On Thu, Jun 24, 2021 at 2:12 PM H.J. Lu <hjl.to...@gmail.com> wrote:
>
> CPUID functions are used to detect CPU features. If vector ISAs
> are enabled, compiler is free to use them in these functions. Add
> __attribute__ ((target("general-regs-only"))) to CPUID functions
> to avoid vector instructions.
These functions are intended to be inlined, so how does target
attribute affect inlining?
Uros.
>
> gcc/
>
> PR target/101185
> * config/i386/cpuid.h (__get_cpuid_max): Add
> __attribute__ ((target("general-regs-only"))).
> (__get_cpuid): Likewise.
> (__get_cpuid_count): Likewise.
> (__cpuidex): Likewise.
>
> gcc/testsuite/
>
> PR target/101185
> * gcc.target/i386/avx512-check.h (check_osxsave): Add
> __attribute__ ((target("general-regs-only"))).
> (main): Likewise.
> ---
> gcc/config/i386/cpuid.h | 4 ++++
> gcc/testsuite/gcc.target/i386/avx512-check.h | 2 ++
> 2 files changed, 6 insertions(+)
>
> diff --git a/gcc/config/i386/cpuid.h b/gcc/config/i386/cpuid.h
> index aebc17c6827..74881ee91e5 100644
> --- a/gcc/config/i386/cpuid.h
> +++ b/gcc/config/i386/cpuid.h
> @@ -243,6 +243,7 @@
> pointer is non-null, then first four bytes of the signature
> (as found in ebx register) are returned in location pointed by sig. */
>
> +__attribute__ ((target("general-regs-only")))
> static __inline unsigned int
> __get_cpuid_max (unsigned int __ext, unsigned int *__sig)
> {
> @@ -298,6 +299,7 @@ __get_cpuid_max (unsigned int __ext, unsigned int *__sig)
> supported and returns 1 for valid cpuid information or 0 for
> unsupported cpuid leaf. All pointers are required to be non-null. */
>
> +__attribute__ ((target("general-regs-only")))
> static __inline int
> __get_cpuid (unsigned int __leaf,
> unsigned int *__eax, unsigned int *__ebx,
> @@ -315,6 +317,7 @@ __get_cpuid (unsigned int __leaf,
>
> /* Same as above, but sub-leaf can be specified. */
>
> +__attribute__ ((target("general-regs-only")))
> static __inline int
> __get_cpuid_count (unsigned int __leaf, unsigned int __subleaf,
> unsigned int *__eax, unsigned int *__ebx,
> @@ -330,6 +333,7 @@ __get_cpuid_count (unsigned int __leaf, unsigned int
> __subleaf,
> return 1;
> }
>
> +__attribute__ ((target("general-regs-only")))
> static __inline void
> __cpuidex (int __cpuid_info[4], int __leaf, int __subleaf)
> {
> diff --git a/gcc/testsuite/gcc.target/i386/avx512-check.h
> b/gcc/testsuite/gcc.target/i386/avx512-check.h
> index 0a377dba1d5..406faf8fe03 100644
> --- a/gcc/testsuite/gcc.target/i386/avx512-check.h
> +++ b/gcc/testsuite/gcc.target/i386/avx512-check.h
> @@ -25,6 +25,7 @@ do_test (void)
> }
> #endif
>
> +__attribute__ ((target("general-regs-only")))
> static int
> check_osxsave (void)
> {
> @@ -34,6 +35,7 @@ check_osxsave (void)
> return (ecx & bit_OSXSAVE) != 0;
> }
>
> +__attribute__ ((target("general-regs-only")))
> int
> main ()
> {
> --
> 2.31.1
>
