+
+
+/// isAssociative - Return true if the instruction is associative:
+///
+/// Associative operators satisfy: x op (y op z) === (x op y) op z)
+///
+/// In LLVM, the Add, Mul, And, Or, and Xor operators are associative, when not
+/// applied to floating point types.
+///
+bool Instruction::isAssociative(unsigned Opcode, const Type *Ty) {
+ if (Opcode == Add || Opcode == Mul ||
+ Opcode == And || Opcode == Or || Opcode == Xor) {
+ // Floating point operations do not associate!
+ return !Ty->isFloatingPoint();
+ }
+ return 0;
+}
+
+/// isCommutative - Return true if the instruction is commutative:
+///
+/// Commutative operators satisfy: (x op y) === (y op x)
+///
+/// In LLVM, these are the associative operators, plus SetEQ and SetNE, when
+/// applied to any type.
+///
+bool Instruction::isCommutative(unsigned op) {
+ switch (op) {
+ case Add:
+ case Mul:
+ case And:
+ case Or:
+ case Xor:
+ case SetEQ:
+ case SetNE:
+ return true;
+ default:
+ return false;
+ }
+}
+
+/// isRelational - Return true if the instruction is a Set* instruction:
+///
+bool Instruction::isRelational(unsigned op) {
+ switch (op) {
+ case SetEQ:
+ case SetNE:
+ case SetLT:
+ case SetGT:
+ case SetLE:
+ case SetGE:
+ return true;
+ }
+ return false;
+}
+
+
+
+/// isTrappingInstruction - Return true if the instruction may trap.
+///
+bool Instruction::isTrapping(unsigned op) {
+ switch(op) {
+ case Div:
+ case Rem:
+ case Load:
+ case Store:
+ case Call:
+ case Invoke:
+ return true;
+ default:
+ return false;
+ }
+}