LivePhysRegs: Rework constructor + documentation; NFC
- Take reference instead of pointer to a TRI that cannot be nullptr.
- Improve documentation comments.
llvm-svn: 304038
diff --git a/llvm/lib/Target/ARM/Thumb1FrameLowering.cpp b/llvm/lib/Target/ARM/Thumb1FrameLowering.cpp
index 1a17d4e..f917c35 100644
--- a/llvm/lib/Target/ARM/Thumb1FrameLowering.cpp
+++ b/llvm/lib/Target/ARM/Thumb1FrameLowering.cpp
@@ -535,14 +535,14 @@
// Look for a temporary register to use.
// First, compute the liveness information.
- LivePhysRegs UsedRegs(STI.getRegisterInfo());
+ const TargetRegisterInfo &TRI = *STI.getRegisterInfo();
+ LivePhysRegs UsedRegs(TRI);
UsedRegs.addLiveOuts(MBB);
// The semantic of pristines changed recently and now,
// the callee-saved registers that are touched in the function
// are not part of the pristines set anymore.
// Add those callee-saved now.
- const TargetRegisterInfo *TRI = STI.getRegisterInfo();
- const MCPhysReg *CSRegs = TRI->getCalleeSavedRegs(&MF);
+ const MCPhysReg *CSRegs = TRI.getCalleeSavedRegs(&MF);
for (unsigned i = 0; CSRegs[i]; ++i)
UsedRegs.addReg(CSRegs[i]);
@@ -561,12 +561,12 @@
// And some temporary register, just in case.
unsigned TemporaryReg = 0;
BitVector PopFriendly =
- TRI->getAllocatableSet(MF, TRI->getRegClass(ARM::tGPRRegClassID));
+ TRI.getAllocatableSet(MF, TRI.getRegClass(ARM::tGPRRegClassID));
assert(PopFriendly.any() && "No allocatable pop-friendly register?!");
// Rebuild the GPRs from the high registers because they are removed
// form the GPR reg class for thumb1.
BitVector GPRsNoLRSP =
- TRI->getAllocatableSet(MF, TRI->getRegClass(ARM::hGPRRegClassID));
+ TRI.getAllocatableSet(MF, TRI.getRegClass(ARM::hGPRRegClassID));
GPRsNoLRSP |= PopFriendly;
GPRsNoLRSP.reset(ARM::LR);
GPRsNoLRSP.reset(ARM::SP);