On Fri, Mar 11, 2022 at 12:31 AM Roger Sayle wrote:
>
>
> This patch addresses PR middle-end/98420, which is inappropriate constant
> folding of x - x to 0.0 (in match.pd) when -frounding-math is specified.
> Specifically, x - x may be -0.0 with FE_DOWNWARD as the rounding mode.
>
> To summarize,
This patch addresses PR middle-end/98420, which is inappropriate constant
folding of x - x to 0.0 (in match.pd) when -frounding-math is specified.
Specifically, x - x may be -0.0 with FE_DOWNWARD as the rounding mode.
To summarize, the desired IEEE behaviour, x - x for floating point x,
(1) can't
