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Reorganize code in MipsTargetLowering::LowerCall to improve readability.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132756 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Akira Hatanaka 2011-06-08 17:39:33 +00:00
parent 8ae3edacfa
commit 3d21c2495d
1 changed files with 37 additions and 39 deletions
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76
lib/Target/Mips/MipsISelLowering.cpp
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@ -1760,20 +1760,41 @@ MipsTargetLowering::LowerCall(SDValue Chain, SDValue Callee,
CCInfo.AnalyzeCallOperands(Outs, CC_Mips);
// Get a count of how many bytes are to be pushed on the stack.
unsigned NumBytes = CCInfo.getNextStackOffset();
Chain = DAG.getCALLSEQ_START(Chain, DAG.getIntPtrConstant(NumBytes, true));
unsigned NextStackOffset = CCInfo.getNextStackOffset();
Chain = DAG.getCALLSEQ_START(Chain, DAG.getIntPtrConstant(NextStackOffset,
true));
// If this is the first call, create a stack frame object that points to
// a location to which .cprestore saves $gp.
if (IsPIC && !MipsFI->getGPFI())
MipsFI->setGPFI(MFI->CreateFixedObject(4, 0, true));
// Update size of the maximum argument space.
// For O32, a minimum of four words (16 bytes) of argument space is
// allocated.
if (Subtarget->isABI_O32())
NextStackOffset = std::max(NextStackOffset, (unsigned)16);
unsigned MaxCallFrameSize = MipsFI->getMaxCallFrameSize();
if (MaxCallFrameSize < NextStackOffset) {
MipsFI->setMaxCallFrameSize(NextStackOffset);
if (IsPIC) {
// $gp restore slot must be aligned.
unsigned StackAlignment = TFL->getStackAlignment();
NextStackOffset = (NextStackOffset + StackAlignment - 1) /
StackAlignment * StackAlignment;
int GPFI = MipsFI->getGPFI();
MFI->setObjectOffset(GPFI, NextStackOffset);
}
}
// With EABI is it possible to have 16 args on registers.
SmallVector<std::pair<unsigned, SDValue>, 16> RegsToPass;
SmallVector<SDValue, 8> MemOpChains;
// If this is the first call, create a stack frame object that points to
// a location to which .cprestore saves $gp. The offset of this frame object
// is set to 0, since we know nothing about the size of the argument area at
// this point.
if (IsPIC && !MipsFI->getGPFI())
MipsFI->setGPFI(MFI->CreateFixedObject(4, 0, true));
int FirstFI = -MFI->getNumFixedObjects() - 1, LastFI = 0;
// Walk the register/memloc assignments, inserting copies/loads.
@ -1846,6 +1867,12 @@ MipsTargetLowering::LowerCall(SDValue Chain, SDValue Callee,
false, false, 0));
}
// Extend range of indices of frame objects for outgoing arguments that were
// created during this function call. Skip this step if no such objects were
// created.
if (LastFI)
MipsFI->extendOutArgFIRange(FirstFI, LastFI);
// Transform all store nodes into one single node because all store
// nodes are independent of each other.
if (!MemOpChains.empty())
@ -1937,37 +1964,8 @@ MipsTargetLowering::LowerCall(SDValue Chain, SDValue Callee,
Chain = DAG.getNode(MipsISD::JmpLink, dl, NodeTys, &Ops[0], Ops.size());
InFlag = Chain.getValue(1);
// Function can have an arbitrary number of calls, so
// hold the LastArgStackLoc with the biggest offset.
unsigned MaxCallFrameSize = MipsFI->getMaxCallFrameSize();
unsigned NextStackOffset = CCInfo.getNextStackOffset();
// For O32, a minimum of four words (16 bytes) of argument space is
// allocated.
if (Subtarget->isABI_O32())
NextStackOffset = std::max(NextStackOffset, (unsigned)16);
if (MaxCallFrameSize < NextStackOffset) {
MipsFI->setMaxCallFrameSize(NextStackOffset);
if (IsPIC) {
// $gp restore slot must be aligned.
unsigned StackAlignment = TFL->getStackAlignment();
NextStackOffset = (NextStackOffset + StackAlignment - 1) /
StackAlignment * StackAlignment;
int GPFI = MipsFI->getGPFI();
MFI->setObjectOffset(GPFI, NextStackOffset);
}
}
// Extend range of indices of frame objects for outgoing arguments that were
// created during this function call. Skip this step if no such objects were
// created.
if (LastFI)
MipsFI->extendOutArgFIRange(FirstFI, LastFI);
// Create the CALLSEQ_END node.
Chain = DAG.getCALLSEQ_END(Chain, DAG.getIntPtrConstant(NumBytes, true),
Chain = DAG.getCALLSEQ_END(Chain, DAG.getIntPtrConstant(NextStackOffset, true),
DAG.getIntPtrConstant(0, true), InFlag);
InFlag = Chain.getValue(1);