RPCS3/llvm-mirror
1
0
Fork 0
mirror of https://github.com/RPCS3/llvm-mirror.git synced 2025-03-05 19:10:19 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

Use VirtRegMap's Virt2SplitMap to keep track of the original live range before splitting.

Browse Source 
All new virtual registers created for spilling or splitting point back to their original.

llvm-svn: 125980
This commit is contained in:
Jakob Stoklund Olesen 2011-02-18 22:35:20 +00:00
parent a0dede2c21
commit 0dd5f07ac0
3 changed files with 12 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
lib/CodeGen/LiveRangeEdit.cpp
View File

@ -19,12 +19,18 @@
using namespace llvm;
unsigned LiveRangeEdit::getOriginal(const VirtRegMap &vrm) const {
unsigned Orig = vrm.getPreSplitReg(getReg());
return Orig ? Orig : getReg();
}
LiveInterval &LiveRangeEdit::create(MachineRegisterInfo &mri,
LiveIntervals &lis,
VirtRegMap &vrm) {
const TargetRegisterClass *RC = mri.getRegClass(parent_.reg);
const TargetRegisterClass *RC = mri.getRegClass(getReg());
unsigned VReg = mri.createVirtualRegister(RC);
vrm.grow();
vrm.setIsSplitFromReg(VReg, getOriginal(vrm));
LiveInterval &li = lis.getOrCreateInterval(VReg);
newRegs_.push_back(&li);
return li;

4
lib/CodeGen/LiveRangeEdit.h
View File

@ -73,6 +73,10 @@ public:
LiveInterval &getParent() const { return parent_; }
unsigned getReg() const { return parent_.reg; }
/// getOriginal - Return the original virtual register that parent descends
/// from through splitting. The original was not created by splitting.
unsigned getOriginal(const VirtRegMap&) const;
/// Iterator for accessing the new registers added by this edit.
typedef SmallVectorImpl<LiveInterval*>::const_iterator iterator;
iterator begin() const { return newRegs_.begin()+firstNew_; }

2
lib/CodeGen/VirtRegMap.h
View File

@ -214,7 +214,7 @@ namespace llvm {
}
/// @brief returns the live interval virtReg is split from.
unsigned getPreSplitReg(unsigned virtReg) {
unsigned getPreSplitReg(unsigned virtReg) const {
return Virt2SplitMap[virtReg];
}