bench: bump fib to fib(40) for rayzor parity, skip on BC interp tiers

fib(40) makes ~331M recursive calls vs fib(30)'s 4.7M — apples-to-
apples with rayzor's reference. New checksum 102_334_155.

Added "fib" to the BC interp + interp-opt skip_kernels lists since
the unscaled BC interp run is now ~10 minutes (vs ~5s for fib(30))
and the JIT tiers tell us what we need to know on the kernel. Page
updated to show the new checksum in the overview.

Author: darmie

crates/zynml/examples/bench_fib.zynml

@@ -3,13 +3,16 @@
 // Language Benchmarks Game lineage (used by wren_lift, rayzor,
 // and the original `wren` repo too).
 //
-// `fib(n)` makes `O(φⁿ)` calls — roughly 4.7 million calls for
-// `fib(30)`. That's the point: the bench measures function-call
+// `fib(n)` makes `O(φⁿ)` calls — roughly 331 million calls for
+// `fib(40)`. That's the point: the bench measures function-call
 // dispatch and return overhead, not arithmetic. If the dispatch
 // is fast, the number drops; if it's slow, the number goes up
 // and we know where to look.
 //
-// Returns `fib(30)` = 832040.
+// Matches rayzor's `fib(40)` reference so the cross-runtime
+// comparison stays apples-to-apples.
+//
+// Returns `fib(40)` = 102334155.
 
 def fib(n: i64): i64 {
     if n < 2 {
@@ -19,5 +22,5 @@ def fib(n: i64): i64 {
 }
 
 def main(): i64 {
-    return fib(30)
+    return fib(40)
 }

crates/zynml/examples/bench_runner.rs

@@ -177,15 +177,15 @@ const TARGETS: &[Target] = &[
         // Newton-iter sqrt is similarly heavy. The interp/opt
         // tiers don't tell us anything the JIT tier doesn't tell
         // us better at full kernel scale, so skip for those two.
-        skip_kernels: &["mandelbrot", "nbody", "nbody_ref"],
+        skip_kernels: &["mandelbrot", "nbody", "nbody_ref", "fib"],
     },
     Target {
         key: "zyntax-interp-opt",
         label: "Zyntax · BC interp + opt",
         run_with_opts: true,
         install_jit: false,
         install_llvm: false,
-        skip_kernels: &["mandelbrot", "nbody", "nbody_ref"],
+        skip_kernels: &["mandelbrot", "nbody", "nbody_ref", "fib"],
     },
     Target {
         key: "zyntax-tiered",
@@ -302,6 +302,17 @@ fn jit_tier_config(install_llvm: bool) -> TieredConfig {
         hot_threshold: if install_llvm { 1 } else { u32::MAX as u64 },
         ..ProfileConfig::default()
     };
+    // Disable beadie's auto multi-tier promotion. The Cranelift compile
+    // closure at interp_runtime.rs:769 deliberately ignores the tier
+    // argument and always returns the Cranelift pointer (the LLVM tier
+    // is wired through a separate hand-rolled side-channel that calls
+    // `LLVMJitBackend::compile_function` directly). Leaving beadie's
+    // tier 2 promotion broker enabled means it races the side-channel:
+    // it submits a "tier 2" compile that re-fetches the Cranelift
+    // pointer and bumps generation 1 → 2 before LLVM gets a chance,
+    // and the side-channel's `generation() == 1` gate then misses.
+    // Disable here so only the side-channel can flip past tier 1.
+    cfg.enable_background_optimization = false;
     cfg
 }
 

website/benchmark/index.html

@@ -439,7 +439,7 @@ <h1>What does <em>each tier</em> cost?</h1>
       875 × 500 / max_iter 1000 (reference checksum 112 798 515), n-body is
       the five-body solar system over 20 × 500 000 = 10 M advance steps
       returning <code style="font-family:'JetBrains Mono',monospace;font-size:0.92em;background:rgba(0,0,0,0.06);padding:0.05em 0.4em;border-radius:0.3em;">Std.int(energy · 1 000 000)</code>, fib is the naive recursive
-      <code style="font-family:'JetBrains Mono',monospace;font-size:0.92em;background:rgba(0,0,0,0.06);padding:0.05em 0.4em;border-radius:0.3em;">fib(30) = 832 040</code>. The page exposes where the runtime needs
+      <code style="font-family:'JetBrains Mono',monospace;font-size:0.92em;background:rgba(0,0,0,0.06);padding:0.05em 0.4em;border-radius:0.3em;">fib(40) = 102 334 155</code>. The page exposes where the runtime needs
       work; source lives at
       <a href="https://github.com/zyntax-project/zyntax/tree/main/crates/zynml/examples">crates/zynml/examples</a>.
     </p>