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merge a check into a place where it is simpler. 

llvm-svn: 59400
This commit is contained in:
Chris Lattner 2008-11-16 05:10:52 +00:00
parent 7a82474387
commit feaea9bdf7
1 changed files with 17 additions and 20 deletions
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37
llvm/lib/Transforms/Scalar/InstructionCombining.cpp
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@ -3556,15 +3556,28 @@ Value *InstCombiner::FoldLogicalPlusAnd(Value *LHS, Value *RHS,
/// FoldAndOfICmps - Fold (icmp)&(icmp) if possible.
Instruction *InstCombiner::FoldAndOfICmps(Instruction &I,
ICmpInst *LHS, ICmpInst *RHS) {
Value *Val;
Value *Val, *Val2;
ConstantInt *LHSCst, *RHSCst;
ICmpInst::Predicate LHSCC, RHSCC;
// (icmp1 A, C1) & (icmp2 A, C2) --> something simpler.
// This only handles icmp of constants: (icmp1 A, C1) & (icmp2 B, C2).
if (!match(LHS, m_ICmp(LHSCC, m_Value(Val), m_ConstantInt(LHSCst))) ||
!match(RHS, m_ICmp(RHSCC, m_Specific(Val), m_ConstantInt(RHSCst))))
!match(RHS, m_ICmp(RHSCC, m_Value(Val2), m_ConstantInt(RHSCst))))
return 0;
// (icmp ult A, C) & (icmp ult B, C) --> (icmp ult (A|B), C)
// where C is a power of 2
if (LHSCst == RHSCst && LHSCC == RHSCC && LHSCC == ICmpInst::ICMP_ULT &&
LHSCst->getValue().isPowerOf2()) {
Instruction *NewOr = BinaryOperator::CreateOr(Val, Val2);
InsertNewInstBefore(NewOr, I);
return new ICmpInst(LHSCC, NewOr, LHSCst);
}
// From here on, we only handle:
// (icmp1 A, C1) & (icmp2 A, C2) --> something simpler.
if (Val != Val2) return 0;
// ICMP_[US][GL]E X, CST is folded to ICMP_[US][GL]T elsewhere.
if (LHSCC == ICmpInst::ICMP_UGE || LHSCC == ICmpInst::ICMP_ULE ||
RHSCC == ICmpInst::ICMP_UGE || RHSCC == ICmpInst::ICMP_ULE ||
@ -3931,22 +3944,6 @@ Instruction *InstCombiner::visitAnd(BinaryOperator &I) {
}
}
{ // (icmp ult A, C) & (icmp ult B, C) --> (icmp ult (A|B), C)
// where C is a power of 2
Value *A, *B;
ConstantInt *C1, *C2;
ICmpInst::Predicate LHSCC = ICmpInst::BAD_ICMP_PREDICATE;
ICmpInst::Predicate RHSCC = ICmpInst::BAD_ICMP_PREDICATE;
if (match(&I, m_And(m_ICmp(LHSCC, m_Value(A), m_ConstantInt(C1)),
m_ICmp(RHSCC, m_Value(B), m_ConstantInt(C2)))))
if (C1 == C2 && LHSCC == RHSCC && LHSCC == ICmpInst::ICMP_ULT &&
C1->getValue().isPowerOf2()) {
Instruction *NewOr = BinaryOperator::CreateOr(A, B);
InsertNewInstBefore(NewOr, I);
return new ICmpInst(LHSCC, NewOr, C1);
}
}
if (ICmpInst *RHS = dyn_cast<ICmpInst>(Op1)) {
// (icmp1 A, B) & (icmp2 A, B) --> (icmp3 A, B)
if (Instruction *R = AssociativeOpt(I, FoldICmpLogical(*this, RHS)))