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Fixes #25 - Remove delay code

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This commit is contained in:
Stefan Arentz 2016-11-16 22:26:40 -05:00
parent 8eafb8b559
commit 79d951fb29
1 changed files with 0 additions and 30 deletions
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30
cpu.c
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@ -30,8 +30,6 @@
#include <stdlib.h>
#include <unistd.h>
#include <sys/stat.h>
#include <mach/mach.h>
#include <mach/mach_time.h>
#include "cpu.h"
#include "ins.h"
@ -218,16 +216,6 @@ static void cpu_format_stack(struct cpu_t *cpu, char *buffer) {
}
}
static mach_timebase_info_data_t timebase_info;
static uint64_t abs_to_nanos(uint64_t abs) {
return abs * timebase_info.numer / timebase_info.denom;
}
static uint64_t nanos_to_abs(uint64_t nanos) {
return nanos * timebase_info.denom / timebase_info.numer;
}
static int cpu_execute_instruction(struct cpu_t *cpu) {
/* Trace code - Refactor into its own function or module */
char trace_instruction[256];
@ -238,8 +226,6 @@ static int cpu_execute_instruction(struct cpu_t *cpu) {
cpu_format_instruction(cpu, trace_instruction);
}
uint64_t start_time = mach_absolute_time();
/* Fetch instruction */
cpu_instruction_t *i = &instructions[mem_get_byte(cpu, cpu->state.pc)];
if (i->handler == NULL) {
@ -300,22 +286,6 @@ static int cpu_execute_instruction(struct cpu_t *cpu) {
}
}
/* Delay */
if (timebase_info.denom == 0) {
(void) mach_timebase_info(&timebase_info);
}
uint64_t now = mach_absolute_time();
uint64_t elapsed_nano = abs_to_nanos(now - start_time);
uint64_t expected_duration = (i->cycles * (1000000000 / 960000));
uint64_t delay_nano = expected_duration - elapsed_nano;
//fprintf(stderr, "Expected: %" PRId64 " Elapsed: %" PRId64 " Delay: %" PRId64 "\n", expected_duration, elapsed_nano, delay_nano);
mach_wait_until(now + nanos_to_abs(delay_nano));
return 0;
}