Squelch some GCC warnings

Mostly signed/unsigned comparison mismatches.

Author: jrprice

src/core/WorkItem.cpp

@@ -1439,8 +1439,8 @@ INSTRUCTION(shuffle)
   const llvm::Value* v1 = shuffle->getOperand(0);
   const llvm::Value* v2 = shuffle->getOperand(1);
 
-  unsigned num =
-    llvm::cast<llvm::FixedVectorType>(v1->getType())->getNumElements();
+  int num = static_cast<int>(
+    llvm::cast<llvm::FixedVectorType>(v1->getType())->getNumElements());
   for (unsigned i = 0; i < result.num; i++)
   {
     const llvm::Value* src = v1;

src/core/common.cpp

@@ -877,7 +877,7 @@ size_t resolveGEP(size_t base, const llvm::Type* sourceElementType,
   address += offsets[0] * getTypeSize(sourceElementType);
 
   // Iterate over indices
-  for (int i = 1; i < offsets.size(); i++)
+  for (size_t i = 1; i < offsets.size(); i++)
   {
     int64_t offset = offsets[i];
 

src/kernel/Simulation.cpp

@@ -256,7 +256,7 @@ bool Simulation::load(const char* filename)
 void Simulation::parseArgument(size_t index)
 {
   // Argument parsing parameters
-  size_t size = -1;
+  size_t size = SIZE_MAX;
   cl_mem_flags flags = 0;
   ArgDataType type = TYPE_NONE;
   size_t typeSize = 0;
@@ -437,13 +437,13 @@ void Simulation::parseArgument(size_t index)
   // Ensure size given
   if (null)
   {
-    if (size != -1 || !fill.empty() || !range.empty() || noinit || dump)
+    if (size != SIZE_MAX || !fill.empty() || !range.empty() || noinit || dump)
     {
       throw "'null' not valid with other argument descriptors";
     }
     size = 0;
   }
-  else if (size == -1)
+  else if (size == SIZE_MAX)
   {
     throw "size required";
   }
@@ -643,7 +643,7 @@ template <typename T>
 void Simulation::parseArgumentData(unsigned char* result, size_t size)
 {
   vector<T> data;
-  for (int i = 0; i < size / sizeof(T); i++)
+  for (size_t i = 0; i < size / sizeof(T); i++)
   {
     T value;
     if (sizeof(T) == 1)
@@ -666,7 +666,7 @@ void Simulation::parseFill(unsigned char* result, size_t size,
                            istringstream& fill)
 {
   T value = readValue<T>(fill);
-  for (int i = 0; i < size / sizeof(T); i++)
+  for (size_t i = 0; i < size / sizeof(T); i++)
   {
     ((T*)result)[i] = value;
   }

src/plugins/Uninitialized.cpp

@@ -1644,8 +1644,8 @@ void Uninitialized::instructionExecuted(const WorkItem* workItem,
     TypedValue newShadow = ShadowContext::getCleanValue(result);
     TypedValue pv = ShadowContext::getPoisonedValue(newShadow.size);
 
-    unsigned num =
-      llvm::cast<llvm::FixedVectorType>(v1->getType())->getNumElements();
+    int num = static_cast<int>(
+      llvm::cast<llvm::FixedVectorType>(v1->getType())->getNumElements());
     for (unsigned i = 0; i < newShadow.num; i++)
     {
       int index = shuffleInst->getMaskValue(i);

src/plugins/Uninitialized.h

@@ -14,7 +14,7 @@
 // #define PARANOID_CHECK(W, I) assert(checkAllOperandsDefined(W, I) && "Not all
 //  operands defined") #define PARANOID_CHECK(W, I) checkAllOperandsDefined(W,
 //  I)
-#define PARANOID_CHECK(W, I) (void*)0
+#define PARANOID_CHECK(W, I) static_assert(true)
 
 namespace oclgrind
 {