Change name of copyFlags() to copyIRFlags(). Add convenience method for logical 'and' of all flags. NFC.

Adding 'IR' to the names in an attempt to be less ambiguous about the flags we're dealing with here.

The 'and' method is needed by the SLPVectorizer (PR20802) and possibly other passes.

llvm-svn: 217004

include/llvm/IR/InstrTypes.h

@@ -360,7 +360,11 @@ public:
 
   /// Convenience method to copy supported wrapping, exact, and fast-math flags
   /// from V to this instruction.
-  void copyFlags(const Value *V);
+  void copyIRFlags(const Value *V);
+  
+  /// Logical 'and' of any supported wrapping, exact, and fast-math flags of
+  /// V and this instruction.
+  void andIRFlags(const Value *V);
 
   // Methods for support type inquiry through isa, cast, and dyn_cast:
   static inline bool classof(const Instruction *I) {

lib/IR/Instructions.cpp

@@ -2030,7 +2030,7 @@ bool BinaryOperator::isExact() const {
   return cast<PossiblyExactOperator>(this)->isExact();
 }
 
-void BinaryOperator::copyFlags(const Value *V) {
+void BinaryOperator::copyIRFlags(const Value *V) {
   // Copy the wrapping flags.
   if (auto *OB = dyn_cast<OverflowingBinaryOperator>(V)) {
     setHasNoSignedWrap(OB->hasNoSignedWrap());
@@ -2046,6 +2046,23 @@ void BinaryOperator::copyFlags(const Value *V) {
     copyFastMathFlags(FP->getFastMathFlags());
 }
 
+void BinaryOperator::andIRFlags(const Value *V) {
+  if (auto *OB = dyn_cast<OverflowingBinaryOperator>(V)) {
+    setHasNoSignedWrap(hasNoSignedWrap() & OB->hasNoSignedWrap());
+    setHasNoUnsignedWrap(hasNoUnsignedWrap() & OB->hasNoUnsignedWrap());
+  }
+  
+  if (auto *PE = dyn_cast<PossiblyExactOperator>(V))
+    setIsExact(isExact() & PE->isExact());
+  
+  if (auto *FP = dyn_cast<FPMathOperator>(V)) {
+    FastMathFlags FM = getFastMathFlags();
+    FM &= FP->getFastMathFlags();
+    copyFastMathFlags(FM);
+  }
+}
+
+
 //===----------------------------------------------------------------------===//
 //                             FPMathOperator Class
 //===----------------------------------------------------------------------===//

lib/Transforms/Vectorize/LoopVectorize.cpp

@@ -3249,7 +3249,7 @@ void InnerLoopVectorizer::vectorizeBlockInLoop(BasicBlock *BB, PhiVector *PV) {
         Value *V = Builder.CreateBinOp(BinOp->getOpcode(), A[Part], B[Part]);
 
         if (BinaryOperator *VecOp = dyn_cast<BinaryOperator>(V))
-          VecOp->copyFlags(BinOp);
+          VecOp->copyIRFlags(BinOp);
         
         Entry[Part] = V;
       }