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Fix a bug that caused us to crash on povray. We weren't emitting an FP_REG_KILL into a block that had a successor with a FP PHI node.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19502 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-01-12 04:21:28 +00:00
parent e11a9a93a8
commit 7dbcb75b15
1 changed files with 69 additions and 49 deletions
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118
lib/Target/X86/X86ISelPattern.cpp
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@ -326,55 +326,7 @@ namespace {
/// InstructionSelectBasicBlock - This callback is invoked by
/// SelectionDAGISel when it has created a SelectionDAG for us to codegen.
virtual void InstructionSelectBasicBlock(SelectionDAG &DAG) {
// While we're doing this, keep track of whether we see any FP code for
// FP_REG_KILL insertion.
ContainsFPCode = false;
// Scan the PHI nodes that already are inserted into this basic block. If
// any of them is a PHI of a floating point value, we need to insert an
// FP_REG_KILL.
SSARegMap *RegMap = BB->getParent()->getSSARegMap();
for (MachineBasicBlock::iterator I = BB->begin(), E = BB->end();
I != E; ++I) {
assert(I->getOpcode() == X86::PHI &&
"Isn't just PHI nodes?");
if (RegMap->getRegClass(I->getOperand(0).getReg()) ==
X86::RFPRegisterClass) {
ContainsFPCode = true;
break;
}
}
// Compute the RegPressureMap, which is an approximation for the number of
// registers required to compute each node.
ComputeRegPressure(DAG.getRoot());
// Codegen the basic block.
Select(DAG.getRoot());
// Insert FP_REG_KILL instructions into basic blocks that need them. This
// only occurs due to the floating point stackifier not being aggressive
// enough to handle arbitrary global stackification.
//
// Currently we insert an FP_REG_KILL instruction into each block that
// uses or defines a floating point virtual register.
//
// When the global register allocators (like linear scan) finally update
// live variable analysis, we can keep floating point values in registers
// across basic blocks. This will be a huge win, but we are waiting on
// the global allocators before we can do this.
//
if (ContainsFPCode && BB->succ_size()) {
BuildMI(*BB, BB->getFirstTerminator(), X86::FP_REG_KILL, 0);
++NumFPKill;
}
// Clear state used for selection.
ExprMap.clear();
LoweredTokens.clear();
RegPressureMap.clear();
}
virtual void InstructionSelectBasicBlock(SelectionDAG &DAG);
bool isFoldableLoad(SDOperand Op);
void EmitFoldedLoad(SDOperand Op, X86AddressMode &AM);
@ -390,6 +342,72 @@ namespace {
};
}
/// InstructionSelectBasicBlock - This callback is invoked by SelectionDAGISel
/// when it has created a SelectionDAG for us to codegen.
void ISel::InstructionSelectBasicBlock(SelectionDAG &DAG) {
// While we're doing this, keep track of whether we see any FP code for
// FP_REG_KILL insertion.
ContainsFPCode = false;
// Scan the PHI nodes that already are inserted into this basic block. If any
// of them is a PHI of a floating point value, we need to insert an
// FP_REG_KILL.
SSARegMap *RegMap = BB->getParent()->getSSARegMap();
for (MachineBasicBlock::iterator I = BB->begin(), E = BB->end();
I != E; ++I) {
assert(I->getOpcode() == X86::PHI &&
"Isn't just PHI nodes?");
if (RegMap->getRegClass(I->getOperand(0).getReg()) ==
X86::RFPRegisterClass) {
ContainsFPCode = true;
break;
}
}
// Compute the RegPressureMap, which is an approximation for the number of
// registers required to compute each node.
ComputeRegPressure(DAG.getRoot());
// Codegen the basic block.
Select(DAG.getRoot());
// Finally, look at all of the successors of this block. If any contain a PHI
// node of FP type, we need to insert an FP_REG_KILL in this block.
for (MachineBasicBlock::succ_iterator SI = BB->succ_begin(),
E = BB->succ_end(); SI != E && !ContainsFPCode; ++SI)
for (MachineBasicBlock::iterator I = (*SI)->begin(), E = (*SI)->end();
I != E && I->getOpcode() == X86::PHI; ++I) {
if (RegMap->getRegClass(I->getOperand(0).getReg()) ==
X86::RFPRegisterClass) {
ContainsFPCode = true;
break;
}
}
// Insert FP_REG_KILL instructions into basic blocks that need them. This
// only occurs due to the floating point stackifier not being aggressive
// enough to handle arbitrary global stackification.
//
// Currently we insert an FP_REG_KILL instruction into each block that uses or
// defines a floating point virtual register.
//
// When the global register allocators (like linear scan) finally update live
// variable analysis, we can keep floating point values in registers across
// basic blocks. This will be a huge win, but we are waiting on the global
// allocators before we can do this.
//
if (ContainsFPCode && BB->succ_size()) {
BuildMI(*BB, BB->getFirstTerminator(), X86::FP_REG_KILL, 0);
++NumFPKill;
}
// Clear state used for selection.
ExprMap.clear();
LoweredTokens.clear();
RegPressureMap.clear();
}
// ComputeRegPressure - Compute the RegPressureMap, which is an approximation
// for the number of registers required to compute each node. This is basically
// computing a generalized form of the Sethi-Ullman number for each node.
@ -1222,6 +1240,7 @@ unsigned ISel::SelectExpr(SDOperand N) {
switch (SrcTy) {
case MVT::i64:
assert(0 && "Cast ulong to FP not implemented yet!");
// FIXME: this won't work for cast [u]long to FP
addFrameReference(BuildMI(BB, X86::MOV32mr, 5),
FrameIdx).addReg(Tmp1);
@ -1357,6 +1376,7 @@ unsigned ISel::SelectExpr(SDOperand N) {
assert(0 && "Unknown integer type!");
case MVT::i64:
// FIXME: this isn't gunna work.
assert(0 && "Cast FP to long not implemented yet!");
addFrameReference(BuildMI(BB, X86::MOV32rm, 4, Result), FrameIdx);
addFrameReference(BuildMI(BB, X86::MOV32rm, 4, Result+1), FrameIdx, 4);
case MVT::i32: