nv50/ir: add isUniform query to Values

src/gallium/drivers/nv50/codegen/nv50_ir.cpp

@@ -268,6 +268,16 @@ LValue::clone(ClonePolicy<Function>& pol) const
    return that;
 }
 
+bool
+LValue::isUniform() const
+{
+   if (defs.size() > 1)
+      return false;
+   Instruction *insn = getInsn();
+   // let's not try too hard here for now ...
+   return !insn->srcExists(1) && insn->getSrc(0)->isUniform();
+}
+
 Symbol::Symbol(Program *prog, DataFile f, ubyte fidx)
 {
    baseSym = NULL;
@@ -297,6 +307,15 @@ Symbol::clone(ClonePolicy<Function>& pol) const
    return that;
 }
 
+bool
+Symbol::isUniform() const
+{
+   return
+      reg.file != FILE_SYSTEM_VALUE &&
+      reg.file != FILE_MEMORY_LOCAL &&
+      reg.file != FILE_SHADER_INPUT;
+}
+
 ImmediateValue::ImmediateValue(Program *prog, uint32_t uval)
 {
    memset(&reg, 0, sizeof(reg));

src/gallium/drivers/nv50/codegen/nv50_ir.h

@@ -460,6 +460,7 @@ public:
 
    virtual bool equals(const Value *, bool strict = false) const;
    virtual bool interfers(const Value *) const;
+   virtual bool isUniform() const { return true; }
 
    inline Value *rep() const { return join; }
 
@@ -500,6 +501,8 @@ public:
    LValue(Function *, LValue *);
    ~LValue() { }
 
+   virtual bool isUniform() const;
+
    virtual LValue *clone(ClonePolicy<Function>&) const;
 
    virtual int print(char *, size_t, DataType ty = TYPE_NONE) const;
@@ -522,6 +525,8 @@ public:
 
    virtual bool equals(const Value *that, bool strict) const;
 
+   virtual bool isUniform() const;
+
    virtual int print(char *, size_t, DataType ty = TYPE_NONE) const;
 
    // print with indirect values