From: Peter Maydell <email@example.com>
To: Chen Gang <firstname.lastname@example.org>
Cc: Chris Metcalf <email@example.com>,
Richard Henderson <firstname.lastname@example.org>
Subject: Re: [Qemu-devel] [PATCH 1/4] target-tilegx: Add fpu header file
Date: Thu, 12 Nov 2015 16:10:04 +0000 [thread overview]
Message-ID: <CAFEAcA9OVTCupHNjHCokcm6Teo+RNq7MTCC2DREEMFHWwai5hA@mail.gmail.com> (raw)
On 12 November 2015 at 16:04, Chen Gang <email@example.com> wrote:
> On 11/12/15 22:34, Richard Henderson wrote:
>> On 11/08/2015 06:43 AM, Chen Gang wrote:
>>> +#if !defined(HOST_WORDS_BIGENDIAN)
>>> + /* According to float(uns)sisf2 and float(uns)sidf2 in gcc tilegx.md */
>>> + uint64_t exp : 8; /* exp, 0x9e: 31 + TILEGX_F_EXP_FZERO */
>>> + uint64_t uiknown0 : 2; /* unknown */
>> I would really rather you didn't use bitfields, because of exactly this sort of endianness problem. Because, really, you can't trust this layout. But I won't press this point, because it is complicated enough already.
> Because of endianess issues, for me, I don't like bit fields either. But
> I can not find any other simpler ways than current.
> OK, I shall remove them.
>>> +#pragma pack(pop)
>> Huh? What are you attempting to do here?
> It is for matching "#pragma pack(push, 1)" which is above all related
> struct/unions in this header file.
Please don't use 'pragma pack' or bitfields. If you need to pack
and unpack things from a target-CPU defined field use bit operations
next prev parent reply other threads:[~2015-11-12 16:10 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-08 5:42 [Qemu-devel] [PATCH 0/4] Implment fpu floating point instructions Chen Gang
2015-11-08 5:43 ` [Qemu-devel] [PATCH 1/4] target-tilegx: Add fpu header file Chen Gang
2015-11-12 14:34 ` Richard Henderson
2015-11-12 16:04 ` Chen Gang
2015-11-12 16:10 ` Peter Maydell [this message]
2015-11-12 16:28 ` Chen Gang
2015-11-08 5:44 ` [Qemu-devel] [PATCH 2/4] target-tilegx: Implement fpu single floating point Chen Gang
2015-11-12 14:36 ` Richard Henderson
2015-11-12 16:12 ` Chen Gang
2015-11-12 16:18 ` Richard Henderson
2015-11-12 16:29 ` Chen Gang
2015-11-08 5:46 ` [Qemu-devel] [PATCH 3/4] target-tilegx: Implement fpu fdouble " Chen Gang
2015-11-08 5:47 ` [Qemu-devel] [PATCH 4/4] target-tilegx: Let fpu implementation code can be built and used Chen Gang
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