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Use isTrueWhenEqual. Thanks Chris!

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llvm-svn: 41741
This commit is contained in:
Nick Lewycky 2007-09-06 02:40:25 +00:00
parent 2f66503c0a
commit 79e179ff1f
1 changed files with 13 additions and 8 deletions
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21
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -1663,16 +1663,22 @@ Value *InstCombiner::SimplifyDemandedVectorElts(Value *V, uint64_t DemandedElts,
return MadeChange ? I : 0;
}
/// @returns true if the specified compare instruction is
/// @returns true if the specified compare predicate is
/// true when both operands are equal...
/// @brief Determine if the ICmpInst returns true if both operands are equal
static bool isTrueWhenEqual(ICmpInst &ICI) {
ICmpInst::Predicate pred = ICI.getPredicate();
/// @brief Determine if the icmp Predicate is true when both operands are equal
static bool isTrueWhenEqual(ICmpInst::Predicate pred) {
return pred == ICmpInst::ICMP_EQ || pred == ICmpInst::ICMP_UGE ||
pred == ICmpInst::ICMP_SGE || pred == ICmpInst::ICMP_ULE ||
pred == ICmpInst::ICMP_SLE;
}
/// @returns true if the specified compare instruction is
/// true when both operands are equal...
/// @brief Determine if the ICmpInst returns true when both operands are equal
static bool isTrueWhenEqual(ICmpInst &ICI) {
return isTrueWhenEqual(ICI.getPredicate());
}
/// AssociativeOpt - Perform an optimization on an associative operator. This
/// function is designed to check a chain of associative operators for a
/// potential to apply a certain optimization. Since the optimization may be
@ -4562,10 +4568,9 @@ Instruction *InstCombiner::FoldGEPICmp(User *GEPLHS, Value *RHS,
if (NumDifferences == 0) // SAME GEP?
return ReplaceInstUsesWith(I, // No comparison is needed here.
ConstantInt::get(Type::Int1Ty,
Cond == ICmpInst::ICMP_EQ ||
Cond == ICmpInst::ICMP_ULE || Cond == ICmpInst::ICMP_UGE ||
Cond == ICmpInst::ICMP_SLE || Cond == ICmpInst::ICMP_SGE));
ConstantInt::get(Type::Int1Ty,
isTrueWhenEqual(Cond)));
else if (NumDifferences == 1) {
Value *LHSV = GEPLHS->getOperand(DiffOperand);
Value *RHSV = GEPRHS->getOperand(DiffOperand);