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cpu: Track flat register indices in the Minor CPU with a vector.

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That avoids having to know the maximum number of dest registers there
can be in any instruction, and will likely not affect the performance of
the Minor CPU overall.

Change-Id: I4e49695ba06365d52eb4ce128d5cbb30db665bd7
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/38387
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Maintainer: Giacomo Travaglini <giacomo.travaglini@arm.com>
This commit is contained in:
Gabe Black
2020-12-07 17:43:58 -08:00
parent 08aa5351c0
commit 776822d147
4 changed files with 18 additions and 16 deletions
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17
src/cpu/minor/fetch2.cc
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@@ -356,7 +356,8 @@ Fetch2::evaluate()
/* Make a new instruction and pick up the line, stream,
* prediction, thread ids from the incoming line */
dyn_inst = new MinorDynInst(line_in->id);
dyn_inst = new MinorDynInst(
StaticInst::nullStaticInstPtr, line_in->id);
/* Fetch and prediction sequence numbers originate here */
dyn_inst->id.fetchSeqNum = fetch_info.fetchSeqNum;
@@ -393,9 +394,15 @@ Fetch2::evaluate()
* instructions longer than sizeof(MachInst) */
if (decoder->instReady()) {
/* Note that the decoder can update the given PC.
* Remember not to assign it until *after* calling
* decode */
StaticInstPtr decoded_inst =
decoder->decode(fetch_info.pc);
/* Make a new instruction and pick up the line, stream,
* prediction, thread ids from the incoming line */
dyn_inst = new MinorDynInst(line_in->id);
dyn_inst = new MinorDynInst(decoded_inst, line_in->id);
/* Fetch and prediction sequence numbers originate here */
dyn_inst->id.fetchSeqNum = fetch_info.fetchSeqNum;
@@ -404,12 +411,6 @@ Fetch2::evaluate()
* has not been set */
assert(dyn_inst->id.execSeqNum == 0);
/* Note that the decoder can update the given PC.
* Remember not to assign it until *after* calling
* decode */
StaticInstPtr decoded_inst = decoder->decode(fetch_info.pc);
dyn_inst->staticInst = decoded_inst;
dyn_inst->pc = fetch_info.pc;
DPRINTF(Fetch, "decoder inst %s\n", *dyn_inst);