/// new ICmp instruction. The sign is passed in to determine which kind
/// of predicate to use in the new icmp instruction.
static Value *getICmpValue(bool Sign, unsigned Code, Value *LHS, Value *RHS) {
+ CmpInst::Predicate Pred;
switch (Code) {
default: assert(0 && "Illegal ICmp code!");
- case 0:
- return ConstantInt::getFalse(LHS->getContext());
- case 1:
- if (Sign)
- return new ICmpInst(ICmpInst::ICMP_SGT, LHS, RHS);
- return new ICmpInst(ICmpInst::ICMP_UGT, LHS, RHS);
- case 2:
- return new ICmpInst(ICmpInst::ICMP_EQ, LHS, RHS);
- case 3:
- if (Sign)
- return new ICmpInst(ICmpInst::ICMP_SGE, LHS, RHS);
- return new ICmpInst(ICmpInst::ICMP_UGE, LHS, RHS);
- case 4:
- if (Sign)
- return new ICmpInst(ICmpInst::ICMP_SLT, LHS, RHS);
- return new ICmpInst(ICmpInst::ICMP_ULT, LHS, RHS);
- case 5:
- return new ICmpInst(ICmpInst::ICMP_NE, LHS, RHS);
- case 6:
- if (Sign)
- return new ICmpInst(ICmpInst::ICMP_SLE, LHS, RHS);
- return new ICmpInst(ICmpInst::ICMP_ULE, LHS, RHS);
- case 7:
- return ConstantInt::getTrue(LHS->getContext());
+ case 0: // False.
+ return ConstantInt::get(CmpInst::makeCmpResultType(LHS->getType()), 0);
+ case 1: Pred = Sign ? ICmpInst::ICMP_SGT : ICmpInst::ICMP_UGT; break;
+ case 2: Pred = ICmpInst::ICMP_EQ; break;
+ case 3: Pred = Sign ? ICmpInst::ICMP_SGE : ICmpInst::ICMP_UGE; break;
+ case 4: Pred = Sign ? ICmpInst::ICMP_SLT : ICmpInst::ICMP_ULT; break;
+ case 5: Pred = ICmpInst::ICMP_NE; break;
+ case 6: Pred = Sign ? ICmpInst::ICMP_SLE : ICmpInst::ICMP_ULE; break;
+ case 7: // True.
+ return ConstantInt::get(CmpInst::makeCmpResultType(LHS->getType()), 1);
}
+ return new ICmpInst(Pred, LHS, RHS);
}
/// getFCmpValue - This is the complement of getFCmpCode, which turns an
/// in to determine which kind of predicate to use in the new fcmp instruction.
static Value *getFCmpValue(bool isordered, unsigned code,
Value *LHS, Value *RHS) {
+ CmpInst::Predicate Pred;
switch (code) {
- default: llvm_unreachable("Illegal FCmp code!");
- case 0:
- if (isordered)
- return new FCmpInst(FCmpInst::FCMP_ORD, LHS, RHS);
- else
- return new FCmpInst(FCmpInst::FCMP_UNO, LHS, RHS);
- case 1:
- if (isordered)
- return new FCmpInst(FCmpInst::FCMP_OGT, LHS, RHS);
- else
- return new FCmpInst(FCmpInst::FCMP_UGT, LHS, RHS);
- case 2:
- if (isordered)
- return new FCmpInst(FCmpInst::FCMP_OEQ, LHS, RHS);
- else
- return new FCmpInst(FCmpInst::FCMP_UEQ, LHS, RHS);
- case 3:
- if (isordered)
- return new FCmpInst(FCmpInst::FCMP_OGE, LHS, RHS);
- else
- return new FCmpInst(FCmpInst::FCMP_UGE, LHS, RHS);
- case 4:
- if (isordered)
- return new FCmpInst(FCmpInst::FCMP_OLT, LHS, RHS);
- else
- return new FCmpInst(FCmpInst::FCMP_ULT, LHS, RHS);
- case 5:
- if (isordered)
- return new FCmpInst(FCmpInst::FCMP_ONE, LHS, RHS);
- else
- return new FCmpInst(FCmpInst::FCMP_UNE, LHS, RHS);
- case 6:
- if (isordered)
- return new FCmpInst(FCmpInst::FCMP_OLE, LHS, RHS);
- else
- return new FCmpInst(FCmpInst::FCMP_ULE, LHS, RHS);
- case 7: return ConstantInt::getTrue(LHS->getContext());
+ default: assert(0 && "Illegal FCmp code!");
+ case 0: Pred = isordered ? FCmpInst::FCMP_ORD : FCmpInst::FCMP_UNO; break;
+ case 1: Pred = isordered ? FCmpInst::FCMP_OGT : FCmpInst::FCMP_UGT; break;
+ case 2: Pred = isordered ? FCmpInst::FCMP_OEQ : FCmpInst::FCMP_UEQ; break;
+ case 3: Pred = isordered ? FCmpInst::FCMP_OGE : FCmpInst::FCMP_UGE; break;
+ case 4: Pred = isordered ? FCmpInst::FCMP_OLT : FCmpInst::FCMP_ULT; break;
+ case 5: Pred = isordered ? FCmpInst::FCMP_ONE : FCmpInst::FCMP_UNE; break;
+ case 6: Pred = isordered ? FCmpInst::FCMP_OLE : FCmpInst::FCMP_ULE; break;
+ case 7: return ConstantInt::getTrue(LHS->getContext());
}
+ return new FCmpInst(Pred, LHS, RHS);
}
/// PredicatesFoldable - Return true if both predicates match sign or if at
return 0;
}
-/// FoldOrOfICmps - Fold (icmp)|(icmp) if possible.
+/// FoldOrOfICmps - Fold (icmp)|(icmp) and (cast (icmp))|(cast (icmp)) if
+/// possible.
Instruction *InstCombiner::FoldOrOfICmps(Instruction &I,
ICmpInst *LHS, ICmpInst *RHS) {
ICmpInst::Predicate LHSCC = LHS->getPredicate(), RHSCC = RHS->getPredicate();