From: Stephen Rothwell <sfr@canb.auug.org.au>
To: Michael Neuling <mikey@neuling.org>
Cc: linuxppc-dev@ozlabs.org, David Woodhouse <dwmw2@infradead.org>,
viro@zeniv.linux.org.uk
Subject: Re: [PATCH] powerpc: provide __bswapdi2
Date: Tue, 14 May 2013 11:09:24 +1000 [thread overview]
Message-ID: <20130514110924.091b7177d22d69e19478a134@canb.auug.org.au> (raw)
In-Reply-To: <9813.1368428999@ale.ozlabs.ibm.com>
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Hi Mikey,
On Mon, 13 May 2013 17:09:59 +1000 Michael Neuling <mikey@neuling.org> wrote:
>
> This doesn't work for me but the below does:
>
> _GLOBAL(__bswapdi2)
> rotlwi r9,r4,8
> rotlwi r10,r3,8
> rlwimi r9,r4,24,0,7
> rlwimi r10,r3,24,0,7
> rlwimi r9,r4,24,16,23
> rlwimi r10,r3,24,16,23
> mr r4,r10
> mr r3,r9
> blr
>
> stolen from GCC -02 output of:
> unsigned long long __bswapdi2(unsigned long long x)
> {
> return ((x & 0x00000000000000ffULL) << 56) |
> ((x & 0x000000000000ff00ULL) << 40) |
> ((x & 0x0000000000ff0000ULL) << 24) |
> ((x & 0x00000000ff000000ULL) << 8) |
> ((x & 0x000000ff00000000ULL) >> 8) |
> ((x & 0x0000ff0000000000ULL) >> 24) |
> ((x & 0x00ff000000000000ULL) >> 40) |
> ((x & 0xff00000000000000ULL) >> 56);
> }
So, if we are just stealing the output of gcc, why not just use the C
version (at least for 32 bit)?
--
Cheers,
Stephen Rothwell sfr@canb.auug.org.au
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next prev parent reply other threads:[~2013-05-14 1:09 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-10 21:18 [PATCH] powerpc: provide __bswapdi2 David Woodhouse
2013-05-13 6:48 ` Anton Blanchard
2013-05-13 7:20 ` Alan Modra
2013-05-13 10:27 ` David Woodhouse
2013-05-13 16:47 ` Segher Boessenkool
2013-05-13 7:09 ` Michael Neuling
2013-05-13 7:20 ` [PATCH v2] " Michael Neuling
2013-05-13 7:33 ` [PATCH] " Gabriel Paubert
2013-05-13 10:23 ` [PATCH v3] " Michael Neuling
2013-05-13 10:33 ` [PATCH] " David Woodhouse
2013-05-13 10:38 ` David Woodhouse
2013-05-13 10:51 ` Joakim Tjernlund
2013-05-13 11:12 ` Joakim Tjernlund
2013-05-13 13:12 ` Gabriel Paubert
2013-05-13 16:55 ` Segher Boessenkool
2013-05-14 1:09 ` Stephen Rothwell [this message]
2013-05-14 1:25 ` Michael Neuling
2013-05-14 6:59 ` David Woodhouse
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