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Date: Fri, 20 Nov 2020 19:01:44 +0100
From: Szabolcs Nagy <nsz@...t70.net>
To: Jinliang Li <jinliang.li@...ux.alibaba.com>
Cc: musl@...ts.openwall.com
Subject: Re: [PATCH] Fix build error for vabs.f64 and vsqrt.f64
* Jinliang Li <jinliang.li@...ux.alibaba.com> [2020-11-20 18:45:03 +0800]:
> To fix the build error "Error: selected fpu does not support instruction vabs.f64 or vsqrt.f64",
> when single precision fpu, e.g. -mfpu=fpv5-sp-d16 is selected.
>
> Check if double precision fpu is supported for vabs.f64 and vsqrt.f64.
yes i think this patch should work:
both vfp and softfp call abi should work with single prec fpu.
the fp register state and load/store instructions should be
compatible between double prec and single prec only fpu so
setjmp/longjmp/fenv asm should work too.
so it is enough to fix up math asm to support single prec only fpu.
> ---
> src/math/arm/fabs.c | 2 +-
> src/math/arm/sqrt.c | 2 +-
> 2 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/src/math/arm/fabs.c b/src/math/arm/fabs.c
> index f890520a..6e1d367d 100644
> --- a/src/math/arm/fabs.c
> +++ b/src/math/arm/fabs.c
> @@ -1,6 +1,6 @@
> #include <math.h>
>
> -#if __ARM_PCS_VFP
> +#if __ARM_PCS_VFP && __ARM_FP&8
>
> double fabs(double x)
> {
> diff --git a/src/math/arm/sqrt.c b/src/math/arm/sqrt.c
> index 874af960..567e2e91 100644
> --- a/src/math/arm/sqrt.c
> +++ b/src/math/arm/sqrt.c
> @@ -1,6 +1,6 @@
> #include <math.h>
>
> -#if __ARM_PCS_VFP || (__VFP_FP__ && !__SOFTFP__)
> +#if (__ARM_PCS_VFP || (__VFP_FP__ && !__SOFTFP__)) && (__ARM_FP&8)
>
> double sqrt(double x)
> {
> --
> 2.28.0
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