class Value;
class TargetData;
- /// SimplifyCompare - Given operands for a CmpInst, see if we can
+ /// SimplifyICmpInst - Given operands for an ICmpInst, see if we can
/// fold the result. If not, this returns null.
- Value *SimplifyCompare(unsigned Predicate, Value *LHS, Value *RHS,
+ Value *SimplifyICmpInst(unsigned Predicate, Value *LHS, Value *RHS,
const TargetData *TD = 0);
+ /// SimplifyFCmpInst - Given operands for an FCmpInst, see if we can
+ /// fold the result. If not, this returns null.
+ Value *SimplifyFCmpInst(unsigned Predicate, Value *LHS, Value *RHS,
+ const TargetData *TD = 0);
+
+
+ //=== Helper functions for higher up the class hierarchy.
+
+
+ /// SimplifyCmpInst - Given operands for a CmpInst, see if we can
+ /// fold the result. If not, this returns null.
+ Value *SimplifyCmpInst(unsigned Predicate, Value *LHS, Value *RHS,
+ const TargetData *TD = 0);
/// SimplifyBinOp - Given operands for a BinaryOperator, see if we can
/// fold the result. If not, this returns null.
/// @brief Create a CmpInst
static CmpInst *Create(OtherOps Op, unsigned short predicate, Value *S1,
Value *S2, const Twine &Name, BasicBlock *InsertAtEnd);
-
+
/// @brief Get the opcode casted to the right type
OtherOps getOpcode() const {
return static_cast<OtherOps>(Instruction::getOpcode());
/// @brief Set the predicate for this instruction to the specified value.
void setPredicate(Predicate P) { SubclassData = P; }
+ static bool isFPPredicate(Predicate P) {
+ return P >= FIRST_FCMP_PREDICATE && P <= LAST_FCMP_PREDICATE;
+ }
+
+ static bool isIntPredicate(Predicate P) {
+ return P >= FIRST_ICMP_PREDICATE && P <= LAST_ICMP_PREDICATE;
+ }
+
+ bool isFPPredicate() const { return isFPPredicate(getPredicate()); }
+ bool isIntPredicate() const { return isIntPredicate(getPredicate()); }
+
+
/// For example, EQ -> NE, UGT -> ULE, SLT -> SGE,
/// OEQ -> UNE, UGT -> OLE, OLT -> UGE, etc.
/// @returns the inverse predicate for the instruction's current predicate.
}
-/// SimplifyCompare - Given operands for a CmpInst, see if we can
-/// fold the result.
-Value *llvm::SimplifyCompare(unsigned Predicate, Value *LHS, Value *RHS,
- const TargetData *TD) {
+/// SimplifyICmpInst - Given operands for an ICmpInst, see if we can
+/// fold the result. If not, this returns null.
+Value *llvm::SimplifyICmpInst(unsigned Predicate, Value *LHS, Value *RHS,
+ const TargetData *TD) {
CmpInst::Predicate Pred = (CmpInst::Predicate)Predicate;
+ assert(CmpInst::isIntPredicate(Pred) && "Not an integer compare!");
if (Constant *CLHS = dyn_cast<Constant>(LHS))
if (Constant *CRHS = dyn_cast<Constant>(RHS))
// If this is an integer compare and the LHS and RHS are the same, fold it.
if (LHS == RHS)
- if (isa<IntegerType>(LHS->getType()) || isa<PointerType>(LHS->getType())) {
- if (ICmpInst::isTrueWhenEqual(Pred))
- return ConstantInt::getTrue(LHS->getContext());
- else
- return ConstantInt::getFalse(LHS->getContext());
- }
+ if (ICmpInst::isTrueWhenEqual(Pred))
+ return ConstantInt::getTrue(LHS->getContext());
+ else
+ return ConstantInt::getFalse(LHS->getContext());
+
+ return 0;
+}
+
+/// SimplifyFCmpInst - Given operands for an FCmpInst, see if we can
+/// fold the result. If not, this returns null.
+Value *llvm::SimplifyFCmpInst(unsigned Predicate, Value *LHS, Value *RHS,
+ const TargetData *TD) {
+ CmpInst::Predicate Pred = (CmpInst::Predicate)Predicate;
+ assert(CmpInst::isFPPredicate(Pred) && "Not an FP compare!");
+
+ if (Constant *CLHS = dyn_cast<Constant>(LHS))
+ if (Constant *CRHS = dyn_cast<Constant>(RHS))
+ return ConstantFoldCompareInstOperands(Pred, CLHS, CRHS, TD);
+
return 0;
}
+
+
+/// SimplifyCmpInst - Given operands for a CmpInst, see if we can
+/// fold the result.
+Value *llvm::SimplifyCmpInst(unsigned Predicate, Value *LHS, Value *RHS,
+ const TargetData *TD) {
+ if (CmpInst::isIntPredicate((CmpInst::Predicate)Predicate))
+ return SimplifyICmpInst(Predicate, LHS, RHS, TD);
+ return SimplifyFCmpInst(Predicate, LHS, RHS, TD);
+}
+
#include "llvm/GlobalVariable.h"
#include "llvm/Operator.h"
#include "llvm/Analysis/ConstantFolding.h"
+#include "llvm/Analysis/InstructionSimplify.h"
#include "llvm/Analysis/MemoryBuiltins.h"
#include "llvm/Analysis/ValueTracking.h"
#include "llvm/Target/TargetData.h"
Value *LHS = PN->getIncomingValue(i);
Value *RHS = Cmp->getOperand(1)->DoPHITranslation(BB, PredBB);
- Value *Res = SimplifyCompare(Cmp->getPredicate(), LHS, RHS);
+ Value *Res = SimplifyCmpInst(Cmp->getPredicate(), LHS, RHS);
if (Res == 0) continue;
if (isa<UndefValue>(Res))