Add a tailcall result

Author: Fidget-Spinner

posts/jit-reflections.md

@@ -118,8 +118,20 @@ spectral_norm: Mean +- std dev: 90.6 ms +- 0.7 ms
 richards: Mean +- std dev: 37.8 ms +- 2.4 ms
 nbody: Mean +- std dev: 104 ms +- 2 ms
 spectral_norm: Mean +- std dev: 96.0 ms +- 0.7 ms
-````
-System/Build configuration: Ubuntu 22.04, Clang 20.1.7, PGO=true, LTO=thin. Tuned with `pyperf system tune`.
+```
+System/Build configuration: Ubuntu 22.04, Clang 20.1.7, PGO=true, LTO=thin, tailcall=false. Tuned with `pyperf system tune`.
+
+Note that when I turn on tailcalling for the interpreter, these types of artificial benchmarks get slightly faster. So with tail calling, almost all the benefit of the JIT is wiped out (for now).
+
+```
+3.14 JIT Off + Tailcall:
+spectral_norm: Mean +- std dev: 90.8 ms +- 1.1 ms
+
+3.14 JIT On:
+spectral_norm: Mean +- std dev: 89.0 ms +- 0.6 ms
+```
+System/Build configuration: Ubuntu 22.04, Clang 20.1.7, PGO=true, LTO=thin, tailcall=true. Tuned with `pyperf system tune`.
+
 
 You might ask: why is the 3.14 JIT not much faster? The real answer, which 
 again hurts me to say is that the 3.14 JIT has almost no major _optimizer_*