-LiveIntervals::getSpillWeight(bool isDef, bool isUse, unsigned loopDepth) {
- // Limit the loop depth ridiculousness.
- if (loopDepth > 200)
- loopDepth = 200;
-
- // The loop depth is used to roughly estimate the number of times the
- // instruction is executed. Something like 10^d is simple, but will quickly
- // overflow a float. This expression behaves like 10^d for small d, but is
- // more tempered for large d. At d=200 we get 6.7e33 which leaves a bit of
- // headroom before overflow.
- // By the way, powf() might be unavailable here. For consistency,
- // We may take pow(double,double).
- float lc = std::pow(1 + (100.0 / (loopDepth + 10)), (double)loopDepth);
-
- return (isDef + isUse) * lc;
+LiveIntervals::getSpillWeight(bool isDef, bool isUse, BlockFrequency freq) {
+ const float Scale = 1.0f / BlockFrequency::getEntryFrequency();
+ return (isDef + isUse) * (freq.getFrequency() * Scale);