SDValue FIN = DAG.getFrameIndex(FI, MVT::i16);
InVals.push_back(DAG.getLoad(VA.getLocVT(), dl, Chain, FIN,
MachinePointerInfo::getFixedStack(FI),
false, false, false, 0));
SDValue InVal;
ISD::ArgFlagsTy Flags = Ins[i].Flags;
if (Flags.isByVal()) {
int FI = MFI->CreateFixedObject(Flags.getByValSize(),
VA.getLocMemOffset(), true);
InVal = DAG.getFrameIndex(FI, getPointerTy());
} else {
// Load the argument to a virtual register
unsigned ObjSize = VA.getLocVT().getSizeInBits()/8;
if (ObjSize > 2) {
errs() << "LowerFormalArguments Unhandled argument type: "
<< EVT(VA.getLocVT()).getEVTString()
<< "\n";
}
// Create the frame index object for this incoming parameter...
int FI = MFI->CreateFixedObject(ObjSize, VA.getLocMemOffset(), true);
// Create the SelectionDAG nodes corresponding to a load
//from this parameter
SDValue FIN = DAG.getFrameIndex(FI, MVT::i16);
InVal = DAG.getLoad(VA.getLocVT(), dl, Chain, FIN,
MachinePointerInfo::getFixedStack(FI),
false, false, false, 0);
}
InVals.push_back(InVal);
}
}
@ -498,9 +510,23 @@ MSP430TargetLowering::LowerCCCCallTo(SDValue Chain, SDValue Callee,
StackPtr,
DAG.getIntPtrConstant(VA.getLocMemOffset()));
SDValue MemOp;
ISD::ArgFlagsTy Flags = Outs[i].Flags;
MemOpChains.push_back(DAG.getStore(Chain, dl, Arg, PtrOff,
MachinePointerInfo(),false, false, 0));
if (Flags.isByVal()) {
SDValue SizeNode = DAG.getConstant(Flags.getByValSize(), MVT::i16);
MemOp = DAG.getMemcpy(Chain, dl, PtrOff, Arg, SizeNode,
Flags.getByValAlign(),
/*isVolatile*/false,
/*AlwaysInline=*/true,
MachinePointerInfo(),
MachinePointerInfo());
} else {
MemOp = DAG.getStore(Chain, dl, Arg, PtrOff, MachinePointerInfo(),
false, false, 0);
}
MemOpChains.push_back(MemOp);
}
}

26
test/CodeGen/MSP430/byval.ll Normal file
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@ -0,0 +1,26 @@
; RUN: llc < %s | FileCheck %s
target datalayout = "e-p:16:16:16-i8:8:8-i16:16:16-i32:16:32-n8:16"
target triple = "msp430---elf"
%struct.Foo = type { i16, i16, i16 }
@foo = global %struct.Foo { i16 1, i16 2, i16 3 }, align 2
define i16 @callee(%struct.Foo* byval %f) nounwind {
entry:
; CHECK: callee:
; CHECK: mov.w 2(r1), r15
%0 = getelementptr inbounds %struct.Foo* %f, i32 0, i32 0
%1 = load i16* %0, align 2
ret i16 %1
}
define void @caller() nounwind {
entry:
; CHECK: caller:
; CHECK: mov.w &foo+4, 4(r1)
; CHECK-NEXT: mov.w &foo+2, 2(r1)
; CHECK-NEXT: mov.w &foo, 0(r1)
%call = call i16 @callee(%struct.Foo* byval @foo)
ret void
}