44 lines
960 B
C
44 lines
960 B
C
#include <stdint.h>
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#include <stdbool.h>
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#define OUTPORT 0x10000000
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static void print_str(const char *p)
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{
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while (*p != 0)
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*((volatile uint32_t*)OUTPORT) = *(p++);
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}
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static void print_dec(int val, int digits, bool zero_pad)
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{
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char buffer[32];
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char *p = buffer;
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while (val || digits > 0) {
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if (val)
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*(p++) = '0' + val % 10;
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else
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*(p++) = zero_pad ? '0' : ' ';
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val = val / 10;
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digits--;
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}
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while (p != buffer) {
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if (p[-1] == ' ' && p[-2] == ' ') p[-1] = '.';
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*((volatile uint32_t*)OUTPORT) = *(--p);
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}
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}
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void stats()
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{
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int num_cycles, num_instr;
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asm("rdcycle %0; rdinstret %1;" : "=r"(num_cycles), "=r"(num_instr));
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print_str("Cycle counter ........");
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print_dec(num_cycles, 8, false);
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print_str("\nInstruction counter ..");
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print_dec(num_instr, 8, false);
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print_str("\nCPI: ");
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print_dec((num_cycles / num_instr), 0, false);
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print_str(".");
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print_dec(((100 * num_cycles) / num_instr) % 100, 2, true);
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print_str("\n");
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}
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