If clang can see the definition of `constFunc` and deduce that its parameters are `noescape`, then I think it can avoid reloading `x`. A recent optimization in

If clang can see the definition of `constFunc` and deduce that its parameters are `noescape`, then I think it can avoid reloading `x`. A recent optimization in clang (not sure if it's in clang-9 or clang-10) will remove memsets to variables declared const, which usually come from assigning through a pointer that's had const (of the pointed to type) casted away. The MIPS Linux kernel won't boot when built with clang due to the above (I sent a patch 2 weeks ago)