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From: Hendrik Boom <hendrik@topoi.pooq.com>
To: libre-riscv-dev@lists.libre-riscv.org
Subject: Re: [libre-riscv-dev] parser precedence, code review / checking needed
Date: Fri, 3 Apr 2020 16:41:18 -0400
Message-ID: <20200403204118.mdnwdquouremxeid@topoi.pooq.com> (raw)
In-Reply-To: <CAC2bXD6FrkbjMvBWxWn=2F0cjtzHuOWJUtk2Cs_fOu1MYe8Xcw@mail.gmail.com>

On Fri, Apr 03, 2020 at 11:22:56AM -0700, Jacob Lifshay wrote:
> On Fri, Apr 3, 2020, 08:20 Luke Kenneth Casson Leighton <lkcl@lkcl.net>
> wrote:
...
> > +in_range <-  (x | y) & (a | b)
> > +in_range <-  (x + y) - (a + b)
> > +"""
> >
> 
> since there are parenthesis, precedence between &, |, +, and - doesn't
> actually matter here, so it's not a good example. Traditionally + and -
> have the same precedence whereas & has higher precedence than | so a & b |
> c parses as (a & b) | c.

Presumably because the early logicians treated 'and' as being a multiplication
and 'or' as being an addition.

-- hendrik

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Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-03 15:19 Luke Kenneth Casson Leighton
2020-04-03 18:22 ` Jacob Lifshay
2020-04-03 18:49   ` Luke Kenneth Casson Leighton
2020-04-03 20:08     ` Jacob Lifshay
2020-04-03 21:44       ` Luke Kenneth Casson Leighton
2020-04-03 20:41   ` Hendrik Boom [this message]

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