X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Fllvm%2FOperator.h;h=289df4e8480a2f030f4f50ad3bd5176cf3f97344;hb=0d38424bbebf2b52cb4ed93eff08e1085c859e91;hp=41e6db0b961f760f517fad923c7d4ecd5279c822;hpb=30f57da439dc6313e8704dec09da0a3789060608;p=oota-llvm.git

diff --git a/include/llvm/Operator.h b/include/llvm/Operator.h
index 41e6db0b961..289df4e8480 100644
--- a/include/llvm/Operator.h
+++ b/include/llvm/Operator.h
@@ -37,6 +37,7 @@ private:
   void *operator new(size_t s) LLVM_DELETED_FUNCTION;
   Operator() LLVM_DELETED_FUNCTION;
 
+protected:
   // NOTE: Cannot use LLVM_DELETED_FUNCTION because it's not legal to delete
   // an overridden method that's not deleted in the base class. Cannot leave
   // this unimplemented because that leads to an ODR-violation.
@@ -130,21 +131,21 @@ public:
   enum {
     IsExact = (1 << 0)
   };
-  
+
 private:
   friend class BinaryOperator;
   friend class ConstantExpr;
   void setIsExact(bool B) {
     SubclassOptionalData = (SubclassOptionalData & ~IsExact) | (B * IsExact);
   }
-  
+
 public:
   /// isExact - Test whether this division is known to be exact, with
   /// zero remainder.
   bool isExact() const {
     return SubclassOptionalData & IsExact;
   }
-  
+
   static bool isPossiblyExactOpcode(unsigned OpC) {
     return OpC == Instruction::SDiv ||
            OpC == Instruction::UDiv ||
@@ -163,10 +164,132 @@ public:
   }
 };
 
+/// 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)
+  { }
+
+  /// Whether any flag is set
+  bool any() {
+    return UnsafeAlgebra || NoNaNs || NoInfs || NoSignedZeros ||
+      AllowReciprocal;
+  }
+
+  /// Set all the flags to false
+  void clear() {
+    UnsafeAlgebra = NoNaNs = NoInfs = NoSignedZeros = AllowReciprocal = false;
+  }
+};
+
+
 /// 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),
+    NoNaNs          = (1 << 1),
+    NoInfs          = (1 << 2),
+    NoSignedZeros   = (1 << 3),
+    AllowReciprocal = (1 << 4)
+  };
+
+private:
+  friend class Instruction;
+
+  void setHasUnsafeAlgebra(bool B) {
+    SubclassOptionalData =
+      (SubclassOptionalData & ~UnsafeAlgebra) | (B * UnsafeAlgebra);
+
+    // Unsafe algebra implies all the others
+    if (B) {
+      setHasNoNaNs(true);
+      setHasNoInfs(true);
+      setHasNoSignedZeros(true);
+      setHasAllowReciprocal(true);
+    }
+  }
+  void setHasNoNaNs(bool B) {
+    SubclassOptionalData =
+      (SubclassOptionalData & ~NoNaNs) | (B * NoNaNs);
+  }
+  void setHasNoInfs(bool B) {
+    SubclassOptionalData =
+      (SubclassOptionalData & ~NoInfs) | (B * NoInfs);
+  }
+  void setHasNoSignedZeros(bool B) {
+    SubclassOptionalData =
+      (SubclassOptionalData & ~NoSignedZeros) | (B * NoSignedZeros);
+  }
+  void setHasAllowReciprocal(bool B) {
+    SubclassOptionalData =
+      (SubclassOptionalData & ~AllowReciprocal) | (B * 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);
+  }
+
+public:
+  /// Test whether this operation is permitted to be
+  /// algebraically transformed, aka the 'A' fast-math property.
+  bool hasUnsafeAlgebra() const {
+    return (SubclassOptionalData & 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;
+  }
+
+  /// 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;
+  }
+
+  /// 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;
+  }
+
+  /// 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;
+  }
+
+  /// 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;
+  }
+
 
   /// \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
@@ -181,7 +304,7 @@ public:
   }
 };
 
-  
+
 /// ConcreteOperator - A helper template for defining operators for individual
 /// opcodes.
 template<typename SuperClass, unsigned Opc>