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Putting r117193 back except for the compile time cost. Rather than assuming fallthroughs uses all registers, just gather the union of all successor liveins.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@117506 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2010-10-27 23:17:17 +00:00
parent 7e3383c007
commit de5fa932b9
1 changed files with 10 additions and 3 deletions
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13
lib/CodeGen/ScheduleDAGInstrs.cpp
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@ -168,9 +168,16 @@ void ScheduleDAGInstrs::AddSchedBarrierDeps() {
}
} else {
// For others, e.g. fallthrough, conditional branch, assume the exit
// uses all the registers.
// FIXME: This causes too much compile time regression. We need to compute
// liveout instead.
// uses all the registers that are livein to the successor blocks.
SmallSet<unsigned, 8> Seen;
for (MachineBasicBlock::succ_iterator SI = BB->succ_begin(),
SE = BB->succ_end(); SI != SE; ++SI)
for (MachineBasicBlock::livein_iterator I = (*SI)->livein_begin(),
E = (*SI)->livein_end(); I != E; ++I) {
unsigned Reg = *I;
if (Seen.insert(Reg))
Uses[Reg].push_back(&ExitSU);
}
}
}