On Sun, Apr 10, 2011 at 5:47 AM, Jim Huang <jim.hu...@linaro.org> wrote:
> On 31 March 2011 08:23, Michael Hope <michael.h...@linaro.org> wrote:
>> Thanks all for your replies. I mixed these in with a bit of Googling
>> and recorded them here:
>> https://wiki.linaro.org/MichaelHope/Sandbox/LibrariesWithNeon
>
> hi Michael,
>
> Jan Seiffert implemented a series of adler32 vectorization for zlib:
> http://blackfin.uclinux.org/git/?p=users/vapier/zlib.git;a=summary
>
> ARM NEON and ARMv6 SIMD are included. It looks great and is being
> reviewed in zlib mailing-list:
>
> http://mail.madler.net/pipermail/zlib-devel_madler.net/2011-April/date.html
Hi jserv. I had a quick play with this on one of my machines. It
looks promising but is a bit broken at the moment:
michaelh@ursa1:/scratch/michaelh/zlib$ gdb ./example
...
Starting program: /scratch/michaelh/zlib/example
zlib version 1.2.5 = 0x1250, compile flags = 0x155
uncompress(): hello, hello!
gzread(): hello, hello!
gzgets() after gzseek: hello!
inflate(): hello, hello!
Program received signal SIGSEGV, Segmentation fault.
0x00015c48 in adler32_vec (adler=2363950230, buf=0x7b000 <Address
0x7b000 out of bounds>, len=0)
at adler32_arm.c:162
162 in16 = *(const uint8x16_t *)buf;
(gdb) back
#0 0x00015c48 in adler32_vec (adler=2363950230, buf=0x7b000 <Address
0x7b000 out of bounds>, len=0)
at adler32_arm.c:162
#1 0x00016446 in adler32 (adler=2363950230, buf=0x26008
"x\001\354\320\261\r", len=20000)
at adler32.c:418
#2 0x0000b81c in read_buf (strm=0x7ebf3634, buf=0x44ba8 "",
size=25536) at deflate.c:1005
#3 0x0000be7a in fill_window (s=0x39898) at deflate.c:1380
#4 0x0000c06c in deflate_stored (s=0x39898, flush=0) at deflate.c:1484
#5 0x0000b252 in deflate (strm=0x7ebf3634, flush=0) at deflate.c:822
#6 0x0000922e in test_large_deflate (compr=0x26008
"x\001\354\320\261\r", comprLen=40000,
uncompr=0x2fc50 "hello, hello!", uncomprLen=40000) at example.c:281
#7 0x00009ca6 in main (argc=1, argv=0x7ebf37f4) at example.c:551
Richard, the implementation uses NEON intrinsics so it'd be
interesting to see if your pack/unpack patches apply to it.
I'll mention this on the zlib-devel list.
-- Michael
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