mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-16 11:30:51 +00:00
factor a whole bunch of code out into a helper function.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@59398 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
parent
b9553d693b
commit
29cd5ba621
@ -180,6 +180,7 @@ namespace {
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Instruction *visitUDiv(BinaryOperator &I);
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Instruction *visitSDiv(BinaryOperator &I);
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Instruction *visitFDiv(BinaryOperator &I);
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Instruction *FoldAndOfICmps(Instruction &I, ICmpInst *LHS, ICmpInst *RHS);
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Instruction *visitAnd(BinaryOperator &I);
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Instruction *visitOr (BinaryOperator &I);
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Instruction *visitXor(BinaryOperator &I);
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@ -3552,6 +3553,168 @@ Value *InstCombiner::FoldLogicalPlusAnd(Value *LHS, Value *RHS,
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return InsertNewInstBefore(New, I);
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}
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/// FoldAndOfICmps - Fold (icmp)&(icmp) if possible.
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Instruction *InstCombiner::FoldAndOfICmps(Instruction &I,
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ICmpInst *LHS, ICmpInst *RHS) {
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Value *Val;
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ConstantInt *LHSCst, *RHSCst;
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ICmpInst::Predicate LHSCC, RHSCC;
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// (icmp1 A, C1) & (icmp2 A, C2) --> something simpler.
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if (!match(LHS, m_ICmp(LHSCC, m_Value(Val), m_ConstantInt(LHSCst))) ||
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!match(RHS, m_ICmp(RHSCC, m_Specific(Val), m_ConstantInt(RHSCst))))
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return 0;
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// ICMP_[US][GL]E X, CST is folded to ICMP_[US][GL]T elsewhere.
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if (LHSCC == ICmpInst::ICMP_UGE || LHSCC == ICmpInst::ICMP_ULE ||
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RHSCC == ICmpInst::ICMP_UGE || RHSCC == ICmpInst::ICMP_ULE ||
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LHSCC == ICmpInst::ICMP_SGE || LHSCC == ICmpInst::ICMP_SLE ||
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RHSCC == ICmpInst::ICMP_SGE || RHSCC == ICmpInst::ICMP_SLE)
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return 0;
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// We can't fold (ugt x, C) & (sgt x, C2).
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if (!PredicatesFoldable(LHSCC, RHSCC))
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return 0;
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// Ensure that the larger constant is on the RHS.
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ICmpInst::Predicate GT;
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if (ICmpInst::isSignedPredicate(LHSCC) ||
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(ICmpInst::isEquality(LHSCC) &&
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ICmpInst::isSignedPredicate(RHSCC)))
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GT = ICmpInst::ICMP_SGT;
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else
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GT = ICmpInst::ICMP_UGT;
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Constant *Cmp = ConstantExpr::getICmp(GT, LHSCst, RHSCst);
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if (cast<ConstantInt>(Cmp)->getZExtValue()) {
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std::swap(LHS, RHS);
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std::swap(LHSCst, RHSCst);
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std::swap(LHSCC, RHSCC);
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}
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// At this point, we know we have have two icmp instructions
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// comparing a value against two constants and and'ing the result
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// together. Because of the above check, we know that we only have
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// icmp eq, icmp ne, icmp [su]lt, and icmp [SU]gt here. We also know
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// (from the FoldICmpLogical check above), that the two constants
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// are not equal and that the larger constant is on the RHS
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assert(LHSCst != RHSCst && "Compares not folded above?");
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switch (LHSCC) {
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default: assert(0 && "Unknown integer condition code!");
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case ICmpInst::ICMP_EQ:
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switch (RHSCC) {
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default: assert(0 && "Unknown integer condition code!");
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case ICmpInst::ICMP_EQ: // (X == 13 & X == 15) -> false
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case ICmpInst::ICMP_UGT: // (X == 13 & X > 15) -> false
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case ICmpInst::ICMP_SGT: // (X == 13 & X > 15) -> false
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return ReplaceInstUsesWith(I, ConstantInt::getFalse());
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case ICmpInst::ICMP_NE: // (X == 13 & X != 15) -> X == 13
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case ICmpInst::ICMP_ULT: // (X == 13 & X < 15) -> X == 13
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case ICmpInst::ICMP_SLT: // (X == 13 & X < 15) -> X == 13
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return ReplaceInstUsesWith(I, LHS);
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}
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case ICmpInst::ICMP_NE:
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switch (RHSCC) {
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default: assert(0 && "Unknown integer condition code!");
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case ICmpInst::ICMP_ULT:
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if (LHSCst == SubOne(RHSCst)) // (X != 13 & X u< 14) -> X < 13
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return new ICmpInst(ICmpInst::ICMP_ULT, Val, LHSCst);
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break; // (X != 13 & X u< 15) -> no change
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case ICmpInst::ICMP_SLT:
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if (LHSCst == SubOne(RHSCst)) // (X != 13 & X s< 14) -> X < 13
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return new ICmpInst(ICmpInst::ICMP_SLT, Val, LHSCst);
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break; // (X != 13 & X s< 15) -> no change
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case ICmpInst::ICMP_EQ: // (X != 13 & X == 15) -> X == 15
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case ICmpInst::ICMP_UGT: // (X != 13 & X u> 15) -> X u> 15
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case ICmpInst::ICMP_SGT: // (X != 13 & X s> 15) -> X s> 15
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return ReplaceInstUsesWith(I, RHS);
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case ICmpInst::ICMP_NE:
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if (LHSCst == SubOne(RHSCst)){// (X != 13 & X != 14) -> X-13 >u 1
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Constant *AddCST = ConstantExpr::getNeg(LHSCst);
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Instruction *Add = BinaryOperator::CreateAdd(Val, AddCST,
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Val->getName()+".off");
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InsertNewInstBefore(Add, I);
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return new ICmpInst(ICmpInst::ICMP_UGT, Add,
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ConstantInt::get(Add->getType(), 1));
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}
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break; // (X != 13 & X != 15) -> no change
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}
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break;
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case ICmpInst::ICMP_ULT:
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switch (RHSCC) {
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default: assert(0 && "Unknown integer condition code!");
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case ICmpInst::ICMP_EQ: // (X u< 13 & X == 15) -> false
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case ICmpInst::ICMP_UGT: // (X u< 13 & X u> 15) -> false
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return ReplaceInstUsesWith(I, ConstantInt::getFalse());
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case ICmpInst::ICMP_SGT: // (X u< 13 & X s> 15) -> no change
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break;
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case ICmpInst::ICMP_NE: // (X u< 13 & X != 15) -> X u< 13
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case ICmpInst::ICMP_ULT: // (X u< 13 & X u< 15) -> X u< 13
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return ReplaceInstUsesWith(I, LHS);
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case ICmpInst::ICMP_SLT: // (X u< 13 & X s< 15) -> no change
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break;
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}
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break;
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case ICmpInst::ICMP_SLT:
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switch (RHSCC) {
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default: assert(0 && "Unknown integer condition code!");
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case ICmpInst::ICMP_EQ: // (X s< 13 & X == 15) -> false
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case ICmpInst::ICMP_SGT: // (X s< 13 & X s> 15) -> false
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return ReplaceInstUsesWith(I, ConstantInt::getFalse());
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case ICmpInst::ICMP_UGT: // (X s< 13 & X u> 15) -> no change
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break;
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case ICmpInst::ICMP_NE: // (X s< 13 & X != 15) -> X < 13
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case ICmpInst::ICMP_SLT: // (X s< 13 & X s< 15) -> X < 13
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return ReplaceInstUsesWith(I, LHS);
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case ICmpInst::ICMP_ULT: // (X s< 13 & X u< 15) -> no change
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break;
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}
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break;
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case ICmpInst::ICMP_UGT:
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switch (RHSCC) {
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default: assert(0 && "Unknown integer condition code!");
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case ICmpInst::ICMP_EQ: // (X u> 13 & X == 15) -> X == 15
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case ICmpInst::ICMP_UGT: // (X u> 13 & X u> 15) -> X u> 15
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return ReplaceInstUsesWith(I, RHS);
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case ICmpInst::ICMP_SGT: // (X u> 13 & X s> 15) -> no change
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break;
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case ICmpInst::ICMP_NE:
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if (RHSCst == AddOne(LHSCst)) // (X u> 13 & X != 14) -> X u> 14
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return new ICmpInst(LHSCC, Val, RHSCst);
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break; // (X u> 13 & X != 15) -> no change
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case ICmpInst::ICMP_ULT: // (X u> 13 & X u< 15) ->(X-14) <u 1
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return InsertRangeTest(Val, AddOne(LHSCst), RHSCst, false, true, I);
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case ICmpInst::ICMP_SLT: // (X u> 13 & X s< 15) -> no change
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break;
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}
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break;
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case ICmpInst::ICMP_SGT:
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switch (RHSCC) {
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default: assert(0 && "Unknown integer condition code!");
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case ICmpInst::ICMP_EQ: // (X s> 13 & X == 15) -> X == 15
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case ICmpInst::ICMP_SGT: // (X s> 13 & X s> 15) -> X s> 15
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return ReplaceInstUsesWith(I, RHS);
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case ICmpInst::ICMP_UGT: // (X s> 13 & X u> 15) -> no change
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break;
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case ICmpInst::ICMP_NE:
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if (RHSCst == AddOne(LHSCst)) // (X s> 13 & X != 14) -> X s> 14
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return new ICmpInst(LHSCC, Val, RHSCst);
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break; // (X s> 13 & X != 15) -> no change
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case ICmpInst::ICMP_SLT: // (X s> 13 & X s< 15) ->(X-14) s< 1
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return InsertRangeTest(Val, AddOne(LHSCst), RHSCst, true, true, I);
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case ICmpInst::ICMP_ULT: // (X s> 13 & X u< 15) -> no change
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break;
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}
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break;
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}
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return 0;
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}
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Instruction *InstCombiner::visitAnd(BinaryOperator &I) {
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bool Changed = SimplifyCommutative(I);
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Value *Op0 = I.getOperand(0), *Op1 = I.getOperand(1);
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@ -3789,155 +3952,9 @@ Instruction *InstCombiner::visitAnd(BinaryOperator &I) {
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if (Instruction *R = AssociativeOpt(I, FoldICmpLogical(*this, RHS)))
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return R;
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Value *Val;
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ConstantInt *LHSCst, *RHSCst;
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ICmpInst::Predicate LHSCC, RHSCC;
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// (icmp1 A, C1) & (icmp2 A, C2) --> something simpler.
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if (match(Op0, m_ICmp(LHSCC, m_Value(Val), m_ConstantInt(LHSCst))) &&
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match(RHS, m_ICmp(RHSCC, m_Specific(Val), m_ConstantInt(RHSCst))) &&
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// ICMP_[US][GL]E X, CST is folded to ICMP_[US][GL]T elsewhere.
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LHSCC != ICmpInst::ICMP_UGE && LHSCC != ICmpInst::ICMP_ULE &&
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RHSCC != ICmpInst::ICMP_UGE && RHSCC != ICmpInst::ICMP_ULE &&
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LHSCC != ICmpInst::ICMP_SGE && LHSCC != ICmpInst::ICMP_SLE &&
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RHSCC != ICmpInst::ICMP_SGE && RHSCC != ICmpInst::ICMP_SLE &&
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// We can't fold (ugt x, C) & (sgt x, C2).
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PredicatesFoldable(LHSCC, RHSCC)) {
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// Ensure that the larger constant is on the RHS.
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ICmpInst::Predicate GT;
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if (ICmpInst::isSignedPredicate(LHSCC) ||
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(ICmpInst::isEquality(LHSCC) &&
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ICmpInst::isSignedPredicate(RHSCC)))
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GT = ICmpInst::ICMP_SGT;
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else
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GT = ICmpInst::ICMP_UGT;
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Constant *Cmp = ConstantExpr::getICmp(GT, LHSCst, RHSCst);
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ICmpInst *LHS = cast<ICmpInst>(Op0);
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if (cast<ConstantInt>(Cmp)->getZExtValue()) {
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std::swap(LHS, RHS);
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std::swap(LHSCst, RHSCst);
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std::swap(LHSCC, RHSCC);
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}
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// At this point, we know we have have two icmp instructions
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// comparing a value against two constants and and'ing the result
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// together. Because of the above check, we know that we only have
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// icmp eq, icmp ne, icmp [su]lt, and icmp [SU]gt here. We also know
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// (from the FoldICmpLogical check above), that the two constants
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// are not equal and that the larger constant is on the RHS
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assert(LHSCst != RHSCst && "Compares not folded above?");
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switch (LHSCC) {
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default: assert(0 && "Unknown integer condition code!");
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case ICmpInst::ICMP_EQ:
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switch (RHSCC) {
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default: assert(0 && "Unknown integer condition code!");
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case ICmpInst::ICMP_EQ: // (X == 13 & X == 15) -> false
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case ICmpInst::ICMP_UGT: // (X == 13 & X > 15) -> false
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case ICmpInst::ICMP_SGT: // (X == 13 & X > 15) -> false
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return ReplaceInstUsesWith(I, ConstantInt::getFalse());
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case ICmpInst::ICMP_NE: // (X == 13 & X != 15) -> X == 13
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case ICmpInst::ICMP_ULT: // (X == 13 & X < 15) -> X == 13
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case ICmpInst::ICMP_SLT: // (X == 13 & X < 15) -> X == 13
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return ReplaceInstUsesWith(I, LHS);
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}
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case ICmpInst::ICMP_NE:
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switch (RHSCC) {
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default: assert(0 && "Unknown integer condition code!");
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case ICmpInst::ICMP_ULT:
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if (LHSCst == SubOne(RHSCst)) // (X != 13 & X u< 14) -> X < 13
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return new ICmpInst(ICmpInst::ICMP_ULT, Val, LHSCst);
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break; // (X != 13 & X u< 15) -> no change
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case ICmpInst::ICMP_SLT:
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if (LHSCst == SubOne(RHSCst)) // (X != 13 & X s< 14) -> X < 13
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return new ICmpInst(ICmpInst::ICMP_SLT, Val, LHSCst);
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break; // (X != 13 & X s< 15) -> no change
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case ICmpInst::ICMP_EQ: // (X != 13 & X == 15) -> X == 15
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case ICmpInst::ICMP_UGT: // (X != 13 & X u> 15) -> X u> 15
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case ICmpInst::ICMP_SGT: // (X != 13 & X s> 15) -> X s> 15
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return ReplaceInstUsesWith(I, RHS);
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case ICmpInst::ICMP_NE:
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if (LHSCst == SubOne(RHSCst)){// (X != 13 & X != 14) -> X-13 >u 1
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Constant *AddCST = ConstantExpr::getNeg(LHSCst);
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Instruction *Add = BinaryOperator::CreateAdd(Val, AddCST,
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Val->getName()+".off");
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InsertNewInstBefore(Add, I);
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return new ICmpInst(ICmpInst::ICMP_UGT, Add,
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ConstantInt::get(Add->getType(), 1));
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}
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break; // (X != 13 & X != 15) -> no change
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}
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break;
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case ICmpInst::ICMP_ULT:
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switch (RHSCC) {
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default: assert(0 && "Unknown integer condition code!");
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case ICmpInst::ICMP_EQ: // (X u< 13 & X == 15) -> false
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case ICmpInst::ICMP_UGT: // (X u< 13 & X u> 15) -> false
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return ReplaceInstUsesWith(I, ConstantInt::getFalse());
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case ICmpInst::ICMP_SGT: // (X u< 13 & X s> 15) -> no change
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break;
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case ICmpInst::ICMP_NE: // (X u< 13 & X != 15) -> X u< 13
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case ICmpInst::ICMP_ULT: // (X u< 13 & X u< 15) -> X u< 13
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return ReplaceInstUsesWith(I, LHS);
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case ICmpInst::ICMP_SLT: // (X u< 13 & X s< 15) -> no change
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break;
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}
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break;
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case ICmpInst::ICMP_SLT:
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switch (RHSCC) {
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default: assert(0 && "Unknown integer condition code!");
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case ICmpInst::ICMP_EQ: // (X s< 13 & X == 15) -> false
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case ICmpInst::ICMP_SGT: // (X s< 13 & X s> 15) -> false
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return ReplaceInstUsesWith(I, ConstantInt::getFalse());
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case ICmpInst::ICMP_UGT: // (X s< 13 & X u> 15) -> no change
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break;
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case ICmpInst::ICMP_NE: // (X s< 13 & X != 15) -> X < 13
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case ICmpInst::ICMP_SLT: // (X s< 13 & X s< 15) -> X < 13
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return ReplaceInstUsesWith(I, LHS);
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case ICmpInst::ICMP_ULT: // (X s< 13 & X u< 15) -> no change
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break;
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}
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break;
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case ICmpInst::ICMP_UGT:
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switch (RHSCC) {
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default: assert(0 && "Unknown integer condition code!");
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case ICmpInst::ICMP_EQ: // (X u> 13 & X == 15) -> X == 15
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case ICmpInst::ICMP_UGT: // (X u> 13 & X u> 15) -> X u> 15
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return ReplaceInstUsesWith(I, RHS);
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case ICmpInst::ICMP_SGT: // (X u> 13 & X s> 15) -> no change
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break;
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case ICmpInst::ICMP_NE:
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if (RHSCst == AddOne(LHSCst)) // (X u> 13 & X != 14) -> X u> 14
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return new ICmpInst(LHSCC, Val, RHSCst);
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break; // (X u> 13 & X != 15) -> no change
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case ICmpInst::ICMP_ULT: // (X u> 13 & X u< 15) ->(X-14) <u 1
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return InsertRangeTest(Val, AddOne(LHSCst), RHSCst, false, true, I);
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case ICmpInst::ICMP_SLT: // (X u> 13 & X s< 15) -> no change
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break;
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}
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break;
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case ICmpInst::ICMP_SGT:
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switch (RHSCC) {
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default: assert(0 && "Unknown integer condition code!");
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case ICmpInst::ICMP_EQ: // (X s> 13 & X == 15) -> X == 15
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case ICmpInst::ICMP_SGT: // (X s> 13 & X s> 15) -> X s> 15
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return ReplaceInstUsesWith(I, RHS);
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case ICmpInst::ICMP_UGT: // (X s> 13 & X u> 15) -> no change
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break;
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case ICmpInst::ICMP_NE:
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if (RHSCst == AddOne(LHSCst)) // (X s> 13 & X != 14) -> X s> 14
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return new ICmpInst(LHSCC, Val, RHSCst);
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break; // (X s> 13 & X != 15) -> no change
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case ICmpInst::ICMP_SLT: // (X s> 13 & X s< 15) ->(X-14) s< 1
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return InsertRangeTest(Val, AddOne(LHSCst), RHSCst, true, true, I);
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case ICmpInst::ICMP_ULT: // (X s> 13 & X u< 15) -> no change
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break;
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}
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break;
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}
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}
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if (ICmpInst *LHS = dyn_cast<ICmpInst>(Op0))
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if (Instruction *Res = FoldAndOfICmps(I, LHS, RHS))
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return Res;
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}
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// fold (and (cast A), (cast B)) -> (cast (and A, B))
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