diff options
| -rw-r--r-- | llvm/include/llvm/CodeGen/LiveRangeEdit.h | 7 | ||||
| -rw-r--r-- | llvm/lib/CodeGen/LiveRangeEdit.cpp | 10 |
2 files changed, 14 insertions, 3 deletions
diff --git a/llvm/include/llvm/CodeGen/LiveRangeEdit.h b/llvm/include/llvm/CodeGen/LiveRangeEdit.h index d0ed3ff..4db5e80 100644 --- a/llvm/include/llvm/CodeGen/LiveRangeEdit.h +++ b/llvm/include/llvm/CodeGen/LiveRangeEdit.h @@ -154,8 +154,11 @@ public: ArrayRef<Register> regs() const { return ArrayRef(NewRegs).slice(FirstNew); } - /// createFrom - Create a new virtual register based on OldReg. - Register createFrom(Register OldReg); + /// createFrom - Create a new virtual register based on OldReg. If \p RC is + /// non-null, constrain the register class of the new vreg. Partial reloads + /// of tuple regclasses will feed-in a subregclass derived from the regclass + /// of OldReg. + Register createFrom(Register OldReg, const TargetRegisterClass *RC = nullptr); /// create - Create a new register with the same class and original slot as /// parent. diff --git a/llvm/lib/CodeGen/LiveRangeEdit.cpp b/llvm/lib/CodeGen/LiveRangeEdit.cpp index 6fe1170..d8a2ad4 100644 --- a/llvm/lib/CodeGen/LiveRangeEdit.cpp +++ b/llvm/lib/CodeGen/LiveRangeEdit.cpp @@ -52,8 +52,16 @@ LiveInterval &LiveRangeEdit::createEmptyIntervalFrom(Register OldReg, return LI; } -Register LiveRangeEdit::createFrom(Register OldReg) { +Register LiveRangeEdit::createFrom(Register OldReg, + const TargetRegisterClass *RC) { Register VReg = MRI.cloneVirtualRegister(OldReg); + + // If RC is given, set it now. This is needed for cloning a new VReg with a + // smaller RC from its original virtual register, mainly used for subreg + // reload. The cloning is done first to ensure the vreg flags are preserved. + if (RC) + MRI.setRegClass(VReg, RC); + if (VRM) { VRM->setIsSplitFromReg(VReg, VRM->getOriginal(OldReg)); } |