Branch Predictor Animations Bi-modal, Local, Global CS450/650 Winter 2013 Andrew Morton.

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Branch Predictor Animations Bi-modal, Local, Global CS450/650 Winter 2013 Andrew Morton

Code Example 1 int i=0, j=3; 2 do { 3 j += 3; 4 b1: if(i == 0) 5 j %= 5; 6 b2: if(j < 2) 7 j++; 8 i++; 9 b3: } while(i<2); lineijb1b2b3 103 lineijb1b2b lineijb1b2b lineijb1b2b lineijb1b2b lineijb1b2b lineijb1b2b lineijb1b2b lineijb1b2b lineijb1b2b lineijb1b2b lineijb1b2b lineijb1b2b

Bimodal Predictor (b2) individual 2-bit up/down counter – initial state = 10 lineijb1b2b xx 10 xx counters PC 0110

Local Predictor (b2) shared 2-bit up/down counters – initial states = 10 individual local histories – initialized to 11 lineijb1b2b counters PC10 local histories 11 xx

Global Predictor (b1,b2,b3) shared 2-bit up/down counters – initial states = 10 one global history – initialized to 11 lineijb1b2b counters PC10 global history