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Fix compile-breaking ane_print_platform signature + hardcoded peak TFLOPS #4

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Fix compile-breaking ane_print_platform signature + hardcoded peak TFLOPS #4

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f14a5de
feat: M2 backward compatibility — dynamic ANE platform detection
codegen-sh[bot] Mar 2, 2026
0ff3b3a
Fix compile-breaking ane_print_platform signature + hardcoded peak TF…
codegen-sh[bot] Mar 3, 2026
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9 changes: 6 additions & 3 deletions inmem_peak.m
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,7 @@
#import <dlfcn.h>
#import <mach/mach_time.h>
#import <IOSurface/IOSurface.h>
#include "training/ane_compat.h"

static mach_timebase_info_data_t g_tb;
static double ticksToMs(uint64_t t) { return (double)t * g_tb.numer / g_tb.denom / 1e6; }
Expand All @@ -27,8 +28,8 @@

NSString *genMIL(int ch, int sp, int depth) {
NSMutableString *m = [NSMutableString string];
[m appendString:@"program(1.3)\n[buildInfo = dict<string, string>({{\"coremlc-component-MIL\", \"3510.2.1\"}, {\"coremlc-version\", \"3505.4.1\"}, {\"coremltools-component-milinternal\", \"\"}, {\"coremltools-version\", \"9.0\"}})]\n{\n"];
[m appendFormat:@" func main<ios18>(tensor<fp32, [1, %d, 1, %d]> x) {\n", ch, sp];
[m appendFormat:@"program(%s)\n[buildInfo = dict<string, string>({{\"coremlc-component-MIL\", \"\"}, {\"coremlc-version\", \"\"}, {\"coremltools-component-milinternal\", \"\"}, {\"coremltools-version\", \"\"}})]\n{\n", g_ane_platform.mil_program];
[m appendFormat:@" func main<%s>(tensor<fp32, [1, %d, 1, %d]> x) {\n", ane_mil_target(), ch, sp];
[m appendString:@" string c_pad_type_0 = const()[name = string(\"c_pad_type_0\"), val = string(\"valid\")];\n"
@" tensor<int32, [2]> c_strides_0 = const()[name = string(\"c_strides_0\"), val = tensor<int32, [2]>([1, 1])];\n"
@" tensor<int32, [4]> c_pad_0 = const()[name = string(\"c_pad_0\"), val = tensor<int32, [4]>([0, 0, 0, 0])];\n"
Expand Down Expand Up @@ -89,6 +90,8 @@
int main() {
mach_timebase_info(&g_tb);
dlopen("/System/Library/PrivateFrameworks/AppleNeuralEngine.framework/AppleNeuralEngine",RTLD_NOW);
ane_detect_platform();
ane_print_platform();
printf("=== Programmatic MIL → In-Memory ANE Peak ===\n\n");
printf("%-28s %7s %7s %9s %7s %6s\n","Config","W(MB)","GFLOP","ms/eval","TFLOPS","%%peak");
printf("----------------------------------------------------------------------\n");
Expand All @@ -104,7 +107,7 @@ int main() {
char l[64]; snprintf(l,64,"%dx conv %dch sp%d",d,c,s);
double ms=bench(c,s,d);
double tf=ms>0?gf/ms:0;
if(ms>0)printf("%-28s %6.1f %6.2f %7.3f ms %6.2f %5.1f%%\n",l,w,gf,ms,tf,tf/0.019*100);
if(ms>0)printf("%-28s %6.1f %6.2f %7.3f ms %6.2f %5.1f%%\n",l,w,gf,ms,tf,tf/ane_peak_tflops()*100);
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Good catch fixing this — tf/0.019*100 completely defeats the purpose of dynamic chip detection. Using ane_peak_tflops() here is obviously correct. 👍

else printf("%-28s %6.1f %6.2f FAIL(%.0f)\n",l,w,gf,ms);
}
return 0;
Expand Down
224 changes: 224 additions & 0 deletions training/ane_compat.h
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Original file line number Diff line number Diff line change
@@ -0,0 +1,224 @@
// ane_compat.h — Runtime platform detection for Apple Silicon ANE compatibility
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This is a slick piece of engineering — runtime chip detection, per-platform TFLOPS, dynamic MIL target selection. Genuinely well-designed infrastructure.

However, there's a critical gap: ane_compat.h dynamically selects the MIL spec version (ios16/ios17/ios18) based on macOS version, but the actual MIL body syntax in the templates still uses the M4-era shorthand scalar constructors:

string("x")      // M4+ only — older CoreML parsers reject this
bool(false)       // M4+ only
int32(1)          // M4+ only
uint64(64)        // M4+ only

On M1/M2 (macOS 13/14), even with ios16 as the target, the CoreML compiler will choke on these shorthand forms. PR #3 addressed this by converting to the canonical verbose forms:

tensor<string, []>("x")
tensor<bool, []>(false)
tensor<int32, []>(1)
tensor<uint64, []>(64)

So right now, ane_compat.h is necessary-but-not-sufficient for M1/M2. The target selection is correct; the MIL body syntax is the remaining barrier.

Also, the cast op between fp32↔fp16 still fails on M1/M2 ANE hardware regardless of syntax — PR #3 added an fp16 I/O fallback for that. This PR has no such mechanism.

// Detects chip family, macOS version, ANE peak TFLOPS, and appropriate MIL target
#pragma once
#import <Foundation/Foundation.h>
#include <sys/sysctl.h>
#include <string.h>
#include <stdio.h>

// Chip family enumeration
typedef enum {
ANE_CHIP_UNKNOWN = 0,
ANE_CHIP_M1,
ANE_CHIP_M1_PRO,
ANE_CHIP_M1_MAX,
ANE_CHIP_M1_ULTRA,
ANE_CHIP_M2,
ANE_CHIP_M2_PRO,
ANE_CHIP_M2_MAX,
ANE_CHIP_M2_ULTRA,
ANE_CHIP_M3,
ANE_CHIP_M3_PRO,
ANE_CHIP_M3_MAX,
ANE_CHIP_M3_ULTRA,
ANE_CHIP_M4,
ANE_CHIP_M4_PRO,
ANE_CHIP_M4_MAX,
ANE_CHIP_M4_ULTRA,
ANE_CHIP_M5,
ANE_CHIP_M5_PRO,
ANE_CHIP_M5_MAX,
ANE_CHIP_M5_ULTRA,
} ANEChipFamily;

// Platform info resolved at runtime
typedef struct {
ANEChipFamily chip;
char chip_name[64]; // e.g. "Apple M4"
int macos_major; // e.g. 14, 15
int macos_minor; // e.g. 0, 1
double ane_peak_tflops; // Estimated FP16 peak TFLOPS
const char *mil_target; // "ios16", "ios17", or "ios18"
const char *mil_program; // "1.0" for ios16/17, "1.3" for ios18
bool api_available; // Whether _ANEInMemoryModel is available
} ANEPlatform;

// Global platform info (set once by ane_detect_platform)
static ANEPlatform g_ane_platform = {0};
static bool g_ane_platform_detected = false;

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Architecture note worth flagging for future: static globals in a header = every .m file that #includes this gets its own independent copy of g_ane_platform and g_ane_platform_detected. Currently fine since each .m compiles as its own binary, but if anything ever links two translation units together (e.g., a shared helper .m + a main.m), ane_detect_platform() silently runs twice and each TU can diverge.

Not blocking — this project's structure makes it safe today. But a future-proof approach would be moving the globals + detect function to a single .m implementation file and keeping only declarations in the header. Worth a // NOTE: comment at minimum.

// ---- Internal helpers ----
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Good fix — the original PR #2 declared ane_print_platform(const ANEPlatform *p) but every call site used ane_print_platform() with zero args. Changing to void with internal &g_ane_platform access plus lazy-init guard is the right call. Clean and consistent with ane_mil_target() and ane_peak_tflops().

One minor note: static globals in a header mean each translation unit gets its own copy of g_ane_platform and g_ane_platform_detected. Currently fine (single-file compilation units), but would silently break if the project ever links multiple .m files together — detection would run independently in each TU.


static ANEChipFamily _ane_identify_chip(const char *brand) {
// Match chip family from sysctl brand string (e.g. "Apple M4", "Apple M2 Pro")
if (strstr(brand, "M5 Ultra")) return ANE_CHIP_M5_ULTRA;
if (strstr(brand, "M5 Max")) return ANE_CHIP_M5_MAX;
if (strstr(brand, "M5 Pro")) return ANE_CHIP_M5_PRO;
if (strstr(brand, "M5")) return ANE_CHIP_M5;
if (strstr(brand, "M4 Ultra")) return ANE_CHIP_M4_ULTRA;
if (strstr(brand, "M4 Max")) return ANE_CHIP_M4_MAX;
if (strstr(brand, "M4 Pro")) return ANE_CHIP_M4_PRO;
if (strstr(brand, "M4")) return ANE_CHIP_M4;
if (strstr(brand, "M3 Ultra")) return ANE_CHIP_M3_ULTRA;
if (strstr(brand, "M3 Max")) return ANE_CHIP_M3_MAX;
if (strstr(brand, "M3 Pro")) return ANE_CHIP_M3_PRO;
if (strstr(brand, "M3")) return ANE_CHIP_M3;
if (strstr(brand, "M2 Ultra")) return ANE_CHIP_M2_ULTRA;
if (strstr(brand, "M2 Max")) return ANE_CHIP_M2_MAX;
if (strstr(brand, "M2 Pro")) return ANE_CHIP_M2_PRO;
if (strstr(brand, "M2")) return ANE_CHIP_M2;
if (strstr(brand, "M1 Ultra")) return ANE_CHIP_M1_ULTRA;
if (strstr(brand, "M1 Max")) return ANE_CHIP_M1_MAX;
if (strstr(brand, "M1 Pro")) return ANE_CHIP_M1_PRO;
if (strstr(brand, "M1")) return ANE_CHIP_M1;
return ANE_CHIP_UNKNOWN;
}

// Estimated FP16 ANE peak TFLOPS per chip.
// Apple publishes INT8 TOPS; FP16 throughput is roughly half.
// Values are best-effort estimates from known hardware specs.
// Ultra variants double the base die's ANE (2x neural engines).
static double _ane_peak_tflops(ANEChipFamily chip) {
switch (chip) {
case ANE_CHIP_M1: return 5.5;
case ANE_CHIP_M1_PRO: return 5.5;
case ANE_CHIP_M1_MAX: return 5.5;
case ANE_CHIP_M1_ULTRA: return 11.0;
case ANE_CHIP_M2: return 7.9; // 15.8 TOPS / 2
case ANE_CHIP_M2_PRO: return 7.9;
case ANE_CHIP_M2_MAX: return 7.9;
case ANE_CHIP_M2_ULTRA: return 15.8;
case ANE_CHIP_M3: return 9.0; // 18 TOPS / 2
case ANE_CHIP_M3_PRO: return 9.0;
case ANE_CHIP_M3_MAX: return 9.0;
case ANE_CHIP_M3_ULTRA: return 18.0;
case ANE_CHIP_M4: return 15.8; // Empirically measured in this project
case ANE_CHIP_M4_PRO: return 15.8;
case ANE_CHIP_M4_MAX: return 15.8;
case ANE_CHIP_M4_ULTRA: return 31.6;
case ANE_CHIP_M5: return 19.0; // 38 TOPS / 2 (estimate)
case ANE_CHIP_M5_PRO: return 19.0;
case ANE_CHIP_M5_MAX: return 19.0;
case ANE_CHIP_M5_ULTRA: return 38.0;
default: return 15.8; // Fallback: assume M4-class
}
}

static const char *_ane_chip_name_str(ANEChipFamily chip) {
switch (chip) {
case ANE_CHIP_M1: return "M1";
case ANE_CHIP_M1_PRO: return "M1 Pro";
case ANE_CHIP_M1_MAX: return "M1 Max";
case ANE_CHIP_M1_ULTRA: return "M1 Ultra";
case ANE_CHIP_M2: return "M2";
case ANE_CHIP_M2_PRO: return "M2 Pro";
case ANE_CHIP_M2_MAX: return "M2 Max";
case ANE_CHIP_M2_ULTRA: return "M2 Ultra";
case ANE_CHIP_M3: return "M3";
case ANE_CHIP_M3_PRO: return "M3 Pro";
case ANE_CHIP_M3_MAX: return "M3 Max";
case ANE_CHIP_M3_ULTRA: return "M3 Ultra";
case ANE_CHIP_M4: return "M4";
case ANE_CHIP_M4_PRO: return "M4 Pro";
case ANE_CHIP_M4_MAX: return "M4 Max";
case ANE_CHIP_M4_ULTRA: return "M4 Ultra";
case ANE_CHIP_M5: return "M5";
case ANE_CHIP_M5_PRO: return "M5 Pro";
case ANE_CHIP_M5_MAX: return "M5 Max";
case ANE_CHIP_M5_ULTRA: return "M5 Ultra";
default: return "Unknown";
}
}

// ---- Public API ----

// Detect the current platform. Call once at startup.
// Returns the populated ANEPlatform struct (also stored in g_ane_platform).
static ANEPlatform ane_detect_platform(void) {
if (g_ane_platform_detected) return g_ane_platform;

ANEPlatform p = {0};

// 1. Detect chip via sysctl
char brand[128] = {0};
size_t len = sizeof(brand);
if (sysctlbyname("machdep.cpu.brand_string", brand, &len, NULL, 0) != 0) {
// Fallback: try hw.machine or hw.model
len = sizeof(brand);
sysctlbyname("hw.model", brand, &len, NULL, 0);
}
strncpy(p.chip_name, brand, sizeof(p.chip_name) - 1);
p.chip = _ane_identify_chip(brand);

// 2. Detect macOS version
NSOperatingSystemVersion ver = [[NSProcessInfo processInfo] operatingSystemVersion];
p.macos_major = (int)ver.majorVersion;
p.macos_minor = (int)ver.minorVersion;

// 3. Set ANE peak TFLOPS
p.ane_peak_tflops = _ane_peak_tflops(p.chip);

// 4. Select MIL target based on macOS version
// - macOS 15+ (Sequoia) → ios18 + program(1.3)
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The MIL target selection logic keys off macos_major alone, which is correct for the current matrix (13→ios16, 14→ios17, 15→ios18). However, this means macOS 16+ (whatever ships with M5-era hardware) will also get ios18 + program(1.3).

That's likely fine as a conservative fallback (newer CoreML should be backward-compatible with ios18 targets), but worth noting that if Apple introduces an ios19 MIL target with macOS 16, this function won't automatically pick it up. The mil_program might also bump (e.g., 1.4).

A defensive option: add // TODO: update when macOS 16 / ios19 target is known here so it doesn't silently regress.

// - macOS 14 (Sonoma) → ios17 + program(1.0)
// - macOS 13 (Ventura) → ios16 + program(1.0)
// - older → unsupported
if (p.macos_major >= 15) {
p.mil_target = "ios18";
p.mil_program = "1.3";
} else if (p.macos_major == 14) {
p.mil_target = "ios17";
p.mil_program = "1.0";
} else if (p.macos_major == 13) {
p.mil_target = "ios16";
p.mil_program = "1.0";
} else {
p.mil_target = "ios16";
p.mil_program = "1.0";
}

// 5. Check API availability
p.api_available = (NSClassFromString(@"_ANEInMemoryModelDescriptor") != nil &&
NSClassFromString(@"_ANEInMemoryModel") != nil);

g_ane_platform = p;
g_ane_platform_detected = true;
return p;
}

// Print detected platform info (call after ane_detect_platform)
static void ane_print_platform(void) {
if (!g_ane_platform_detected) ane_detect_platform();
const ANEPlatform *p = &g_ane_platform;
printf("=== ANE Platform ===\n");
printf(" Chip: %s (%s)\n", _ane_chip_name_str(p->chip), p->chip_name);
printf(" macOS: %d.%d\n", p->macos_major, p->macos_minor);
printf(" ANE peak: %.1f TFLOPS (FP16 est.)\n", p->ane_peak_tflops);
printf(" MIL target: %s (program %s)\n", p->mil_target, p->mil_program);
printf(" API ready: %s\n", p->api_available ? "YES" : "NO");
printf("====================\n");
}

// Generate the MIL header string with correct program version and build info.
// Returns an autoreleased NSString.
static NSString *ane_mil_header(void) {
if (!g_ane_platform_detected) ane_detect_platform();
return [NSString stringWithFormat:
@"program(%s)\n"
"[buildInfo = dict<string, string>({{\"coremlc-component-MIL\", \"\"}, "
"{\"coremlc-version\", \"\"}, {\"coremltools-component-milinternal\", \"\"}, "
"{\"coremltools-version\", \"\"}})]\n{\n",
g_ane_platform.mil_program];
}

// Get the MIL function target annotation (e.g. "ios17" or "ios18")
static const char *ane_mil_target(void) {
if (!g_ane_platform_detected) ane_detect_platform();
return g_ane_platform.mil_target;
}

// Get the ANE peak TFLOPS for utilization calculations
static double ane_peak_tflops(void) {
if (!g_ane_platform_detected) ane_detect_platform();
return g_ane_platform.ane_peak_tflops;
}
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