From da84e6468304500dc65813aee8728bee18ac6578 Mon Sep 17 00:00:00 2001 From: Andrew Trick Date: Tue, 21 Feb 2012 04:51:23 +0000 Subject: Clear virtual registers after they are no longer referenced. Passes after RegAlloc should be able to rely on MRI->getNumVirtRegs() == 0. This makes sharing code for pre/postRA passes more robust. Now, to check if a pass is running before the RA pipeline begins, use MRI->isSSA(). To check if a pass is running after the RA pipeline ends, use !MRI->getNumVirtRegs(). PEI resets virtual regs when it's done scavenging. PTX will either have to provide its own PEI pass or assign physregs. llvm-svn: 151032 --- llvm/lib/CodeGen/MachineRegisterInfo.cpp | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-) (limited to 'llvm/lib/CodeGen/MachineRegisterInfo.cpp') diff --git a/llvm/lib/CodeGen/MachineRegisterInfo.cpp b/llvm/lib/CodeGen/MachineRegisterInfo.cpp index 08bf1ae91066..984112ff726b 100644 --- a/llvm/lib/CodeGen/MachineRegisterInfo.cpp +++ b/llvm/lib/CodeGen/MachineRegisterInfo.cpp @@ -31,9 +31,7 @@ MachineRegisterInfo::MachineRegisterInfo(const TargetRegisterInfo &TRI) MachineRegisterInfo::~MachineRegisterInfo() { #ifndef NDEBUG - for (unsigned i = 0, e = getNumVirtRegs(); i != e; ++i) - assert(VRegInfo[TargetRegisterInfo::index2VirtReg(i)].second == 0 && - "Vreg use list non-empty still?"); + clearVirtRegs(); for (unsigned i = 0, e = UsedPhysRegs.size(); i != e; ++i) assert(!PhysRegUseDefLists[i] && "PhysRegUseDefLists has entries after all instructions are deleted"); @@ -118,6 +116,16 @@ MachineRegisterInfo::createVirtualRegister(const TargetRegisterClass *RegClass){ return Reg; } +/// clearVirtRegs - Remove all virtual registers (after physreg assignment). +void MachineRegisterInfo::clearVirtRegs() { +#ifndef NDEBUG + for (unsigned i = 0, e = getNumVirtRegs(); i != e; ++i) + assert(VRegInfo[TargetRegisterInfo::index2VirtReg(i)].second == 0 && + "Vreg use list non-empty still?"); +#endif + VRegInfo.clear(); +} + /// HandleVRegListReallocation - We just added a virtual register to the /// VRegInfo info list and it reallocated. Update the use/def lists info /// pointers. -- cgit v1.2.3