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use 'match' for less indenting; NFCI

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llvm-svn: 269494
This commit is contained in:
Sanjay Patel 2016-05-13 21:51:17 +00:00
parent b1f881cc44
commit 68b6b9da9e
1 changed files with 20 additions and 21 deletions
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41
lib/Transforms/InstCombine/InstructionCombining.cpp
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@ -2213,28 +2213,27 @@ Instruction *InstCombiner::visitSwitchInst(SwitchInst &SI) {
SI.getContext(), C.getCaseValue()->getValue().trunc(NewWidth)));
}
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'
// Skip the first item since that's the default case.
for (SwitchInst::CaseIt i = SI.case_begin(), e = SI.case_end();
i != e; ++i) {
ConstantInt* CaseVal = i.getCaseValue();
Constant *LHS = CaseVal;
if (TruncCond)
LHS = LeadingKnownZeros
? ConstantExpr::getZExt(CaseVal, Cond->getType())
: ConstantExpr::getSExt(CaseVal, Cond->getType());
Constant* NewCaseVal = ConstantExpr::getSub(LHS, AddRHS);
assert(isa<ConstantInt>(NewCaseVal) &&
"Result of expression should be constant");
i.setValue(cast<ConstantInt>(NewCaseVal));
}
SI.setCondition(I->getOperand(0));
Worklist.Add(I);
return &SI;
ConstantInt *AddRHS = nullptr;
if (match(Cond, m_Add(m_Value(), m_ConstantInt(AddRHS)))) {
Instruction *I = cast<Instruction>(Cond);
// Change 'switch (X+4) case 1:' into 'switch (X) case -3'.
for (SwitchInst::CaseIt i = SI.case_begin(), e = SI.case_end(); i != e;
++i) {
ConstantInt *CaseVal = i.getCaseValue();
Constant *LHS = CaseVal;
if (TruncCond) {
LHS = LeadingKnownZeros
? ConstantExpr::getZExt(CaseVal, Cond->getType())
: ConstantExpr::getSExt(CaseVal, Cond->getType());
}
Constant *NewCaseVal = ConstantExpr::getSub(LHS, AddRHS);
assert(isa<ConstantInt>(NewCaseVal) &&
"Result of expression should be constant");
i.setValue(cast<ConstantInt>(NewCaseVal));
}
SI.setCondition(I->getOperand(0));
Worklist.Add(I);
return &SI;
}
return TruncCond ? &SI : nullptr;