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Add a comment about callee-saved registers. 

llvm-svn: 60495
This commit is contained in:
Dan Gohman 2008-12-03 19:30:13 +00:00
parent d49ceff6ba
commit 1a32dda4aa
1 changed files with 2 additions and 0 deletions
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2
llvm/lib/CodeGen/PostRASchedulerList.cpp
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@ -278,6 +278,8 @@ bool SchedulePostRATDList::BreakAntiDependencies() {
// TODO: If the callee saves and restores these, then we can potentially // TODO: If the callee saves and restores these, then we can potentially
// use them between the save and the restore. To do that, we could scan // use them between the save and the restore. To do that, we could scan
// the exit blocks to see which of these registers are defined. // the exit blocks to see which of these registers are defined.
// Alternatively, calle-saved registers that aren't saved and restored
// could be marked live-in in every block.
for (const unsigned *I = TRI->getCalleeSavedRegs(); *I; ++I) { for (const unsigned *I = TRI->getCalleeSavedRegs(); *I; ++I) {
unsigned Reg = *I; unsigned Reg = *I;
Classes[Reg] = reinterpret_cast<TargetRegisterClass *>(-1); Classes[Reg] = reinterpret_cast<TargetRegisterClass *>(-1);