From 8c08d8c77c45d4721e7d3ef746cca9e39b28e379 Mon Sep 17 00:00:00 2001 From: Evan Cheng Date: Fri, 23 Jan 2009 02:15:19 +0000 Subject: Cross register class coalescing. Not yet enabled. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@62832 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/CodeGen/SimpleRegisterCoalescing.h | 23 ++++++++--------------- 1 file changed, 8 insertions(+), 15 deletions(-) (limited to 'lib/CodeGen/SimpleRegisterCoalescing.h') diff --git a/lib/CodeGen/SimpleRegisterCoalescing.h b/lib/CodeGen/SimpleRegisterCoalescing.h index a4f0fa3..cce5ceb 100644 --- a/lib/CodeGen/SimpleRegisterCoalescing.h +++ b/lib/CodeGen/SimpleRegisterCoalescing.h @@ -173,12 +173,8 @@ namespace llvm { bool SimpleJoin(LiveInterval &LHS, LiveInterval &RHS); /// Return true if the two specified registers belong to different register - /// classes. The registers may be either phys or virt regs. In the - /// case where both registers are virtual registers, it would also returns - /// true by reference the RegB register class in SubRC if it is a subset of - /// RegA's register class. - bool differingRegisterClasses(unsigned RegA, unsigned RegB, - const TargetRegisterClass *&SubRC) const; + /// classes. The registers may be either phys or virt regs. + bool differingRegisterClasses(unsigned RegA, unsigned RegB) const; /// AdjustCopiesBackFrom - We found a non-trivially-coalescable copy. If @@ -219,11 +215,10 @@ namespace llvm { /// identity copies so they will be removed. void RemoveCopiesFromValNo(LiveInterval &li, VNInfo *VNI); - /// isProfitableToCoalesceToSubRC - Given that register class of DstReg is - /// a subset of the register class of SrcReg, return true if it's profitable - /// to coalesce the two registers. - bool isProfitableToCoalesceToSubRC(unsigned SrcReg, unsigned DstReg, - MachineBasicBlock *MBB); + /// isWinToJoinCrossClass - Return true if it's profitable to coalesce + /// two virtual registers from different register classes. + bool isWinToJoinCrossClass(unsigned LargeReg, unsigned SmallReg, + unsigned Threshold); /// HasIncompatibleSubRegDefUse - If we are trying to coalesce a virtual /// register with a physical register, check if any of the virtual register @@ -235,15 +230,13 @@ namespace llvm { /// CanJoinExtractSubRegToPhysReg - Return true if it's possible to coalesce /// an extract_subreg where dst is a physical register, e.g. /// cl = EXTRACT_SUBREG reg1024, 1 - bool CanJoinExtractSubRegToPhysReg(MachineInstr *CopyMI, - unsigned DstReg, unsigned SrcReg, + bool CanJoinExtractSubRegToPhysReg(unsigned DstReg, unsigned SrcReg, unsigned SubIdx, unsigned &RealDstReg); /// CanJoinInsertSubRegToPhysReg - Return true if it's possible to coalesce /// an insert_subreg where src is a physical register, e.g. /// reg1024 = INSERT_SUBREG reg1024, c1, 0 - bool CanJoinInsertSubRegToPhysReg(MachineInstr *CopyMI, - unsigned DstReg, unsigned SrcReg, + bool CanJoinInsertSubRegToPhysReg(unsigned DstReg, unsigned SrcReg, unsigned SubIdx, unsigned &RealDstReg); /// RangeIsDefinedByCopyFromReg - Return true if the specified live range of -- cgit v1.1