idea: use monomorphic inline cache slot to speed up object arg/ret type check

[ndossche]

No description provided.

[github-actions]

AWS x86_64 (c6id.metal)

Attribute	Value
Environment	aws
Instance type	c6id.metal
Architecture	x86_64
CPU	Intel(R) Xeon(R) Platinum 8375C CPU @ 2.90GHz, 64 cores @ 2900 MHz
CPU settings	disabled deeper C-states, disabled turbo boost, disabled hyper-threading
RAM	251 GB
Kernel	6.18.38-76.139.amzn2023.x86_64
OS	Amazon Linux 2023.12.20260727
GCC	14.2.1
Time	2026-08-23 22:24:21 UTC
Job details	https://github.com/php/php-src/actions/runs/32670461798 (Artifacts)
Changeset	https://github.com/php/php-src/compare/c96900ee74..fea00b464b

Laravel 12.11.0 demo app - 50 iterations, 50 warmups, 100 requests (sec)

PHP	Min	Max	Std dev	Rel std dev %	Mean	Mean diff %	Median	Median diff %	Skewness	Z-stat	P-value	Memory
PHP - baseline@c96900e	0.37051	0.37168	0.00025	0.07%	0.37089	0.00%	0.37082	0.00%	1.346	0.000	1.000	25.67 MB
PHP - baseline@c96900e (JIT)	0.34922	0.35067	0.00027	0.08%	0.34967	-5.72%	0.34961	-5.72%	1.146	8.614	0.000	25.78 MB
PHP - perf-recv-test	0.36942	0.37106	0.00031	0.08%	0.37001	-0.24%	0.36990	-0.25%	1.580	8.007	0.000	25.74 MB

Symfony 2.8.0 demo app - 50 iterations, 50 warmups, 100 requests (sec)

PHP	Min	Max	Std dev	Rel std dev %	Mean	Mean diff %	Median	Median diff %	Skewness	Z-stat	P-value	Memory
PHP - baseline@c96900e	0.66261	0.66951	0.00093	0.14%	0.66859	0.00%	0.66870	0.00%	-5.589	0.000	1.000	25.79 MB
PHP - baseline@c96900e (JIT)	0.64029	0.64315	0.00047	0.07%	0.64089	-4.14%	0.64081	-4.17%	2.508	8.614	0.000	26.30 MB
PHP - perf-recv-test	0.67503	0.67727	0.00057	0.08%	0.67596	1.10%	0.67579	1.06%	0.849	-8.614	0.000	25.76 MB

Wordpress 6.9 main page - 50 iterations, 20 warmups, 20 requests (sec)

PHP	Min	Max	Std dev	Rel std dev %	Mean	Mean diff %	Median	Median diff %	Skewness	Z-stat	P-value	Memory
PHP - baseline@c96900e	0.58724	0.59242	0.00095	0.16%	0.58857	0.00%	0.58838	0.00%	2.049	0.000	1.000	26.35 MB
PHP - baseline@c96900e (JIT)	0.51594	0.52107	0.00115	0.22%	0.51719	-12.13%	0.51701	-12.13%	1.752	8.614	0.000	26.42 MB
PHP - perf-recv-test	0.58633	0.59000	0.00075	0.13%	0.58723	-0.23%	0.58704	-0.23%	2.140	7.145	0.000	26.32 MB

bench.php - 50 iterations, 20 warmups, 2 requests (sec)

PHP	Min	Max	Std dev	Rel std dev %	Mean	Mean diff %	Median	Median diff %	Skewness	Z-stat	P-value	Memory
PHP - baseline@c96900e	0.45104	0.45430	0.00066	0.15%	0.45238	0.00%	0.45240	0.00%	0.157	0.000	1.000	26.35 MB
PHP - baseline@c96900e (JIT)	0.14415	0.14490	0.00015	0.10%	0.14455	-68.05%	0.14458	-68.04%	-0.364	8.614	0.000	26.42 MB
PHP - perf-recv-test	0.44916	0.45401	0.00080	0.18%	0.45152	-0.19%	0.45145	-0.21%	0.106	5.360	0.000	26.32 MB

micro_bench.php - 50 iterations, 5 warmups, 1 request (sec)

PHP	Min	Max	Std dev	Rel std dev %	Mean	Mean diff %	Median	Median diff %	Skewness	Z-stat	P-value	Memory
PHP - baseline@c96900e	1.29083	1.30933	0.00364	0.28%	1.29729	0.00%	1.29718	0.00%	0.842	0.000	1.000	26.35 MB
PHP - baseline@c96900e (JIT)	0.56605	0.59618	0.00631	1.10%	0.57609	-55.59%	0.57526	-55.65%	0.806	8.614	0.000	26.42 MB
PHP - perf-recv-test	1.28882	1.30307	0.00326	0.25%	1.29549	-0.14%	1.29484	-0.18%	0.429	2.627	0.009	26.32 MB