ShatianWang 56bbf8135e [BOLT] CDSplit main logic part 1/2 (#73895) ...

This diff defines and initializes auxiliary variables used by CDSplit
and implements two important helper functions. The first helper function
approximates the block level size increase if a function is hot-warm
split at a given split index (X86 specific). The second helper function
finds all calls in the form of X->Y or Y->X for each BF given function
order [... X ... BF ... Y ...]. These calls are referred to as "cover
calls". Their distance will decrease if BF's hot fragment size is
further reduced by hot-warm splitting. NFC.

2023-11-30 20:55:36 -05:00

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