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author | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2012-08-09 22:49:37 +0000 |
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committer | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2012-08-09 22:49:37 +0000 |
commit | ff2b99afc8cbc6cfa73181072888e0f9f07deb7e (patch) | |
tree | 05569eb1e6e4b27731f81088a79f4290d3cf4ac5 /lib/CodeGen/MachineRegisterInfo.cpp | |
parent | df1c637ac4b6f6587c037be55cafed665c732d8f (diff) | |
download | llvm-ff2b99afc8cbc6cfa73181072888e0f9f07deb7e.tar.gz llvm-ff2b99afc8cbc6cfa73181072888e0f9f07deb7e.tar.bz2 llvm-ff2b99afc8cbc6cfa73181072888e0f9f07deb7e.tar.xz |
Move use list management into MachineRegisterInfo.
Register MachineOperands are kept in linked lists accessible via MRI's
reg_iterator interfaces. The linked list management was handled partly
by MachineOperand methods, partly by MRI methods.
Move all of the list management into MRI, delete
MO::AddRegOperandToRegInfo() and MO::RemoveRegOperandFromRegInfo().
Be more explicit about handling the cases where an MRI pointer isn't
available.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161632 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/MachineRegisterInfo.cpp')
-rw-r--r-- | lib/CodeGen/MachineRegisterInfo.cpp | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/lib/CodeGen/MachineRegisterInfo.cpp b/lib/CodeGen/MachineRegisterInfo.cpp index 3a4eb8c967..6d05d35d7a 100644 --- a/lib/CodeGen/MachineRegisterInfo.cpp +++ b/lib/CodeGen/MachineRegisterInfo.cpp @@ -126,6 +126,43 @@ void MachineRegisterInfo::clearVirtRegs() { VRegInfo.clear(); } +/// Add MO to the linked list of operands for its register. +void MachineRegisterInfo::addRegOperandToUseList(MachineOperand *MO) { + assert(!MO->isOnRegUseList() && "Already on list"); + MachineOperand **Head = &getRegUseDefListHead(MO->getReg()); + + // For SSA values, we prefer to keep the definition at the start of the list. + // we do this by skipping over the definition if it is at the head of the + // list. + if (*Head && (*Head)->isDef()) + Head = &(*Head)->Contents.Reg.Next; + + MO->Contents.Reg.Next = *Head; + if (MO->Contents.Reg.Next) { + assert(MO->getReg() == MO->Contents.Reg.Next->getReg() && + "Different regs on the same list!"); + MO->Contents.Reg.Next->Contents.Reg.Prev = &MO->Contents.Reg.Next; + } + + MO->Contents.Reg.Prev = Head; + *Head = MO; +} + +/// Remove MO from its use-def list. +void MachineRegisterInfo::removeRegOperandFromUseList(MachineOperand *MO) { + assert(MO->isOnRegUseList() && "Operand not on use list"); + + // Unlink this from the doubly linked list of operands. + MachineOperand *NextOp = MO->Contents.Reg.Next; + *MO->Contents.Reg.Prev = NextOp; + if (NextOp) { + assert(NextOp->getReg() == MO->getReg() && "Corrupt reg use/def chain!"); + NextOp->Contents.Reg.Prev = MO->Contents.Reg.Prev; + } + MO->Contents.Reg.Prev = 0; + MO->Contents.Reg.Next = 0; +} + /// HandleVRegListReallocation - We just added a virtual register to the /// VRegInfo info list and it reallocated. Update the use/def lists info /// pointers. |