Add the optimization in a few other methods

Author: antoyo

src/builder.rs

@@ -871,22 +871,26 @@ impl<'a, 'gcc, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'gcc, 'tcx> {
 
     fn fadd_fast(&mut self, lhs: RValue<'gcc>, rhs: RValue<'gcc>) -> RValue<'gcc> {
         // NOTE: it seems like we cannot enable fast-mode for a single operation in GCC.
-        set_rvalue_location(self, lhs + rhs)
+        let result = set_rvalue_location(self, lhs + rhs);
+        self.assign_to_var(result)
     }
 
     fn fsub_fast(&mut self, lhs: RValue<'gcc>, rhs: RValue<'gcc>) -> RValue<'gcc> {
         // NOTE: it seems like we cannot enable fast-mode for a single operation in GCC.
-        set_rvalue_location(self, lhs - rhs)
+        let result = set_rvalue_location(self, lhs - rhs);
+        self.assign_to_var(result)
     }
 
     fn fmul_fast(&mut self, lhs: RValue<'gcc>, rhs: RValue<'gcc>) -> RValue<'gcc> {
         // NOTE: it seems like we cannot enable fast-mode for a single operation in GCC.
-        set_rvalue_location(self, lhs * rhs)
+        let result = set_rvalue_location(self, lhs * rhs);
+        self.assign_to_var(result)
     }
 
     fn fdiv_fast(&mut self, lhs: RValue<'gcc>, rhs: RValue<'gcc>) -> RValue<'gcc> {
         // NOTE: it seems like we cannot enable fast-mode for a single operation in GCC.
-        set_rvalue_location(self, lhs / rhs)
+        let result = set_rvalue_location(self, lhs / rhs);
+        self.assign_to_var(result)
     }
 
     fn frem_fast(&mut self, lhs: RValue<'gcc>, rhs: RValue<'gcc>) -> RValue<'gcc> {