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Implement a disgusting hack to work around broken machine code emission of 

the RDCCR instruction.  This fixes a bunch of programs with the JIT.

llvm-svn: 18124
This commit is contained in:
Chris Lattner 2004-11-22 21:25:10 +00:00
parent ab9cf27cd0
commit 80ad8871e7
1 changed files with 12 additions and 1 deletions
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11
llvm/lib/Target/SparcV9/SparcV9CodeEmitter.cpp
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@ -292,7 +292,18 @@ void SparcV9CodeEmitter::emitBasicBlock(MachineBasicBlock &MBB) {
currBB = MBB.getBasicBlock();
BBLocations[currBB] = MCE.getCurrentPCValue();
for (MachineBasicBlock::iterator I = MBB.begin(), E = MBB.end(); I != E; ++I)
if (I->getOpcode() != V9::RDCCR) {
emitWord(getBinaryCodeForInstr(*I));
} else {
// FIXME: The tblgen produced code emitter cannot deal with the fact that
// machine operand #0 of the RDCCR instruction should be ignored. This is
// really a bug in the representation of the RDCCR instruction (which has
// no need to explicitly represent the CCR dest), but we hack around it
// here.
unsigned RegNo = getMachineOpValue(*I, I->getOperand(1));
RegNo &= (1<<5)-1;
emitWord((RegNo << 25) | 2168487936U);
}
}