[PATCH 05/34] rs6000: Add available-everywhere and ancient builtins

will schmidt will_schmidt@vnet.ibm.com
Tue Aug 10 16:17:05 GMT 2021


On Thu, 2021-07-29 at 08:30 -0500, Bill Schmidt wrote:
> 2021-06-07  Bill Schmidt  <wschmidt@linux.ibm.com>
> 
> gcc/
> 	* config/rs6000/rs6000-builtin-new.def: Add always, power5, and
> 	power6 stanzas.
> ---
>  gcc/config/rs6000/rs6000-builtin-new.def | 72 ++++++++++++++++++++++++
>  1 file changed, 72 insertions(+)
> 
> diff --git a/gcc/config/rs6000/rs6000-builtin-new.def b/gcc/config/rs6000/rs6000-builtin-new.def
> index 974cdc8c37c..ca694be1ac3 100644
> --- a/gcc/config/rs6000/rs6000-builtin-new.def
> +++ b/gcc/config/rs6000/rs6000-builtin-new.def
> @@ -184,6 +184,78 @@
>  
>  
>  
> +; Builtins that have been around since time immemorial or are just
> +; considered available everywhere.
> +[always]
> +  void __builtin_cpu_init ();
> +    CPU_INIT nothing {cpu}
> +
> +  bool __builtin_cpu_is (string);
> +    CPU_IS nothing {cpu}
> +
> +  bool __builtin_cpu_supports (string);
> +    CPU_SUPPORTS nothing {cpu}
> +
> +  unsigned long long __builtin_ppc_get_timebase ();
> +    GET_TB rs6000_get_timebase {}
> +
> +  double __builtin_mffs ();
> +    MFFS rs6000_mffs {}
> +
> +; This will break for long double == _Float128.  libgcc history.

Add a few more words to provide bigger hints for future archeological
digs?  (This is perhaps an obvious issue, but I'd need to do some
spelunking)
I see similar comments below, maybe just a wordier comment for the
first occurance.   Unsure...  

> +  const long double __builtin_pack_longdouble (double, double);
> +    PACK_TF packtf {}
> +
> +  unsigned long __builtin_ppc_mftb ();
> +    MFTB rs6000_mftb_di {32bit}
> +
> +  void __builtin_mtfsb0 (const int<5>);
> +    MTFSB0 rs6000_mtfsb0 {}
> +
> +  void __builtin_mtfsb1 (const int<5>);
> +    MTFSB1 rs6000_mtfsb1 {}
> +
> +  void __builtin_mtfsf (const int<8>, double);
> +    MTFSF rs6000_mtfsf {}
> +
> +  const __ibm128 __builtin_pack_ibm128 (double, double);
> +    PACK_IF packif {}
> +
> +  void __builtin_set_fpscr_rn (const int[0,3]);
> +    SET_FPSCR_RN rs6000_set_fpscr_rn {}
> +
> +  const double __builtin_unpack_ibm128 (__ibm128, const int<1>);
> +    UNPACK_IF unpackif {}
> +
> +; This will break for long double == _Float128.  libgcc history.
> +  const double __builtin_unpack_longdouble (long double, const int<1>);
> +    UNPACK_TF unpacktf {}
> +
> +
> +; Builtins that have been around just about forever, but not quite.
> +[power5]
> +  fpmath double __builtin_recipdiv (double, double);
> +    RECIP recipdf3 {}
> +
> +  fpmath float __builtin_recipdivf (float, float);
> +    RECIPF recipsf3 {}
> +
> +  fpmath double __builtin_rsqrt (double);
> +    RSQRT rsqrtdf2 {}
> +
> +  fpmath float __builtin_rsqrtf (float);
> +    RSQRTF rsqrtsf2 {}
> +
> +
> +; Power6 builtins.

I see in subsequent patches you also call out the ISA version in the
comment.  so perhaps
; Power6 builtins (ISA 2.05).

Similar comment for Power5 reference
above.


> +[power6]
> +  const signed long __builtin_p6_cmpb (signed long, signed long);
> +    CMPB cmpbdi3 {}
> +
> +  const signed int __builtin_p6_cmpb_32 (signed int, signed int);
> +    CMPB_32 cmpbsi3 {}
> +
> +

ok.


>  ; AltiVec builtins.
>  [altivec]
>    const vsc __builtin_altivec_abs_v16qi (vsc);



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