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[Statepoint Lowering] Add an option to allow use gc values in regs for landing pad 

Default value is not changed, so it is NFC actually.

The option allows to use gc values on registers in landing pads.

Reviewers: reames, dantrushin
Reviewed By: reames, dantrushin
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D94469
This commit is contained in:
Serguei Katkov 2021-01-12 11:52:48 +07:00
parent 790c75c163
commit 157efd84ab
1 changed files with 13 additions and 8 deletions
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21
llvm/lib/CodeGen/SelectionDAG/StatepointLowering.cpp
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@ -64,6 +64,10 @@ cl::opt<bool> UseRegistersForDeoptValues(
"use-registers-for-deopt-values", cl::Hidden, cl::init(false),
cl::desc("Allow using registers for non pointer deopt args"));
cl::opt<bool> UseRegistersForGCPointersInLandingPad(
"use-registers-for-gc-values-in-landing-pad", cl::Hidden, cl::init(false),
cl::desc("Allow using registers for gc pointer in landing pad"));
cl::opt<unsigned> MaxRegistersForGCPointers(
"max-registers-for-gc-values", cl::Hidden, cl::init(0),
cl::desc("Max number of VRegs allowed to pass GC pointer meta args in"));
@ -549,14 +553,15 @@ lowerStatepointMetaArgs(SmallVectorImpl<SDValue> &Ops,
// Pointers used on exceptional path of invoke statepoint.
// We cannot assing them to VRegs.
SmallSet<SDValue, 8> LPadPointers;
if (auto *StInvoke = dyn_cast_or_null<InvokeInst>(SI.StatepointInstr)) {
LandingPadInst *LPI = StInvoke->getLandingPadInst();
for (auto *Relocate : SI.GCRelocates)
if (Relocate->getOperand(0) == LPI) {
LPadPointers.insert(Builder.getValue(Relocate->getBasePtr()));
LPadPointers.insert(Builder.getValue(Relocate->getDerivedPtr()));
}
}
if (!UseRegistersForGCPointersInLandingPad)
if (auto *StInvoke = dyn_cast_or_null<InvokeInst>(SI.StatepointInstr)) {
LandingPadInst *LPI = StInvoke->getLandingPadInst();
for (auto *Relocate : SI.GCRelocates)
if (Relocate->getOperand(0) == LPI) {
LPadPointers.insert(Builder.getValue(Relocate->getBasePtr()));
LPadPointers.insert(Builder.getValue(Relocate->getDerivedPtr()));
}
}
LLVM_DEBUG(dbgs() << "Deciding how to lower GC Pointers:\n");