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Date: Tue, 27 Feb 2018 16:37:15 -0800
From: Andre McCurdy <armccurdy@...il.com>
To: musl@...ts.openwall.com
Subject: Re: clz instruction is unavailable for Thumb1

On Tue, Feb 27, 2018 at 4:03 PM, Zhao, Weiming <weimingz@...eaurora.org> wrote:
> In arch/arm/atomic_arch.h, it checks for __ARM_ARCH >= 5, which is not
> sufficient.
>
> for example, for armv6-m, it only support Thumb1, which doesn't include clz.
>
> Suggest to check if it's building for thumb1:

Musl does not currently support Thumb 1.

> diff --git a/arch/arm/atomic_arch.h b/arch/arm/atomic_arch.h
> index c5c56f8..e3cb66a 100644
> --- a/arch/arm/atomic_arch.h
> +++ b/arch/arm/atomic_arch.h
> @@ -82,7 +82,7 @@ static inline void a_crash()
>                 : : : "memory");
>  }
>
> -#if __ARM_ARCH >= 5
> +#if __ARM_ARCH >= 5 && !(defined(__thumb__) && !defined(__thumb2))
>
>
>
> --
> Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by
> The Linux Foundation
>

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