Generate correct Sparc32 ABI compliant code for functions that return a struct.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126108 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/Sparc/DelaySlotFiller.cpp b/lib/Target/Sparc/DelaySlotFiller.cpp
index ee29275..4b12852 100644
--- a/lib/Target/Sparc/DelaySlotFiller.cpp
+++ b/lib/Target/Sparc/DelaySlotFiller.cpp
@@ -79,6 +79,7 @@
MachineBasicBlock::iterator
findDelayInstr(MachineBasicBlock &MBB, MachineBasicBlock::iterator slot);
+ bool needsUnimp(MachineBasicBlock::iterator I, unsigned &StructSize);
};
char Filler::ID = 0;
@@ -91,6 +92,7 @@
return new Filler(tm);
}
+
/// runOnMachineBasicBlock - Fill in delay slots for the given basic block.
/// We assume there is only one delay slot per delayed instruction.
///
@@ -112,6 +114,13 @@
BuildMI(MBB, ++J, I->getDebugLoc(), TII->get(SP::NOP));
else
MBB.splice(++J, &MBB, D);
+ unsigned structSize = 0;
+ if (needsUnimp(I, structSize)) {
+ MachineBasicBlock::iterator J = I;
+ ++J; //skip the delay filler.
+ BuildMI(MBB, ++J, I->getDebugLoc(),
+ TII->get(SP::UNIMP)).addImm(structSize);
+ }
}
return Changed;
}
@@ -287,6 +296,28 @@
{
if (candidate == MBB.begin())
return false;
+ if (candidate->getOpcode() == SP::UNIMP)
+ return true;
const TargetInstrDesc &prevdesc = (--candidate)->getDesc();
return prevdesc.hasDelaySlot();
}
+
+bool Filler::needsUnimp(MachineBasicBlock::iterator I, unsigned &StructSize)
+{
+ if (!I->getDesc().isCall())
+ return false;
+
+ unsigned structSizeOpNum = 0;
+ switch (I->getOpcode()) {
+ default: llvm_unreachable("Unknown call opcode.");
+ case SP::CALL: structSizeOpNum = 1; break;
+ case SP::JMPLrr:
+ case SP::JMPLri: structSizeOpNum = 2; break;
+ }
+
+ const MachineOperand &MO = I->getOperand(structSizeOpNum);
+ if (!MO.isImm())
+ return false;
+ StructSize = MO.getImm();
+ return true;
+}