From: erik quanstrom <quanstro@labs.coraid.com>
To: 9fans@9fans.net
Subject: Re: [9fans] BUG!!! in Plan9 compiler!
Date: Fri, 23 Apr 2010 18:34:56 -0400 [thread overview]
Message-ID: <5a6d0c09e489554087dcb101dd96e727@coraid.com> (raw)
In-Reply-To: <y2y13426df11004231346q415d2c3cy7c760325968d92c4@mail.gmail.com>
> On Fri, Apr 23, 2010 at 1:08 PM, Bakul Shah <bakul+plan9@bitblocks.com> wrote:
>
> >
> > If so, I consider it a bug; particularly as there is no
> > overflow involved anywhere.
> >
> >
>
> r1 2147482110 r2 -1537
on arm the difference is interesting. the first
/ is translated:
main+0x20 0x00001040 MOVW (R4>>1),R4
and the second:
main+0x34 0x00001054 ADD.MI $#0x1,R2,R2
main+0x38 0x00001058 MOVW (R2->1),R2
(5c -S has it SRL and SRA, respectively.)
if we are unsigned preserving, wouldn't this make sense, since
(x + y + z) is an unsigned expression but (x + y) is not.
- erik
next prev parent reply other threads:[~2010-04-23 22:34 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-22 15:29 tlaronde
2010-04-22 17:03 ` Bakul Shah
2010-04-22 17:36 ` tlaronde
2010-04-22 17:50 ` tlaronde
2010-04-22 19:08 ` geoff
2010-04-22 19:32 ` tlaronde
2010-04-22 20:07 ` Bakul Shah
2010-04-22 21:15 ` tlaronde
2010-04-22 21:26 ` tlaronde
2010-04-22 22:49 ` Bakul Shah
2010-04-23 7:42 ` tlaronde
2010-04-23 18:53 ` C H Forsyth
2010-04-23 18:51 ` tlaronde
2010-04-23 20:08 ` Bakul Shah
2010-04-23 20:46 ` ron minnich
2010-04-23 21:44 ` erik quanstrom
2010-04-23 22:34 ` erik quanstrom [this message]
2010-04-24 18:59 ` Bakul Shah
2010-04-24 21:47 ` Charles Forsyth
2010-04-25 0:31 ` erik quanstrom
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