TFG-benchmarks/zicond_micro/zicond.c

#include <stdint.h>

#define N 128
#define ITERATIONS 1

// Static "messy" data to ensure the branch predictor cannot "learn" the pattern
static const uint64_t src_a[N] = {
    0, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1, 1, 0, 0, 1, 0, 0, 1, 1, 0, 1, 1, 0, 1, 0, 0, 1, 1, 1, 0, 0, 1,
    1, 0, 0, 1, 1, 0, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1, 0, 1, 1, 0, 0, 1, 0, 1, 1, 1, 0, 0, 0, 1, 0, 1,
    0, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1, 1, 0, 0, 1, 0, 0, 1, 1, 0, 1, 1, 0, 1, 0, 0, 1, 1, 1, 0, 0, 1,
    1, 0, 0, 1, 1, 0, 1, 1, 0, 1, 0, 0, 1, 0, 1, 1, 0, 1, 1, 0, 0, 1, 0, 1, 1, 1, 0, 0, 0, 1, 0, 1
};

static const uint64_t src_b[N] = {
    10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160,
    170, 180, 190, 200, 210, 220, 230, 240, 250, 260, 270, 280, 290, 300, 310, 320,
    330, 340, 350, 360, 370, 380, 390, 400, 410, 420, 430, 440, 450, 460, 470, 480,
    490, 500, 510, 520, 530, 540, 550, 560, 570, 580, 590, 600, 610, 620, 630, 640,
    650, 660, 670, 680, 690, 700, 710, 720, 730, 740, 750, 760, 770, 780, 790, 800,
    810, 820, 830, 840, 850, 860, 870, 880, 890, 900, 910, 920, 930, 940, 950, 960,
    970, 980, 990, 1000, 1010, 1020, 1030, 1040, 1050, 1060, 1070, 1080, 1090, 1100, 1110, 1120,
    1130, 1140, 1150, 1160, 1170, 1180, 1190, 1200, 1210, 1220, 1230, 1240, 1250, 1260, 1270, 1280
};

volatile uint64_t results[N];

static inline uint64_t read_cycles() {
    uint64_t val;
    asm volatile ("rdcycle %0" : "=r"(val));
    return val;
}

int main() {
    read_cycles();
    for (int j = 0; j < ITERATIONS; j++) {
        for (int i = 0; i < N; i++) {
            uint64_t a = src_a[i];
            uint64_t b = src_b[i];

            results[i] = (a != 0) ? b : 0;
        }
    }
    read_cycles();

    read_cycles();
    for (int j = 0; j < ITERATIONS; j++) {
        for (int i = 0; i < N; i++) {
            uint64_t a = src_a[i];
            uint64_t b = src_b[i];

            results[i] = (a != 0) ? b : 0;
        }
    }
    read_cycles();

    return 0;
}