#define LLVM_OPERATOR_H
#include "llvm/Constants.h"
+#include "llvm/DataLayout.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Instruction.h"
#include "llvm/Type.h"
+#include "llvm/Support/GetElementPtrTypeIterator.h"
namespace llvm {
};
/// Convenience struct for specifying and reasoning about fast-math flags.
-struct FastMathFlags {
- bool UnsafeAlgebra : 1;
- bool NoNaNs : 1;
- bool NoInfs : 1;
- bool NoSignedZeros : 1;
- bool AllowReciprocal : 1;
-
- FastMathFlags() : UnsafeAlgebra(false), NoNaNs(false), NoInfs(false),
- NoSignedZeros(false), AllowReciprocal(false)
- { }
-
- bool any() {
- return UnsafeAlgebra || NoNaNs || NoInfs || NoSignedZeros ||
- AllowReciprocal;
- }
-};
-
+class FastMathFlags {
+private:
+ friend class FPMathOperator;
+ unsigned Flags;
+ FastMathFlags(unsigned F) : Flags(F) { }
-/// FPMathOperator - Utility class for floating point operations which can have
-/// information about relaxed accuracy requirements attached to them.
-class FPMathOperator : public Operator {
public:
enum {
UnsafeAlgebra = (1 << 0),
AllowReciprocal = (1 << 4)
};
+ FastMathFlags() : Flags(0)
+ { }
+
+ /// Whether any flag is set
+ bool any() { return Flags != 0; }
+
+ /// Set all the flags to false
+ void clear() { Flags = 0; }
+
+ /// Flag queries
+ bool noNaNs() { return 0 != (Flags & NoNaNs); }
+ bool noInfs() { return 0 != (Flags & NoInfs); }
+ bool noSignedZeros() { return 0 != (Flags & NoSignedZeros); }
+ bool allowReciprocal() { return 0 != (Flags & AllowReciprocal); }
+ bool unsafeAlgebra() { return 0 != (Flags & UnsafeAlgebra); }
+
+ /// Flag setters
+ void setNoNaNs() { Flags |= NoNaNs; }
+ void setNoInfs() { Flags |= NoInfs; }
+ void setNoSignedZeros() { Flags |= NoSignedZeros; }
+ void setAllowReciprocal() { Flags |= AllowReciprocal; }
+ void setUnsafeAlgebra() {
+ Flags |= UnsafeAlgebra;
+ setNoNaNs();
+ setNoInfs();
+ setNoSignedZeros();
+ setAllowReciprocal();
+ }
+};
+
+
+/// FPMathOperator - Utility class for floating point operations which can have
+/// information about relaxed accuracy requirements attached to them.
+class FPMathOperator : public Operator {
private:
friend class Instruction;
void setHasUnsafeAlgebra(bool B) {
SubclassOptionalData =
- (SubclassOptionalData & ~UnsafeAlgebra) | (B * UnsafeAlgebra);
+ (SubclassOptionalData & ~FastMathFlags::UnsafeAlgebra) |
+ (B * FastMathFlags::UnsafeAlgebra);
// Unsafe algebra implies all the others
if (B) {
}
void setHasNoNaNs(bool B) {
SubclassOptionalData =
- (SubclassOptionalData & ~NoNaNs) | (B * NoNaNs);
+ (SubclassOptionalData & ~FastMathFlags::NoNaNs) |
+ (B * FastMathFlags::NoNaNs);
}
void setHasNoInfs(bool B) {
SubclassOptionalData =
- (SubclassOptionalData & ~NoInfs) | (B * NoInfs);
+ (SubclassOptionalData & ~FastMathFlags::NoInfs) |
+ (B * FastMathFlags::NoInfs);
}
void setHasNoSignedZeros(bool B) {
SubclassOptionalData =
- (SubclassOptionalData & ~NoSignedZeros) | (B * NoSignedZeros);
+ (SubclassOptionalData & ~FastMathFlags::NoSignedZeros) |
+ (B * FastMathFlags::NoSignedZeros);
}
void setHasAllowReciprocal(bool B) {
SubclassOptionalData =
- (SubclassOptionalData & ~AllowReciprocal) | (B * AllowReciprocal);
+ (SubclassOptionalData & ~FastMathFlags::AllowReciprocal) |
+ (B * FastMathFlags::AllowReciprocal);
}
/// Convenience function for setting all the fast-math flags
void setFastMathFlags(FastMathFlags FMF) {
- if (FMF.UnsafeAlgebra) {
- // Set all the bits to true
- setHasUnsafeAlgebra(true);
- return;
- }
-
- setHasUnsafeAlgebra(FMF.UnsafeAlgebra);
- setHasNoNaNs(FMF.NoNaNs);
- setHasNoInfs(FMF.NoInfs);
- setHasNoSignedZeros(FMF.NoSignedZeros);
- setHasAllowReciprocal(FMF.AllowReciprocal);
+ SubclassOptionalData |= FMF.Flags;
}
public:
/// Test whether this operation is permitted to be
/// algebraically transformed, aka the 'A' fast-math property.
bool hasUnsafeAlgebra() const {
- return (SubclassOptionalData & UnsafeAlgebra) != 0;
+ return (SubclassOptionalData & FastMathFlags::UnsafeAlgebra) != 0;
}
/// Test whether this operation's arguments and results are to be
/// treated as non-NaN, aka the 'N' fast-math property.
bool hasNoNaNs() const {
- return (SubclassOptionalData & NoNaNs) != 0;
+ return (SubclassOptionalData & FastMathFlags::NoNaNs) != 0;
}
/// Test whether this operation's arguments and results are to be
/// treated as NoN-Inf, aka the 'I' fast-math property.
bool hasNoInfs() const {
- return (SubclassOptionalData & NoInfs) != 0;
+ return (SubclassOptionalData & FastMathFlags::NoInfs) != 0;
}
/// Test whether this operation can treat the sign of zero
/// as insignificant, aka the 'S' fast-math property.
bool hasNoSignedZeros() const {
- return (SubclassOptionalData & NoSignedZeros) != 0;
+ return (SubclassOptionalData & FastMathFlags::NoSignedZeros) != 0;
}
/// Test whether this operation is permitted to use
/// reciprocal instead of division, aka the 'R' fast-math property.
bool hasAllowReciprocal() const {
- return (SubclassOptionalData & AllowReciprocal) != 0;
+ return (SubclassOptionalData & FastMathFlags::AllowReciprocal) != 0;
}
/// Convenience function for getting all the fast-math flags
FastMathFlags getFastMathFlags() const {
- FastMathFlags FMF;
- FMF.UnsafeAlgebra = hasUnsafeAlgebra();
- FMF.NoNaNs = hasNoNaNs();
- FMF.NoInfs = hasNoInfs();
- FMF.NoSignedZeros = hasNoSignedZeros();
- FMF.AllowReciprocal = hasAllowReciprocal();
- return FMF;
+ return FastMathFlags(SubclassOptionalData);
}
-
/// \brief Get the maximum error permitted by this operation in ULPs. An
/// accuracy of 0.0 means that the operation should be performed with the
/// default precision.
}
return true;
}
+
+ /// \brief Accumulate the constant address offset of this GEP if possible.
+ ///
+ /// This routine accepts an APInt into which it will accumulate the constant
+ /// offset of this GEP if the GEP is in fact constant. If the GEP is not
+ /// all-constant, it returns false and the value of the offset APInt is
+ /// undefined (it is *not* preserved!). The APInt passed into this routine
+ /// must be at least as wide as the IntPtr type for the address space of
+ /// the base GEP pointer.
+ bool accumulateConstantOffset(const DataLayout &DL, APInt &Offset) const {
+ assert(Offset.getBitWidth() ==
+ DL.getPointerSizeInBits(getPointerAddressSpace()) &&
+ "The offset must have exactly as many bits as our pointer.");
+
+ for (gep_type_iterator GTI = gep_type_begin(this), GTE = gep_type_end(this);
+ GTI != GTE; ++GTI) {
+ ConstantInt *OpC = dyn_cast<ConstantInt>(GTI.getOperand());
+ if (!OpC)
+ return false;
+ if (OpC->isZero())
+ continue;
+
+ // Handle a struct index, which adds its field offset to the pointer.
+ if (StructType *STy = dyn_cast<StructType>(*GTI)) {
+ unsigned ElementIdx = OpC->getZExtValue();
+ const StructLayout *SL = DL.getStructLayout(STy);
+ Offset += APInt(Offset.getBitWidth(),
+ SL->getElementOffset(ElementIdx));
+ continue;
+ }
+
+ // For array or vector indices, scale the index by the size of the type.
+ APInt Index = OpC->getValue().sextOrTrunc(Offset.getBitWidth());
+ Offset += Index * APInt(Offset.getBitWidth(),
+ DL.getTypeAllocSize(GTI.getIndexedType()));
+ }
+ return true;
+ }
+
};
} // End llvm namespace
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