[PATCH 1/5] Consolidate reduce_and_compute code

[Joseph Myers]

On Tue, 23 Aug 2016, Siddhesh Poyarekar wrote:

> +    case 2:
> +      a = -a;
> +      da = -da;
> +    case 0:

OK with a comment on this fallthrough (we might want to use the 
-Wimplicit-fallthrough being proposed for GCC 7...).

-- 
Joseph S. Myers
joseph@codesourcery.com