[llvm-stress] Add getRandom() helper that was going to be part of D34157. NFCI.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@306294 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 32 insertions, 27 deletions

diff --git a/tools/llvm-stress/llvm-stress.cpp b/tools/llvm-stress/llvm-stress.cpp
index 46c5bc4deec..3cf8b37bc2e 100644
--- a/tools/llvm-stress/llvm-stress.cpp
+++ b/tools/llvm-stress/llvm-stress.cpp
@@ -168,19 +168,24 @@ public:
   }
 
 protected:
+  /// Return a random integer.
+  uint32_t getRandom() {
+    return Ran->Rand();
+  }
+
   /// Return a random value from the list of known values.
   Value *getRandomVal() {
     assert(PT->size());
-    return PT->at(Ran->Rand() % PT->size());
+    return PT->at(getRandom() % PT->size());
   }
 
   Constant *getRandomConstant(Type *Tp) {
     if (Tp->isIntegerTy()) {
-      if (Ran->Rand() & 1)
+      if (getRandom() & 1)
         return ConstantInt::getAllOnesValue(Tp);
       return ConstantInt::getNullValue(Tp);
     } else if (Tp->isFloatingPointTy()) {
-      if (Ran->Rand() & 1)
+      if (getRandom() & 1)
         return ConstantFP::getAllOnesValue(Tp);
       return ConstantFP::getNullValue(Tp);
     }
@@ -189,7 +194,7 @@ protected:
 
   /// Return a random value with a known type.
   Value *getRandomValue(Type *Tp) {
-    unsigned index = Ran->Rand();
+    unsigned index = getRandom();
     for (unsigned i=0; i<PT->size(); ++i) {
       Value *V = PT->at((index + i) % PT->size());
       if (V->getType() == Tp)
@@ -198,11 +203,11 @@ protected:
 
     // If the requested type was not found, generate a constant value.
     if (Tp->isIntegerTy()) {
-      if (Ran->Rand() & 1)
+      if (getRandom() & 1)
         return ConstantInt::getAllOnesValue(Tp);
       return ConstantInt::getNullValue(Tp);
     } else if (Tp->isFloatingPointTy()) {
-      if (Ran->Rand() & 1)
+      if (getRandom() & 1)
         return ConstantFP::getAllOnesValue(Tp);
       return ConstantFP::getNullValue(Tp);
     } else if (Tp->isVectorTy()) {
@@ -222,7 +227,7 @@ protected:
 
   /// Return a random value of any pointer type.
   Value *getRandomPointerValue() {
-    unsigned index = Ran->Rand();
+    unsigned index = getRandom();
     for (unsigned i=0; i<PT->size(); ++i) {
       Value *V = PT->at((index + i) % PT->size());
       if (V->getType()->isPointerTy())
@@ -233,7 +238,7 @@ protected:
 
   /// Return a random value of any vector type.
   Value *getRandomVectorValue() {
-    unsigned index = Ran->Rand();
+    unsigned index = getRandom();
     for (unsigned i=0; i<PT->size(); ++i) {
       Value *V = PT->at((index + i) % PT->size());
       if (V->getType()->isVectorTy())
@@ -244,7 +249,7 @@ protected:
 
   /// Pick a random type.
   Type *pickType() {
-    return (Ran->Rand() & 1 ? pickVectorType() : pickScalarType());
+    return (getRandom() & 1 ? pickVectorType() : pickScalarType());
   }
 
   /// Pick a random pointer type.
@@ -258,7 +263,7 @@ protected:
     // Pick a random vector width in the range 2**0 to 2**4.
     // by adding two randoms we are generating a normal-like distribution
     // around 2**3.
-    unsigned width = 1<<((Ran->Rand() % 3) + (Ran->Rand() % 3));
+    unsigned width = 1<<((getRandom() % 3) + (getRandom() % 3));
     Type *Ty;
 
     // Vectors of x86mmx are illegal; keep trying till we get something else.
@@ -288,7 +293,7 @@ protected:
         AdditionalScalarTypes.begin(), AdditionalScalarTypes.end());
     }
 
-    return ScalarTypes[Ran->Rand() % ScalarTypes.size()];
+    return ScalarTypes[getRandom() % ScalarTypes.size()];
   }
 
   /// Basic block to populate
@@ -348,7 +353,7 @@ struct BinModifier: public Modifier {
 
     bool isFloat = Val0->getType()->getScalarType()->isFloatingPointTy();
     Instruction* Term = BB->getTerminator();
-    unsigned R = Ran->Rand() % (isFloat ? 7 : 13);
+    unsigned R = getRandom() % (isFloat ? 7 : 13);
     Instruction::BinaryOps Op;
 
     switch (R) {
@@ -379,7 +384,7 @@ struct ConstModifier: public Modifier {
     Type *Ty = pickType();
 
     if (Ty->isVectorTy()) {
-      switch (Ran->Rand() % 2) {
+      switch (getRandom() % 2) {
       case 0: if (Ty->getScalarType()->isIntegerTy())
                 return PT->push_back(ConstantVector::getAllOnesValue(Ty));
               break;
@@ -398,13 +403,13 @@ struct ConstModifier: public Modifier {
       APInt RandomInt(Ty->getPrimitiveSizeInBits(), makeArrayRef(RandomBits));
       APFloat RandomFloat(Ty->getFltSemantics(), RandomInt);
 
-      if (Ran->Rand() & 1)
+      if (getRandom() & 1)
         return PT->push_back(ConstantFP::getNullValue(Ty));
       return PT->push_back(ConstantFP::get(Ty->getContext(), RandomFloat));
     }
 
     if (Ty->isIntegerTy()) {
-      switch (Ran->Rand() % 7) {
+      switch (getRandom() % 7) {
       case 0:
         return PT->push_back(ConstantInt::get(
             Ty, APInt::getAllOnesValue(Ty->getPrimitiveSizeInBits())));
@@ -416,7 +421,7 @@ struct ConstModifier: public Modifier {
       case 4:
       case 5:
       case 6:
-        PT->push_back(ConstantInt::get(Ty, Ran->Rand()));
+        PT->push_back(ConstantInt::get(Ty, getRandom()));
       }
     }
   }
@@ -441,7 +446,7 @@ struct ExtractElementModifier: public Modifier {
     Value *Val0 = getRandomVectorValue();
     Value *V = ExtractElementInst::Create(Val0,
              ConstantInt::get(Type::getInt32Ty(BB->getContext()),
-             Ran->Rand() % cast<VectorType>(Val0->getType())->getNumElements()),
+             getRandom() % cast<VectorType>(Val0->getType())->getNumElements()),
              "E", BB->getTerminator());
     return PT->push_back(V);
   }
@@ -459,9 +464,9 @@ struct ShuffModifier: public Modifier {
 
     Type *I32 = Type::getInt32Ty(BB->getContext());
     for (unsigned i=0; i<Width; ++i) {
-      Constant *CI = ConstantInt::get(I32, Ran->Rand() % (Width*2));
+      Constant *CI = ConstantInt::get(I32, getRandom() % (Width*2));
       // Pick some undef values.
-      if (!(Ran->Rand() % 5))
+      if (!(getRandom() % 5))
         CI = UndefValue::get(I32);
       Idxs.push_back(CI);
     }
@@ -484,7 +489,7 @@ struct InsertElementModifier: public Modifier {
 
     Value *V = InsertElementInst::Create(Val0, Val1,
               ConstantInt::get(Type::getInt32Ty(BB->getContext()),
-              Ran->Rand() % cast<VectorType>(Val0->getType())->getNumElements()),
+              getRandom() % cast<VectorType>(Val0->getType())->getNumElements()),
               "I",  BB->getTerminator());
     return PT->push_back(V);
   }
@@ -520,7 +525,7 @@ struct CastModifier: public Modifier {
     unsigned DestSize = DestTy->getScalarType()->getPrimitiveSizeInBits();
 
     // Generate lots of bitcasts.
-    if ((Ran->Rand() & 1) && VSize == DestSize) {
+    if ((getRandom() & 1) && VSize == DestSize) {
       return PT->push_back(
         new BitCastInst(V, DestTy, "BC", BB->getTerminator()));
     }
@@ -533,7 +538,7 @@ struct CastModifier: public Modifier {
           new TruncInst(V, DestTy, "Tr", BB->getTerminator()));
       } else {
         assert(VSize < DestSize && "Different int types with the same size?");
-        if (Ran->Rand() & 1)
+        if (getRandom() & 1)
           return PT->push_back(
             new ZExtInst(V, DestTy, "ZE", BB->getTerminator()));
         return PT->push_back(new SExtInst(V, DestTy, "Se", BB->getTerminator()));
@@ -543,7 +548,7 @@ struct CastModifier: public Modifier {
     // Fp to int.
     if (VTy->getScalarType()->isFloatingPointTy() &&
         DestTy->getScalarType()->isIntegerTy()) {
-      if (Ran->Rand() & 1)
+      if (getRandom() & 1)
         return PT->push_back(
           new FPToSIInst(V, DestTy, "FC", BB->getTerminator()));
       return PT->push_back(new FPToUIInst(V, DestTy, "FC", BB->getTerminator()));
@@ -552,7 +557,7 @@ struct CastModifier: public Modifier {
     // Int to fp.
     if (VTy->getScalarType()->isIntegerTy() &&
         DestTy->getScalarType()->isFloatingPointTy()) {
-      if (Ran->Rand() & 1)
+      if (getRandom() & 1)
         return PT->push_back(
           new SIToFPInst(V, DestTy, "FC", BB->getTerminator()));
       return PT->push_back(new UIToFPInst(V, DestTy, "FC", BB->getTerminator()));
@@ -589,7 +594,7 @@ struct SelectModifier: public Modifier {
 
       // If the value type is a vector, and we allow vector select, then in 50%
       // of the cases generate a vector select.
-      if (Val0->getType()->isVectorTy() && (Ran->Rand() % 1)) {
+      if (Val0->getType()->isVectorTy() && (getRandom() % 1)) {
         unsigned NumElem = cast<VectorType>(Val0->getType())->getNumElements();
         CondTy = VectorType::get(CondTy, NumElem);
       }
@@ -613,11 +618,11 @@ struct CmpModifier: public Modifier {
 
     int op;
     if (fp) {
-      op = Ran->Rand() %
+      op = getRandom() %
       (CmpInst::LAST_FCMP_PREDICATE - CmpInst::FIRST_FCMP_PREDICATE) +
        CmpInst::FIRST_FCMP_PREDICATE;
     } else {
-      op = Ran->Rand() %
+      op = getRandom() %
       (CmpInst::LAST_ICMP_PREDICATE - CmpInst::FIRST_ICMP_PREDICATE) +
        CmpInst::FIRST_ICMP_PREDICATE;
     }