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Add TargetInstrInfo::isSafeToMoveRegisterClassDefs. It returns true if it's safe to move an instruction which defines a value in the register class. Replace pre-splitting specific IgnoreRegisterClassBarriers with this new hook.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63936 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2009-02-06 17:17:30 +00:00
parent b3a021cdb3
commit 4350eb86a7
4 changed files with 14 additions and 13 deletions
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5
lib/CodeGen/PreAllocSplitting.cpp
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@@ -1128,7 +1128,10 @@ PreAllocSplitting::SplitRegLiveIntervals(const TargetRegisterClass **RCs,
// by the current barrier.
SmallVector<LiveInterval*, 8> Intervals;
for (const TargetRegisterClass **RC = RCs; *RC; ++RC) {
if (TII->IgnoreRegisterClassBarriers(*RC))
// FIXME: If it's not safe to move any instruction that defines the barrier
// register class, then it means there are some special dependencies which
// codegen is not modelling. Ignore these barriers for now.
if (!TII->isSafeToMoveRegClassDefs(*RC))
continue;
std::vector<unsigned> &VRs = MRI->getRegClassVirtRegs(*RC);
for (unsigned i = 0, e = VRs.size(); i != e; ++i) {