Re: [PATCH v5 11/14] Hexagon (target/hexagon) Change subtract from zero to change sign

[Anton Johansson]

On 1/31/23 23:56, Taylor Simpson wrote:
> The F2_sffms instruction [r0 -= sfmpy(r1, r2)] doesn't properly
> handle -0.  Previously we would negate the input operand by subtracting
> from zero.  Instead, we negate by changing the sign bit.
>
> Test case added to tests/tcg/hexagon/fpstuff.c
>
> Signed-off-by: Taylor Simpson <tsimpson@quicinc.com>
> ---
>   target/hexagon/op_helper.c  |  2 +-
>   tests/tcg/hexagon/fpstuff.c | 31 ++++++++++++++++++++++++++++++-
>   2 files changed, 31 insertions(+), 2 deletions(-)
Reviewed-by: Anton Johansson <anjo@rev.ng>