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See comments. The live intervals were not coming out of the spiller in sorted

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order, causing the inactive list in the linearscan list to get unsorted, which
basically fuxored everything up severely.

These seems to fix the joiner, so with more testing I will enable it by default.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14992 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-07-19 05:15:10 +00:00
parent 331cb7dde1
commit 57eb15e316
1 changed files with 20 additions and 1 deletions
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21
lib/CodeGen/LiveIntervalAnalysis.cpp
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@ -185,6 +185,16 @@ bool LiveIntervals::runOnMachineFunction(MachineFunction &fn) {
return true;
}
namespace {
/// CompareIntervalStar - This is a simple comparison function for interval
/// pointers. It compares based on their starting point.
struct CompareIntervalStar {
bool operator()(LiveInterval *LHS, LiveInterval* RHS) const {
return LHS->start() < RHS->start();
}
};
}
std::vector<LiveInterval*> LiveIntervals::addIntervalsForSpills(
const LiveInterval& li,
VirtRegMap& vrm,
@ -210,7 +220,7 @@ std::vector<LiveInterval*> LiveIntervals::addIntervalsForSpills(
MachineBasicBlock::iterator mi = getInstructionFromIndex(index);
for_operand:
for (unsigned i = 0; i < mi->getNumOperands(); ++i) {
for (unsigned i = 0; i != mi->getNumOperands(); ++i) {
MachineOperand& mop = mi->getOperand(i);
if (mop.isRegister() && mop.getReg() == li.reg) {
if (MachineInstr* fmi =
@ -267,6 +277,15 @@ std::vector<LiveInterval*> LiveIntervals::addIntervalsForSpills(
}
}
// FIXME: This method MUST return intervals in sorted order. If a
// particular machine instruction both uses and defines the vreg being
// spilled (e.g., vr = vr + 1) and if the def is processed before the
// use, the list ends up not sorted.
//
// The proper way to fix this is to process all uses of the vreg before we
// process any defs. However, this would require refactoring the above
// blob of code, which I'm not feeling up to right now.
std::sort(added.begin(), added.end(), CompareIntervalStar());
return added;
}