RE: use -mfpu=neon for arm/simd/vmmla_1.c

[Kyrylo Tkachov <Kyrylo.Tkachov@arm.com>]

> -----Original Message-----
> From: Gcc-patches <gcc-patches-bounces@gcc.gnu.org> On Behalf Of
> Alexandre Oliva
> Sent: 05 January 2021 07:49
> To: gcc-patches@gcc.gnu.org
> Subject: use -mfpu=neon for arm/simd/vmmla_1.c
> 
> 
> On some of our arm targets, we get various -mfpu flags implicitly or
> explicitly passed to the compiler during test runs.  The target
> options pushed in arm_neon.h that affect vmmlaq_s32 set isa_bit_neon,
> but the caller doesn't have that bit set, so arm_can_inline_p rejects
> the attempt to inline it, and the test fails.
> 
> An explicit -mfpu=neon would address the compile problem, but cause
> the assembler to reject the generated code.
> 
> So this patch adds -mfpu=auto to the test, overriding any implicit
> flags with the fpu implied by the arch.
> 
> Regstrapped on x86_64-linux-gnu, also tested on x-arm-wrs-vxworks7r2.
> Ok to install?

Ok. Aren't there more tests that have this problem?
Thanks,
Kyrill

> 
> 
> for  gcc/testsuite/ChangeLog
> 
> 	* gcc.target/arm/simd/vmmla_1.c: Pass -mfpu=auto.
> ---
>  gcc/testsuite/gcc.target/arm/simd/vmmla_1.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/gcc/testsuite/gcc.target/arm/simd/vmmla_1.c
> b/gcc/testsuite/gcc.target/arm/simd/vmmla_1.c
> index aeb4a359e3351..d33ebf361d436 100644
> --- a/gcc/testsuite/gcc.target/arm/simd/vmmla_1.c
> +++ b/gcc/testsuite/gcc.target/arm/simd/vmmla_1.c
> @@ -1,6 +1,6 @@
>  /* { dg-do assemble } */
>  /* { dg-require-effective-target arm_v8_2a_i8mm_ok } */
> -/* { dg-options "-save-temps -O2 -march=armv8.2-a+i8mm -mfloat-
> abi=hard" } */
> +/* { dg-options "-save-temps -O2 -march=armv8.2-a+i8mm -mfpu=auto -
> mfloat-abi=hard" } */
> 
>  #include "arm_neon.h"
> 
> 
> --
> Alexandre Oliva, happy hacker  https://FSFLA.org/blogs/lxo/
>    Free Software Activist         GNU Toolchain Engineer
>         Vim, Vi, Voltei pro Emacs -- GNUlius Caesar