Displaying 6 results from an estimated 6 matches for "lceil".
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2010 Nov 09
0
[LLVMdev] Phronix does another speed test
On Mon, 8 Nov 2010 15:42:33 -0800 (PST)
Samuel Crow <samuraileumas at yahoo.com> wrote:
> http://www.phoronix.com/scan.php?page=article&item=llvm_gcc_dragonegg28&num=1
> as of version 2.8, LLVM is generating slower code than the newer GCCs
> but generates the code more quickly.
>
I would be more concerned about the 'unable to compile', or 'compiled
code not
2010 Nov 08
3
[LLVMdev] Phronix does another speed test
http://www.phoronix.com/scan.php?page=article&item=llvm_gcc_dragonegg28&num=1 as
of version 2.8, LLVM is generating slower code than the newer GCCs but generates
the code more quickly.
2010 Nov 09
2
[LLVMdev] Phronix does another speed test
...e to compile', or 'compiled
> code not working correctly' issues. It would help if they filed bugs.
I analysed the dragonegg compile failures. The graphicsmagick,
imagemagick, lame and x264 failures were all failures to link,
due undefined references to builtin_lfoor and/or builtin_lceil.
Recent gcc turns calls to floor/ceil followed by a cast to long
or long long into a call to an lfloor/lceil builtin. These were
not being recognised by dragonegg, so were just being passed on
as is, resulting in the link failures. I just added support for
these builtins and now all of the above...
2017 Sep 11
0
packed ring layout proposal v3
...fine DESC_DRIVER 0x0080
>
> struct desc {
> __le64 addr;
> __le32 len;
> __le16 index;
> __le16 flags;
> };
>
> Fields:
>
> addr - physical address of a s/g entry
> len - length of an entry
> index - unique index. The low $\lceil log(N) \rceil - 1$
> bits of the index is a driver-supplied value which can have any value
> (under driver control). The high bits are reserved and should be
> set to 0.
Drivers usually have their own information ring, so I'm not sure
exposing such flexibility i...
2017 Feb 08
16
packed ring layout proposal v2
This is an update from v1 version.
Changes:
- update event suppression mechanism
- separate options for indirect and direct s/g
- lots of new features
---
Performance analysis of this is in my kvm forum 2016 presentation.
The idea is to have a r/w descriptor in a ring structure,
replacing the used and available ring, index and descriptor
buffer.
* Descriptor ring:
Guest adds descriptors with
2017 Feb 08
16
packed ring layout proposal v2
This is an update from v1 version.
Changes:
- update event suppression mechanism
- separate options for indirect and direct s/g
- lots of new features
---
Performance analysis of this is in my kvm forum 2016 presentation.
The idea is to have a r/w descriptor in a ring structure,
replacing the used and available ring, index and descriptor
buffer.
* Descriptor ring:
Guest adds descriptors with