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author | Andrew Trick <atrick@apple.com> | 2012-02-21 04:51:23 +0000 |
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committer | Andrew Trick <atrick@apple.com> | 2012-02-21 04:51:23 +0000 |
commit | 19273aec441411b4d571fdb87c6daa0fbe7a33a0 (patch) | |
tree | ea01b1d19560a814c4686c3edebacac5b9e40f06 /lib/CodeGen/MachineRegisterInfo.cpp | |
parent | e8ccb049136506cb71b84a55000bad3c1440ee7c (diff) | |
download | external_llvm-19273aec441411b4d571fdb87c6daa0fbe7a33a0.zip external_llvm-19273aec441411b4d571fdb87c6daa0fbe7a33a0.tar.gz external_llvm-19273aec441411b4d571fdb87c6daa0fbe7a33a0.tar.bz2 |
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.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151032 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/MachineRegisterInfo.cpp')
-rw-r--r-- | lib/CodeGen/MachineRegisterInfo.cpp | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/lib/CodeGen/MachineRegisterInfo.cpp b/lib/CodeGen/MachineRegisterInfo.cpp index 08bf1ae..984112f 100644 --- a/lib/CodeGen/MachineRegisterInfo.cpp +++ b/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. |