On Wed, 8 May 2024, Richard Biener wrote:
> So it's reasonable to require -fnon-call-exceptions (which now enables
> -fexceptions) and -fno-delete-dead-exceptions to have GCC preserve
> a change of control flow side-effect of x*x? We do not preserve
> FP exception bits set by otherwise unused
On Tue, May 7, 2024 at 10:44 PM Joseph Myers wrote:
>
> On Fri, 3 May 2024, Richard Biener wrote:
>
> > So what I do not necessarily agree with is that we need to preserve
> > the multiplication with -fsignaling-nans. Do we consider a program doing
> >
> > handler() { exit(0); }
> >
> > x =
On Fri, 3 May 2024, Richard Biener wrote:
> So what I do not necessarily agree with is that we need to preserve
> the multiplication with -fsignaling-nans. Do we consider a program doing
>
> handler() { exit(0); }
>
> x = sNaN;
> ...
> sigaction(SIGFPE, ... handler)
> x*x;
>
On Thu, May 2, 2024 at 3:48 PM Roger Sayle wrote:
>
>
> > From: Richard Biener
> > On Thu, May 2, 2024 at 11:34 AM Roger Sayle
> > wrote:
> > >
> > >
> > > > From: Richard Biener On Fri, Apr 26,
> > > > 2024 at 10:19 AM Roger Sayle
> > > > wrote:
> > > > >
> > > > > This patch addresses PR
> From: Richard Biener
> On Thu, May 2, 2024 at 11:34 AM Roger Sayle
> wrote:
> >
> >
> > > From: Richard Biener On Fri, Apr 26,
> > > 2024 at 10:19 AM Roger Sayle
> > > wrote:
> > > >
> > > > This patch addresses PR middle-end/111701 where optimization of
> > > > signbit(x*x) using
On Thu, May 2, 2024 at 11:34 AM Roger Sayle wrote:
>
>
> > From: Richard Biener
> > On Fri, Apr 26, 2024 at 10:19 AM Roger Sayle
> > wrote:
> > >
> > > This patch addresses PR middle-end/111701 where optimization of
> > > signbit(x*x) using tree_nonnegative_p incorrectly eliminates a
> > >
> From: Richard Biener
> On Fri, Apr 26, 2024 at 10:19 AM Roger Sayle
> wrote:
> >
> > This patch addresses PR middle-end/111701 where optimization of
> > signbit(x*x) using tree_nonnegative_p incorrectly eliminates a
> > floating point multiplication when the operands may potentially be
On Fri, Apr 26, 2024 at 10:19 AM Roger Sayle wrote:
>
>
> This patch addresses PR middle-end/111701 where optimization of signbit(x*x)
> using tree_nonnegative_p incorrectly eliminates a floating point
> multiplication when the operands may potentially be signaling NaNs.
>
> The above bug fix
