static int X86ThreadDispatch(X86Thread *self, int quantum) {
X86Core *core = self->core;
X86Cpu *cpu = self->cpu;
struct x86_uop_t *uop;
enum x86_dispatch_stall_t stall;
while (quantum) {
/* Check if we can decode */
stall = X86ThreadCanDispatch(self);
if (stall != x86_dispatch_stall_used) {
core->dispatch_stall[stall] += quantum;
break;
}
/* Get entry from uop queue */
uop = list_remove_at(self->uop_queue, 0);
assert(x86_uop_exists(uop));
uop->in_uop_queue = 0;
/* Rename */
X86ThreadRenameUop(self, uop);
/* Insert in ROB */
X86CoreEnqueueInROB(core, uop);
core->rob_writes++;
self->rob_writes++;
/* Non memory instruction into IQ */
if (!(uop->flags & X86_UINST_MEM)) {
X86ThreadInsertInIQ(self, uop);
core->iq_writes++;
self->iq_writes++;
}
/* Memory instructions into the LSQ */
if (uop->flags & X86_UINST_MEM) {
X86ThreadInsertInLSQ(self, uop);
core->lsq_writes++;
self->lsq_writes++;
}
/* Statistics */
core->dispatch_stall[uop->specmode ? x86_dispatch_stall_spec
: x86_dispatch_stall_used]++;
self->num_dispatched_uinst_array[uop->uinst->opcode]++;
core->num_dispatched_uinst_array[uop->uinst->opcode]++;
cpu->num_dispatched_uinst_array[uop->uinst->opcode]++;
if (uop->trace_cache) self->trace_cache->num_dispatched_uinst++;
/* Another instruction dispatched, update quantum. */
quantum--;
/* Trace */
x86_trace("x86.inst id=%lld core=%d stg=\"di\"\n", uop->id_in_core,
core->id);
}
return quantum;
}
static void x86_cpu_decode_thread(int core, int thread)
{
struct list_t *fetchq = X86_THREAD.fetch_queue;
struct list_t *uopq = X86_THREAD.uop_queue;
struct x86_uop_t *uop;
int i;
for (i = 0; i < x86_cpu_decode_width; i++)
{
/* Empty fetch queue, full uop_queue */
if (!list_count(fetchq))
break;
if (list_count(uopq) >= x86_uop_queue_size)
break;
uop = list_get(fetchq, 0);
assert(x86_uop_exists(uop));
/* If instructions come from the trace cache, i.e., are located in
* the trace cache queue, copy all of them
* into the uop queue in one single decode slot. */
if (uop->trace_cache)
{
do {
x86_fetch_queue_remove(core, thread, 0);
list_add(uopq, uop);
uop->in_uop_queue = 1;
uop = list_get(fetchq, 0);
} while (uop && uop->trace_cache);
break;
}
/* Decode one macro-instruction coming from a block in the instruction
* cache. If the cache access finished, extract it from the fetch queue. */
assert(!uop->mop_index);
if (!mod_in_flight_access(X86_THREAD.inst_mod, uop->fetch_access, uop->fetch_address))
{
do {
/* Move from fetch queue to uop queue */
x86_fetch_queue_remove(core, thread, 0);
list_add(uopq, uop);
uop->in_uop_queue = 1;
/* Trace */
x86_trace("x86.inst id=%lld core=%d stg=\"dec\"\n",
uop->id_in_core, uop->core);
/* Next */
uop = list_get(fetchq, 0);
} while (uop && uop->mop_index);
}
}
}
/* Remove the uop in the current position of the linked list representing
* the load queue of the specified thread. */
void X86ThreadRemoveFromLQ(X86Thread *self) {
X86Core *core = self->core;
struct linked_list_t *lq = self->lq;
struct x86_uop_t *uop;
uop = linked_list_get(lq);
assert(x86_uop_exists(uop));
linked_list_remove(lq);
uop->in_lq = 0;
assert(core->lsq_count && self->lsq_count);
core->lsq_count--;
self->lsq_count--;
}
struct x86_uop_t *X86CoreExtractFromEventQueue(X86Core *self)
{
struct linked_list_t *event_queue = self->event_queue;
struct x86_uop_t *uop;
if (!linked_list_count(event_queue))
return NULL;
linked_list_head(event_queue);
uop = linked_list_get(event_queue);
assert(x86_uop_exists(uop));
assert(uop->in_event_queue);
linked_list_remove(event_queue);
uop->in_event_queue = 0;
return uop;
}
/* Remove an uop in the current position of the prefetch queue */
void X86ThreadRemovePreQ(X86Thread *self) {
X86Core *core = self->core;
struct linked_list_t *preq = self->preq;
struct x86_uop_t *uop;
uop = linked_list_get(preq);
assert(x86_uop_exists(uop));
assert(uop->in_preq);
linked_list_remove(preq);
uop->in_preq = 0;
assert(core->lsq_count && self->lsq_count);
core->lsq_count--;
self->lsq_count--;
}
static int X86ThreadIssueIQ(X86Thread *self, int quant)
{
X86Cpu *cpu = self->cpu;
X86Core *core = self->core;
struct linked_list_t *iq = self->iq;
struct x86_uop_t *uop;
int lat;
/* Find instruction to issue */
linked_list_head(iq);
while (!linked_list_is_end(iq) && quant)
{
/* Get element from IQ */
uop = linked_list_get(iq);
assert(x86_uop_exists(uop));
assert(!(uop->flags & X86_UINST_MEM));
if (!uop->ready && !X86ThreadIsUopReady(self, uop))
{
linked_list_next(iq);
continue;
}
uop->ready = 1; /* avoid next call to 'X86ThreadIsUopReady' */
/* Run the instruction in its corresponding functional unit.
* If the instruction does not require a functional unit, 'X86CoreReserveFunctionalUnit'
* returns 1 cycle latency. If there is no functional unit available,
* 'X86CoreReserveFunctionalUnit' returns 0. */
lat = X86CoreReserveFunctionalUnit(core, uop);
if (!lat)
{
linked_list_next(iq);
continue;
}
/* Instruction was issued to the corresponding fu.
* Remove it from IQ */
X86ThreadRemoveFromIQ(self);
/* Schedule inst in Event Queue */
assert(!uop->in_event_queue);
assert(lat > 0);
uop->issued = 1;
uop->issue_when = asTiming(cpu)->cycle;
uop->when = asTiming(cpu)->cycle + lat;
X86CoreInsertInEventQueue(core, uop);
/* Statistics */
core->num_issued_uinst_array[uop->uinst->opcode]++;
core->iq_reads++;
core->reg_file_int_reads += uop->ph_int_idep_count;
core->reg_file_fp_reads += uop->ph_fp_idep_count;
self->num_issued_uinst_array[uop->uinst->opcode]++;
self->iq_reads++;
self->reg_file_int_reads += uop->ph_int_idep_count;
self->reg_file_fp_reads += uop->ph_fp_idep_count;
cpu->num_issued_uinst_array[uop->uinst->opcode]++;
if (uop->trace_cache)
self->trace_cache->num_issued_uinst++;
/* One more instruction issued, update quantum. */
quant--;
/* Trace */
x86_trace("x86.inst id=%lld core=%d stg=\"i\"\n",
uop->id_in_core, core->id);
}
return quant;
}
static int x86_cpu_issue_iq(int core, int thread, int quant)
{
struct linked_list_t *iq = X86_THREAD.iq;
struct x86_uop_t *uop;
int lat;
/* Find instruction to issue */
linked_list_head(iq);
while (!linked_list_is_end(iq) && quant)
{
/* Get element from IQ */
uop = linked_list_get(iq);
assert(x86_uop_exists(uop));
assert(!(uop->flags & X86_UINST_MEM));
if (!uop->ready && !x86_reg_file_ready(uop))
{
linked_list_next(iq);
continue;
}
uop->ready = 1; /* avoid next call to 'x86_reg_file_ready' */
/* Run the instruction in its corresponding functional unit.
* If the instruction does not require a functional unit, 'x86_fu_reserve'
* returns 1 cycle latency. If there is no functional unit available,
* 'x86_fu_reserve' returns 0. */
lat = x86_fu_reserve(uop);
if (!lat)
{
linked_list_next(iq);
continue;
}
/* Instruction was issued to the corresponding fu.
* Remove it from IQ */
x86_iq_remove(core, thread);
/* Schedule inst in Event Queue */
assert(!uop->in_event_queue);
assert(lat > 0);
uop->issued = 1;
uop->issue_when = x86_cpu->cycle;
uop->when = x86_cpu->cycle + lat;
x86_event_queue_insert(X86_CORE.event_queue, uop);
/* Instruction issued */
X86_CORE.issued[uop->uinst->opcode]++;
X86_CORE.iq_reads++;
X86_CORE.reg_file_int_reads += uop->ph_int_idep_count;
X86_CORE.reg_file_fp_reads += uop->ph_fp_idep_count;
X86_THREAD.issued[uop->uinst->opcode]++;
X86_THREAD.iq_reads++;
X86_THREAD.reg_file_int_reads += uop->ph_int_idep_count;
X86_THREAD.reg_file_fp_reads += uop->ph_fp_idep_count;
x86_cpu->issued[uop->uinst->opcode]++;
quant--;
/* Trace */
x86_trace("x86.inst id=%lld core=%d stg=\"i\"\n",
uop->id_in_core, uop->core);
}
return quant;
}
static int x86_cpu_dispatch_thread(int core, int thread, int quant)
{
struct x86_uop_t *uop;
enum x86_dispatch_stall_t stall;
while (quant)
{
/* Check if we can decode */
stall = x86_cpu_can_dispatch_thread(core, thread);
if (stall != x86_dispatch_stall_used)
{
X86_CORE.dispatch_stall[stall] += quant;
break;
}
/* Get entry from uop queue */
uop = list_remove_at(X86_THREAD.uop_queue, 0);
assert(x86_uop_exists(uop));
uop->in_uop_queue = 0;
/* Rename */
x86_reg_file_rename(uop);
/* Insert in ROB */
x86_rob_enqueue(uop);
X86_CORE.rob_writes++;
X86_THREAD.rob_writes++;
/* Non memory instruction into IQ */
if (!(uop->flags & X86_UINST_MEM))
{
x86_iq_insert(uop);
X86_CORE.iq_writes++;
X86_THREAD.iq_writes++;
}
/* Memory instructions into the LSQ */
if (uop->flags & X86_UINST_MEM)
{
x86_lsq_insert(uop);
X86_CORE.lsq_writes++;
X86_THREAD.lsq_writes++;
}
/* Statistics */
X86_CORE.dispatch_stall[uop->specmode ? x86_dispatch_stall_spec : x86_dispatch_stall_used]++;
X86_THREAD.num_dispatched_uinst_array[uop->uinst->opcode]++;
X86_CORE.num_dispatched_uinst_array[uop->uinst->opcode]++;
x86_cpu->num_dispatched_uinst_array[uop->uinst->opcode]++;
if (uop->trace_cache)
X86_THREAD.trace_cache->num_dispatched_uinst++;
/* Another instruction dispatched, update quantum. */
quant--;
/* Trace */
x86_trace("x86.inst id=%lld core=%d stg=\"di\"\n",
uop->id_in_core, uop->core);
}
return quant;
}
