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coremark now only uses performance data from the timed core to compute the average CPI

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This commit is contained in:
stnolting 2020-07-17 17:17:56 +02:00
parent 42901e2f16
commit ee790a973d
1 changed files with 6 additions and 11 deletions
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17
sw/example/coremark/core_portme.c
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@ -71,7 +71,9 @@ CORE_TICKS elapsed_cycles; // NEORV32 specific
or zeroing some system parameters - e.g. setting the cpu clocks cycles to 0.
*/
void start_time(void) {
elapsed_cycles = neorv32_cpu_get_cycle();
elapsed_cycles = 0; // this is time zero
neorv32_cpu_set_mcycle(0);
neorv32_cpu_set_minstret(0);
//GETMYTIME(&start_time_val );
}
/* Function : stop_time
@ -146,24 +148,17 @@ void portable_fini(core_portable *p)
p->portable_id=0;
// show executed instructions, required cycles and resulting average CPI
union {
uint64_t uint64;
uint32_t uint32[sizeof(uint64_t)/2];
} exe_cycles;
union {
uint64_t uint64;
uint32_t uint32[sizeof(uint64_t)/2];
} exe_instructions, exe_time;
exe_time.uint64 = (uint64_t)elapsed_cycles;
exe_cycles.uint64 = neorv32_cpu_get_cycle();
exe_instructions.uint64 = neorv32_cpu_get_instret();
neorv32_uart_printf("\nNEORV32: Executed instructions 0x%x_%x\n", (uint32_t)exe_instructions.uint32[1], (uint32_t)exe_instructions.uint32[0]);
neorv32_uart_printf("NEORV32: Total required clock cycles 0x%x_%x\n", (uint32_t)exe_cycles.uint32[1], (uint32_t)exe_cycles.uint32[0]);
neorv32_uart_printf("NEORV32: CoreMark core clock cycles 0x%x_%x\n", (uint32_t)exe_time.uint32[1], (uint32_t)exe_time.uint32[0]);
neorv32_uart_printf("\nNEORV32: Executed instructions 0x%x_%x\n", (uint32_t)exe_instructions.uint32[1], (uint32_t)exe_instructions.uint32[0]);
neorv32_uart_printf("NEORV32: CoreMark core clock cycles 0x%x_%x\n", (uint32_t)exe_time.uint32[1], (uint32_t)exe_time.uint32[0]);
uint64_t average_cpi = exe_cycles.uint64 / exe_instructions.uint64;
uint64_t average_cpi = exe_time.uint64 / exe_instructions.uint64;
neorv32_uart_printf("NEORV32: Average CPI (integer part only): %u cycles/instruction\n", (uint32_t)average_cpi);
}