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- Removing the infamous r2rMap_ and rep() method. Now the coalescer will update

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register defs and uses after each successful coalescing.
- Also removed a number of hacks and fixed some subtle kill information bugs.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47167 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2008-02-15 18:24:29 +00:00
parent f20db15954
commit c8d044e4f7
6 changed files with 328 additions and 403 deletions
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35
include/llvm/CodeGen/LiveInterval.h
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@ -37,19 +37,18 @@ namespace llvm {
/// merge point), it contains ~0u,x. If the value number is not in use, it
/// contains ~1u,x to indicate that the value # is not used.
/// def - Instruction # of the definition.
/// reg - Source reg iff val# is defined by a copy; zero otherwise.
/// copy - Copy iff val# is defined by a copy; zero otherwise.
/// hasPHIKill - One or more of the kills are PHI nodes.
/// kills - Instruction # of the kills. If a kill is an odd #, it means
/// the kill is a phi join point.
/// kills - Instruction # of the kills.
struct VNInfo {
unsigned id;
unsigned def;
unsigned reg;
MachineInstr *copy;
bool hasPHIKill;
SmallVector<unsigned, 4> kills;
VNInfo() : id(~1U), def(~1U), reg(0), hasPHIKill(false) {}
VNInfo(unsigned i, unsigned d, unsigned r)
: id(i), def(d), reg(r), hasPHIKill(false) {}
VNInfo() : id(~1U), def(~1U), copy(0), hasPHIKill(false) {}
VNInfo(unsigned i, unsigned d, MachineInstr *c)
: id(i), def(d), copy(c), hasPHIKill(false) {}
};
/// LiveRange structure - This represents a simple register range in the
@ -159,14 +158,14 @@ namespace llvm {
/// another.
void copyValNumInfo(VNInfo *DstValNo, const VNInfo *SrcValNo) {
DstValNo->def = SrcValNo->def;
DstValNo->reg = SrcValNo->reg;
DstValNo->copy = SrcValNo->copy;
DstValNo->hasPHIKill = SrcValNo->hasPHIKill;
DstValNo->kills = SrcValNo->kills;
}
/// getNextValue - Create a new value number and return it. MIIdx specifies
/// the instruction that defines the value number.
VNInfo *getNextValue(unsigned MIIdx, unsigned SrcReg,
VNInfo *getNextValue(unsigned MIIdx, MachineInstr *CopyMI,
BumpPtrAllocator &VNInfoAllocator) {
#ifdef __GNUC__
unsigned Alignment = __alignof__(VNInfo);
@ -176,7 +175,7 @@ namespace llvm {
#endif
VNInfo *VNI= static_cast<VNInfo*>(VNInfoAllocator.Allocate(sizeof(VNInfo),
Alignment));
new (VNI) VNInfo(valnos.size(), MIIdx, SrcReg);
new (VNI) VNInfo(valnos.size(), MIIdx, CopyMI);
valnos.push_back(VNI);
return VNI;
}
@ -199,7 +198,7 @@ namespace llvm {
void addKills(VNInfo *VNI, const SmallVector<unsigned, 4> &kills) {
for (unsigned i = 0, e = kills.size(); i != e; ++i) {
unsigned KillIdx = kills[i];
if (!liveAt(KillIdx)) {
if (!liveBeforeAndAt(KillIdx)) {
SmallVector<unsigned, 4>::iterator
I = std::lower_bound(VNI->kills.begin(), VNI->kills.end(), KillIdx);
VNI->kills.insert(I, KillIdx);
@ -230,6 +229,15 @@ namespace llvm {
E = std::upper_bound(kills.begin(), kills.end(), End);
kills.erase(I, E);
}
/// isKill - Return true if the specified index is a kill of the
/// specified val#.
bool isKill(const VNInfo *VNI, unsigned KillIdx) const {
const SmallVector<unsigned, 4> &kills = VNI->kills;
SmallVector<unsigned, 4>::const_iterator
I = std::lower_bound(kills.begin(), kills.end(), KillIdx);
return I != kills.end() && *I == KillIdx;
}
/// MergeValueNumberInto - This method is called when two value nubmers
/// are found to be equivalent. This eliminates V1, replacing all
@ -284,6 +292,11 @@ namespace llvm {
bool liveAt(unsigned index) const;
// liveBeforeAndAt - Check if the interval is live at the index and the
// index just before it. If index is liveAt, check if it starts a new live
// range.If it does, then check if the previous live range ends at index-1.
bool liveBeforeAndAt(unsigned index) const;
/// getLiveRangeContaining - Return the live range that contains the
/// specified index, or null if there is none.
const LiveRange *getLiveRangeContaining(unsigned Idx) const {