This patch does not effect any behavior of the current code.
The codebase implicitly implies that `Cost::RateFormula` is only called
when the `Cost` is not in losing status, or else there may be possible
to trigger the assertion of `Cost::isValid`.
The intention here is to prevent mis-use where future development
allow `Cost` that is already loser to call `Cost::RateFormula` - Early
exit when `Cost` is already losing.
Reviewed By: Meinersbur, #loopoptwg
Differential Revision: https://reviews.llvm.org/D125670
const DenseSet<const SCEV *> &VisitedRegs,
const LSRUse &LU,
SmallPtrSetImpl<const SCEV *> *LoserRegs) {
+ if (isLoser())
+ return;
assert(F.isCanonical(*L) && "Cost is accurate only for canonical formula");
// Tally up the registers.
unsigned PrevAddRecCost = C.AddRecCost;