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Limit P6 pipeline throughput to 3 uOPs/cycle

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This commit is contained in:
SarahW 2020-06-25 19:47:10 +01:00
commit 4fd7305d1d
1 changed files with 22 additions and 1 deletions
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23
src/codegen_timing_p6.c
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@ -1606,8 +1606,26 @@ static p6_unit_t units[] =
}; };
const int nr_units = (sizeof(units) / sizeof(p6_unit_t)); const int nr_units = (sizeof(units) / sizeof(p6_unit_t));
static int rat_timestamp = 0;
static int rat_uops = 0;
static int uop_run(const p6_uop_t *uop, int decode_time) static int uop_run(const p6_uop_t *uop, int decode_time)
{ {
/*Peak of 3 uOPs from decode to RAT per cycle*/
if (decode_time < rat_timestamp)
decode_time = rat_timestamp;
else if (decode_time > rat_timestamp)
{
rat_timestamp = decode_time;
rat_uops = 0;
}
rat_uops++;
if (rat_uops == 3)
{
rat_timestamp++;
rat_uops = 0;
}
#if 0 #if 0
int c; int c;
p6_unit_t *best_unit = NULL; p6_unit_t *best_unit = NULL;
@ -1908,7 +1926,10 @@ void codegen_timing_p6_block_start()
decode_timestamp = 0; decode_timestamp = 0;
last_complete_timestamp = 0; last_complete_timestamp = 0;
rat_timestamp = 0;
rat_uops = 0;
for (c = 0; c < NR_REGS; c++) for (c = 0; c < NR_REGS; c++)
reg_available_timestamp[c] = 0; reg_available_timestamp[c] = 0;
for (c = 0; c < 8; c++) for (c = 0; c < 8; c++)