mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-18 12:29:21 +00:00
Implement add.ll:test22, a common case in MSIL files
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14587 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
parent
80fc86a0b2
commit
46238a6150
@ -122,6 +122,7 @@ namespace {
|
||||
Instruction *visitFreeInst(FreeInst &FI);
|
||||
Instruction *visitLoadInst(LoadInst &LI);
|
||||
Instruction *visitBranchInst(BranchInst &BI);
|
||||
Instruction *visitSwitchInst(SwitchInst &SI);
|
||||
|
||||
// visitInstruction - Specify what to return for unhandled instructions...
|
||||
Instruction *visitInstruction(Instruction &I) { return 0; }
|
||||
@ -3004,6 +3005,23 @@ Instruction *InstCombiner::visitBranchInst(BranchInst &BI) {
|
||||
return 0;
|
||||
}
|
||||
|
||||
Instruction *InstCombiner::visitSwitchInst(SwitchInst &SI) {
|
||||
Value *Cond = SI.getCondition();
|
||||
if (Instruction *I = dyn_cast<Instruction>(Cond)) {
|
||||
if (I->getOpcode() == Instruction::Add)
|
||||
if (ConstantInt *AddRHS = dyn_cast<ConstantInt>(I->getOperand(1))) {
|
||||
// change 'switch (X+4) case 1:' into 'switch (X) case -3'
|
||||
for (unsigned i = 2, e = SI.getNumOperands(); i != e; i += 2)
|
||||
SI.setOperand(i, ConstantExpr::getSub(cast<Constant>(SI.getOperand(i)),
|
||||
AddRHS));
|
||||
SI.setOperand(0, I->getOperand(0));
|
||||
WorkList.push_back(I);
|
||||
return &SI;
|
||||
}
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
void InstCombiner::removeFromWorkList(Instruction *I) {
|
||||
WorkList.erase(std::remove(WorkList.begin(), WorkList.end(), I),
|
||||
|
Loading…
Reference in New Issue
Block a user