Implement a disgusting hack to work around broken machine code emission of
the RDCCR instruction. This fixes a bunch of programs with the JIT.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18124 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/SparcV9/SparcV9CodeEmitter.cpp b/lib/Target/SparcV9/SparcV9CodeEmitter.cpp
index 7759874..89e0a5d 100644
--- a/lib/Target/SparcV9/SparcV9CodeEmitter.cpp
+++ b/lib/Target/SparcV9/SparcV9CodeEmitter.cpp
@@ -292,7 +292,18 @@
currBB = MBB.getBasicBlock();
BBLocations[currBB] = MCE.getCurrentPCValue();
for (MachineBasicBlock::iterator I = MBB.begin(), E = MBB.end(); I != E; ++I)
- emitWord(getBinaryCodeForInstr(*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);
+ }
}