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From: Wilco Dijkstra <Wilco.Dijkstra@arm.com>
To: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Cc: 'GNU C Library' <libc-alpha@sourceware.org>
Subject: Re: [PATCH] arm: Support gcc older than 10 for find_zero_all
Date: Wed, 22 Feb 2023 16:37:10 +0000	[thread overview]
Message-ID: <PAWPR08MB8982FDC6B7085F7D165D885283AA9@PAWPR08MB8982.eurprd08.prod.outlook.com> (raw)

Hi Adhemerval,

> __builtin_arm_uqsub8 is only available on gcc newer or equal than 10.

> +#if __GNUC_PREREQ (10, 0)
>   return __builtin_arm_uqsub8 (ones, x);
> +#else
> +  op_t ret;
> +  asm ("uqsub8 %0,%1,%2" : "=r"(ret) : "r"(ones), "r"(x));
> +  return ret;
> +#endif

__builtin_arm_uqsub8 is an internal builtin function which might change -
the correct way is to include "arm_acle.h" and use __uqsub8 (). Since LLVM
doesn't seem to support this, it may be easier to only keep the inline assembler
for now.

Cheers,
Wilco

             reply	other threads:[~2023-02-22 16:37 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-02-22 16:37 Wilco Dijkstra [this message]
  -- strict thread matches above, loose matches on Subject: below --
2023-02-20 16:48 Adhemerval Zanella
2023-02-20 19:26 ` Richard Henderson

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