[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: Floating-point constant folding in Emacs byte compiler
From: |
Eli Zaretskii |
Subject: |
Re: Floating-point constant folding in Emacs byte compiler |
Date: |
Mon, 26 Mar 2018 18:13:22 +0300 |
> X-Spam-Status: No, score=-0.5 required=5.0 tests=BAYES_05,FREEMAIL_FROM,
> T_DKIM_INVALID autolearn=disabled version=3.3.2
> From: Robert Pluim <address@hidden>
> Cc: Pip Cet <address@hidden>, address@hidden, address@hidden
> Gmane-Reply-To-List: yes
> Date: Mon, 26 Mar 2018 11:39:25 +0200
>
> >> I imagine that on a 32-bit version of emacs, (byte-compile (lambda (x)
> >> (* #x10000 #x10000))) similarly produces a constant-zero function,
> >
> > The result depends on whether Emacs was build --with-wide-int. If it
> > was, the result is #[(x) "\300\207" [4294967296] 1], if it wasn't, I
> > get #[(x) "\300\207" [0] 1].
>
> Hmm, would it be worthwhile to have Emacs signal overflow in such a
> situation (perhaps controlled by a configuration variable) so we could
> fix such issues?
In which of these two cases do you see overflow?
I also don't think I understand the utility of signaling an overflow
error from the byte compiler that happened because it did constant
folding. What else except bug reports could this yield?
- Floating-point constant folding in Emacs byte compiler, Paul Eggert, 2018/03/22
- Re: Floating-point constant folding in Emacs byte compiler, Pip Cet, 2018/03/23
- Re: Floating-point constant folding in Emacs byte compiler, Eli Zaretskii, 2018/03/24
- Re: Floating-point constant folding in Emacs byte compiler, Robert Pluim, 2018/03/26
- Re: Floating-point constant folding in Emacs byte compiler,
Eli Zaretskii <=
- Re: Floating-point constant folding in Emacs byte compiler, Robert Pluim, 2018/03/26
- Re: Floating-point constant folding in Emacs byte compiler, Eli Zaretskii, 2018/03/26
- Re: Floating-point constant folding in Emacs byte compiler, Pip Cet, 2018/03/26
- Re: Floating-point constant folding in Emacs byte compiler, Eli Zaretskii, 2018/03/26
- Re: Floating-point constant folding in Emacs byte compiler, Paul Eggert, 2018/03/26
- Re: Floating-point constant folding in Emacs byte compiler, Paul Eggert, 2018/03/27
- Re: Floating-point constant folding in Emacs byte compiler, Pip Cet, 2018/03/30
- Re: Floating-point constant folding in Emacs byte compiler, Noam Postavsky, 2018/03/30
- Re: Floating-point constant folding in Emacs byte compiler, Paul Eggert, 2018/03/30
- Re: Floating-point constant folding in Emacs byte compiler, Stefan Monnier, 2018/03/26