Refactor benchmarking to self-contained C implementation

- Add mknes_bench.c with direct PMC access via perf_event_open()
- Remove dependency on external perf/awk for statistics
- Add RT priority and CPU affinity control in C code
- Use static BSS allocation (page-aligned) instead of malloc
- Add stalled-cycles-backend counter (gracefully handles AMD unavailability)
- Add throughput metrics (MIPS, Mcycles/sec)
- Optimize Bench.sh to only regenerate profile data when needed
- Add -n and -f flags for configurable runs and frames
- Suppress mapper messages during benchmark
- ~6x faster benchmark workflow (20s first run, 16s subsequent)

1 files changed, 2 insertions, 0 deletions

diff --git a/mknes_mapper.c b/mknes_mapper.c
index 32e8017..4202769 100644
--- a/mknes_mapper.c
+++ b/mknes_mapper.c
@@ -91,7 +91,9 @@ static void mapper_reset(struct nes_state *state) {
 
 static void mapper_setup(struct nes_state *state) {
 	uint32_t mapper_id = state->ines.mapper << 4 | state->ines.submapper;
+#ifndef BENCHMARK
 	printf("Mapper %d_%x requested.\n", state->ines.mapper, state->ines.submapper);
+#endif
 
 	mapper_reset(state);