This is the mail archive of the gcc@gcc.gnu.org mailing list for the GCC project.

Index Nav:	[Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav:	[Date Prev] [Date Next]	[Thread Prev] [Thread Next]
Other format:	[Raw text]

Re: logical error with 16bit arithmatic operations

From: daniel tian <daniel dot xntian at gmail dot com>
To: Ian Lance Taylor <iant at google dot com>
Cc: gcc at gcc dot gnu dot org, uday at cse dot iitb dot ac dot in, yxun lan <dennis dot yxun at gmail dot com>
Date: Tue, 31 Mar 2009 14:13:14 +0800
Subject: Re: logical error with 16bit arithmatic operations
References: <121fadb80903270212p5ab2c977t86778eed45b94d23@mail.gmail.com> <m363hvyrch.fsf@google.com> <121fadb80903302052p3d97d3edo99f51dba421324f4@mail.gmail.com> <m3k566l2ai.fsf@google.com>

Yes. You are right. I fixed the problem.
I checked the macro in INTERNAL docment,  and I copied the mips
definition of PROMOTE_MODE:

#define PROMOTE_MODE(MODE, UNSIGNEDP, TYPE)	\
  if (GET_MODE_CLASS (MODE) == MODE_INT		\
      && GET_MODE_SIZE (MODE) < UNITS_PER_WORD) \
    {                                           \
           (MODE) = Pmode;                           \
    }
Now it runs ok now.

Thank you very much.
Best regards!


2009/3/31 Ian Lance Taylor <iant@google.com>:
> daniel tian <daniel.xntian@gmail.com> writes:
>
>> But the question is how I make the gcc know to extend every smaller
>> mode to SImode. Now I check the MIPS port, maybe I can find some clue.
>
> Maybe PROMOTE_MODE.
>
> Ian
>

References:
- logical error with 16bit arithmatic operations
  - From: daniel tian
- Re: logical error with 16bit arithmatic operations
  - From: Ian Lance Taylor
- Re: logical error with 16bit arithmatic operations
  - From: daniel tian
- Re: logical error with 16bit arithmatic operations
  - From: Ian Lance Taylor

Index Nav:	[Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav:	[Date Prev] [Date Next]	[Thread Prev] [Thread Next]