6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-07-25 13:24:46 +00:00
Code Issues Projects Releases Wiki Activity

Implicit def instructions, e.g. X86::IMPLICIT_DEF_GR32, are always re-materializable and they should not be spilled.

Browse Source 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44960 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2007-12-12 23:12:09 +00:00
parent 67f1c493d1
commit 6e141fd048
15 changed files with 724 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files

18
lib/CodeGen/LiveIntervalAnalysis.cpp
View File

@@ -613,8 +613,10 @@ bool LiveIntervals::isReMaterializable(const LiveInterval &li,
return false;
isLoad = false;
if (tii_->isTriviallyReMaterializable(MI)) {
isLoad = MI->getInstrDescriptor()->Flags & M_LOAD_FLAG;
const TargetInstrDescriptor *TID = MI->getInstrDescriptor();
if ((TID->Flags & M_IMPLICIT_DEF_FLAG) ||
tii_->isTriviallyReMaterializable(MI)) {
isLoad = TID->Flags & M_LOAD_FLAG;
return true;
}
@@ -677,6 +679,15 @@ bool LiveIntervals::tryFoldMemoryOperand(MachineInstr* &MI,
bool isSS, int Slot, unsigned Reg) {
unsigned MRInfo = 0;
const TargetInstrDescriptor *TID = MI->getInstrDescriptor();
// If it is an implicit def instruction, just delete it.
if (TID->Flags & M_IMPLICIT_DEF_FLAG) {
RemoveMachineInstrFromMaps(MI);
vrm.RemoveMachineInstrFromMaps(MI);
MI->eraseFromParent();
++numFolds;
return true;
}
SmallVector<unsigned, 2> FoldOps;
for (unsigned i = 0, e = Ops.size(); i != e; ++i) {
unsigned OpIdx = Ops[i];
@@ -852,7 +863,8 @@ rewriteInstructionForSpills(const LiveInterval &li, bool TrySplit,
} else {
CanFold = canFoldMemoryOperand(MI, Ops);
}
} else CanFold = false;
} else
CanFold = false;
// Create a new virtual register for the spill interval.
bool CreatedNewVReg = false;