+void BranchProbability::dump() const { print(dbgs()) << '\n'; }
+
+static uint64_t scale(uint64_t Num, uint32_t N, uint32_t D) {
+ assert(D && "divide by 0");
+
+ // Fast path for multiplying by 1.0.
+ if (!Num || D == N)
+ return Num;
+
+ // Split Num into upper and lower parts to multiply, then recombine.
+ uint64_t ProductHigh = (Num >> 32) * N;
+ uint64_t ProductLow = (Num & UINT32_MAX) * N;
+
+ // Split into 32-bit digits.
+ uint32_t Upper32 = ProductHigh >> 32;
+ uint32_t Lower32 = ProductLow & UINT32_MAX;
+ uint32_t Mid32Partial = ProductHigh & UINT32_MAX;
+ uint32_t Mid32 = Mid32Partial + (ProductLow >> 32);
+
+ // Carry.
+ Upper32 += Mid32 < Mid32Partial;