postgres-github.git / summary / log / commit / refs

commit    effaa464afd355e8927bf430cfe6a0ddd2ee5695
Author:   John Naylor <john.naylor@postgresql.org>
Date:     Thu Apr 02 12:39:57 2026 +0000

    Check for __cpuidex and __get_cpuid_count separately
    
    Previously we would only check for the availability of __cpuidex if
    the related __get_cpuid_count was not available on a platform.
    
    Future commits will need to access hypervisor information about
    the TSC frequency of x86 CPUs. For that case __cpuidex is the only
    viable option for accessing a high leaf (e.g. 0x40000000), since
    __get_cpuid_count does not allow that.
    
    __cpuidex is defined in cpuid.h for gcc/clang, but in intrin.h
    for MSVC, so adjust tests to suite. We also need to cast the array
    of unsigned ints to signed, since gcc (with -Wall) and clang emit
    warnings otherwise.
    
    Author: Lukas Fittl <lukas@fittl.com>
    Reviewed-by: Andres Freund <andres@anarazel.de>
    Reviewed-by: John Naylor <john.naylor@postgresql.org>
    Discussion: https://postgr.es/m/CAP53PkyooCeR8YV0BUD_xC7oTZESHz8OdA=tP7pBRHFVQ9xtKg@mail.gmail.com

[parent: bb6ae9707c17]