Branch Predictor Animations

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Branch Predictor Animations Bimodal, Local, Global CS 450/650, ECE 621 Andrew Morton

Code Example line i j b1 b2 b3 1 3 6 4 NT 5 7 2 8 9 T line i j b1 b2 3 6 4 NT 5 7 2 8 9 T line i j b1 b2 b3 1 3 6 4 NT 5 7 2 8 9 T line i j b1 b2 b3 1 3 6 4 NT 5 7 2 8 9 T line i j b1 b2 b3 1 3 6 4 NT 5 7 2 8 9 T line i j b1 b2 b3 1 3 6 4 NT 5 7 2 8 9 T line i j b1 b2 b3 1 3 6 4 NT 5 7 2 8 9 T line i j b1 b2 b3 1 3 6 4 NT 5 7 2 8 line i j b1 b2 b3 1 3 6 4 NT 5 7 2 line i j b1 b2 b3 1 3 line i j b1 b2 b3 1 3 6 line i j b1 b2 b3 1 3 6 4 NT line i j b1 b2 b3 1 3 6 4 NT 5 line i j b1 b2 b3 1 3 6 4 NT 5 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);

Bimodal Predictor (b2) individual 2-bit up/down counter counters xx PC line i j b1 b2 b3 1 3 6 4 NT 5 7 2 8 9 T individual 2-bit up/down counter initial state = 10 counters xx PC 10 01 10 xx xx

Local Predictor (b2) shared 2-bit up/down counters line i j b1 b2 b3 1 3 6 4 NT 5 7 2 8 9 T shared 2-bit up/down counters initial states = 10 individual local histories initialized to 11 local histories counters xx 10 PC 11 01 10 10 xx 11 10 xx 10 01

Global Predictor (b1,b2,b3) line i j b1 b2 b3 1 3 6 4 NT 5 7 2 8 9 T shared 2-bit up/down counters initial states = 10 one global history initialized to 11 counters global history 11 10 PC 11 01 00 10 10 10 01 10 01