[testsuite] Add test for PR91532

[Richard Sandiford]

Prathamesh Kulkarni <prathamesh.kulkarni@linaro.org> writes:
> Hi Richard,
> Sorry for not adding the test in PR91532 fix.
> Is the attached patch OK to commit ?
>
> Thanks,
> Prathamesh
>
> 2019-10-18  Prathamesh Kulkarni  <prathamesh.kulkarni@linaro.org>
>
> 	PR tree-optimization/91532
> testsuite/
> 	* gcc.target/aarch64/sve/fmla_2.c: Add dg-scan check for deleted store.
>
> diff --git a/gcc/testsuite/gcc.target/aarch64/sve/fmla_2.c b/gcc/testsuite/gcc.target/aarch64/sve/fmla_2.c
> index 5c04bcdb3f5..bebb073d1f8 100644
> --- a/gcc/testsuite/gcc.target/aarch64/sve/fmla_2.c
> +++ b/gcc/testsuite/gcc.target/aarch64/sve/fmla_2.c
> @@ -1,4 +1,4 @@
> -/* { dg-options "-O3" } */
> +/* { dg-options "-O3 -fdump-tree-ifcvt-details" } */
>  
>  #include <stdint.h>
>  
> @@ -15,5 +15,6 @@ f (double *restrict a, double *restrict b, double *restrict c,
>      }
>  }
>  
> +/* { dg-final { scan-tree-dump-times "Deleted dead store" 1 "ifcvt" } } */
>  /* { dg-final { scan-assembler-times {\tfmla\tz[0-9]+\.d, p[0-7]/m, z[0-9]+\.d, z[0-9]+\.d\n} 2 } } */
>  /* { dg-final { scan-assembler-not {\tfmad\t} } } */

I think it'd be better to have a scan-assembler-times for st1d instead,
so that we're testing the end result rather than how we get there.

Thanks,
Richard