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Make this code safe for when loadRegFromStackSlot inserts multiple instructions.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23108 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-08-26 22:18:32 +00:00
parent 28b9cc2d13
commit ed461e0faf
1 changed files with 13 additions and 1 deletions
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14
lib/CodeGen/PrologEpilogInserter.cpp
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@ -217,13 +217,25 @@ void PEI::saveCallerSavedRegisters(MachineFunction &Fn) {
while (I2 != MBB->begin() && TII.isTerminatorInstr((--I2)->getOpcode()))
I = I2;
bool AtStart = I2 == MBB->begin();
MachineBasicBlock::iterator BeforeI = I;
if (!AtStart)
--BeforeI;
// Restore all registers immediately before the return and any terminators
// that preceed it.
for (unsigned i = 0, e = RegsToSave.size(); i != e; ++i) {
RegInfo->loadRegFromStackSlot(*MBB, I, RegsToSave[i], StackSlots[i]);
assert(I != MBB->begin() &&
"loadRegFromStackSlot didn't insert any code!");
--I; // Insert in reverse order
// Insert in reverse order. loadRegFromStackSlot can insert multiple
// instructions.
if (AtStart)
I = MBB->begin();
else {
I = BeforeI;
++I;
}
}
}
}