[Bug c/40454] New: GCC 4.4.0 vs 3.4.0 - PNGCrush is about 20% slower when compiled with GCC 4.4.0

[Bug c/40454] New: GCC 4.4.0 vs 3.4.0 - PNGCrush is about 20% slower when compiled with GCC 4.4.0

[ami_stuff at o2 dot pl]

Hi,

I notice that PNGCrush compiled with GCC 4.4.0 (release) is about 20% slower
compared to GCC 3.4.0 build. (Amiga 68060@50MHz). 

CFLAGS = -I. -DNO_FSEEKO -O2 -fomit-frame-pointer -Wall -m68060 -s


PNGCrush test.png out.png


Here are the results:

GCC 3.4.0 build:

CPU time used = 267.340 seconds (decoding 16.940,
encoding 247.800, other 2.600 seconds)

GCC 4.4.0 build:

CPU time used = 328.360 seconds (decoding 16.800,
encoding 309.260, other 2.300 seconds) 


Maybe someone with m68k Debian/PPC/x86 can compile PNGCrush with GCC 3.4.0 and
GCC 4.4.0, so we will know if this regression happens there too?


Here is a link to the source code (I used PNGCrush 1.6.15 for test):

http://sourceforge.net/project/showfiles.php?group_id=1689&package_id=1641


Here is a link to PNG image:

http://www.filejumbo.com/Download/D8F7981723E5F07C/


Regards


-- 
           Summary: GCC 4.4.0 vs 3.4.0 - PNGCrush is about 20% slower when
                    compiled with GCC 4.4.0
           Product: gcc
           Version: 4.4.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: ami_stuff at o2 dot pl
  GCC host triplet: i686-cygwin
GCC target triplet: m68k-amigaos


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40454

[Bug c/40454] GCC 4.4.0 vs 3.4.0 - PNGCrush is about 20% slower when compiled with GCC 4.4.0

[ami_stuff at o2 dot pl]

------- Comment #1 from ami_stuff at o2 dot pl  2009-06-18 11:27 -------
Anyone can try to reproduce this bug on his system?


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40454

[Bug c/40454] GCC 4.4.0 vs 3.4.0 - PNGCrush is about 20% slower when compiled with GCC 4.4.0

[ami_stuff at o2 dot pl]

------- Comment #2 from ami_stuff at o2 dot pl  2009-08-12 12:09 -------
The same problem happens with GCC 4.4.1.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40454

[Bug c/40454] GCC 4.4.0 vs 3.4.0 - PNGCrush is about 20% slower when compiled with GCC 4.4.0

[ami_stuff at o2 dot pl]

------- Comment #3 from ami_stuff at o2 dot pl  2009-08-16 01:28 -------
This slowdown is because of libz. When I use minigzip from libz package to
compress data, I get the same slowdown with GCC 4.4.1. Maybe someone will try
to fix it?


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40454

[Bug c/40454] GCC 4.4.0 vs 3.4.0 - PNGCrush is about 20% slower when compiled with GCC 4.4.0

[ami_stuff at o2 dot pl]

------- Comment #4 from ami_stuff at o2 dot pl  2009-08-16 14:02 -------
The problematic source code is deflate.c from libz.

CFLAGS=-O3 -DUSE_MMAP -m68060 -fomit-frame-pointer

When I compile all source code with GCC 4.4.1, I get slow minigzip binary.

When I compile all source code with GCC 4.4.1 except deflate.c (this one I
compile with GCC 3.4.0), I get minigzip binary with normal speed.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40454

[Bug c/40454] GCC 4.4.0 vs 3.4.0 - PNGCrush is about 20% slower when compiled with GCC 4.4.0

[bonzini at gnu dot org]

------- Comment #5 from bonzini at gnu dot org  2009-08-17 08:42 -------
Can you check if the same preprocessed source for deflate.c (the deflate.i file
obtained with --save-temps) compiles fine with both 3.4.0 and 4.4.1?  If so,
please attach it together with the deflate.s files produced by the two
compilers (also obtained with --save-temps).

Thanks.


-- 

bonzini at gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bonzini at gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40454

[Bug c/40454] GCC 4.4.0 vs 3.4.0 - PNGCrush is about 20% slower when compiled with GCC 4.4.0

[ami_stuff at o2 dot pl]

------- Comment #7 from ami_stuff at o2 dot pl  2009-08-17 09:21 -------
Created an attachment (id=18378)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=18378&action=view)
preprocessed file from GCC 4.4.1 (compiles with GCC 3.4.0)


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40454

[Bug c/40454] GCC 4.4.0 vs 3.4.0 - PNGCrush is about 20% slower when compiled with GCC 4.4.0

[ami_stuff at o2 dot pl]

------- Comment #6 from ami_stuff at o2 dot pl  2009-08-17 09:21 -------
Created an attachment (id=18377)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=18377&action=view)
preprocessed file from GCC 3.4.0 (compiles with GCC 4.4.1)


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40454

[Bug c/40454] GCC 4.4.0 vs 3.4.0 - PNGCrush is about 20% slower when compiled with GCC 4.4.0

[ami_stuff at o2 dot pl]

------- Comment #8 from ami_stuff at o2 dot pl  2009-08-17 09:22 -------
Created an attachment (id=18379)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=18379&action=view)
Assembler output from GCC 3.4.0


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40454

[Bug c/40454] GCC 4.4.0 vs 3.4.0 - PNGCrush is about 20% slower when compiled with GCC 4.4.0

[ami_stuff at o2 dot pl]

------- Comment #9 from ami_stuff at o2 dot pl  2009-08-17 09:23 -------
Created an attachment (id=18380)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=18380&action=view)
assembler output from GCC 4.4.1


-- 

ami_stuff at o2 dot pl changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #18379|0                           |1
        is obsolete|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40454

[Bug c/40454] GCC 4.4.0 vs 3.4.0 - PNGCrush is about 20% slower when compiled with GCC 4.4.0

[ami_stuff at o2 dot pl]

------- Comment #10 from ami_stuff at o2 dot pl  2009-08-17 09:23 -------
Created an attachment (id=18381)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=18381&action=view)
assembler output from GCC 3.4.0


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40454

[Bug c/40454] GCC 4.4.0 vs 3.4.0 - PNGCrush is about 20% slower when compiled with GCC 4.4.0

[ami_stuff at o2 dot pl]

------- Comment #11 from ami_stuff at o2 dot pl  2009-08-17 09:26 -------
Preprocessed files compiles with GCC 3.4.0 and GCC 4.4.1. I added them as an
attachments plus asm output.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40454

[Bug c/40454] GCC 4.4.0 vs 3.4.0 - at -O3, PNGCrush is about 20% slower when compiled with GCC 4.4.0

[bonzini at gnu dot org]

------- Comment #12 from bonzini at gnu dot org  2009-08-17 13:30 -------
Please try again with GCC 4.4.1 -O2 vs. GCC 3.4.0 -O2 or -O3.


-- 

bonzini at gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|GCC 4.4.0 vs 3.4.0 -        |GCC 4.4.0 vs 3.4.0 - at -O3,
                   |PNGCrush is about 20% slower|PNGCrush is about 20% slower
                   |when compiled with GCC 4.4.0|when compiled with GCC 4.4.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40454

[Bug c/40454] GCC 4.4.0 vs 3.4.0 - at -O3, PNGCrush is about 20% slower when compiled with GCC 4.4.0

[ami_stuff at o2 dot pl]

------- Comment #13 from ami_stuff at o2 dot pl  2009-08-17 15:17 -------
Here are the results from 68060@50MHz:

minigzip_340_O1 testa.tif - 34s
minigzip_340_O2 testa.tif - 31s
minigzip_340_O3 testa.tif - 31s

minigzip_441_O1 testa.tif - 40s
minigzip_441_O2 testa.tif - 38s
minigzip_441_O3 testa.tif - 42s


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40454

[Bug target/40454] [4.4 regression] zlib is about 20% slower when compiled with GCC 4.4.1

[bonzini at gnu dot org]

------- Comment #14 from bonzini at gnu dot org  2009-09-03 07:27 -------
Can you also try with 4.5?


-- 

bonzini at gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1
   Last reconfirmed|0000-00-00 00:00:00         |2009-09-03 07:27:02
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40454

[Bug target/40454] [4.4 regression] zlib is about 20% slower when compiled with GCC 4.4.1

[ami_stuff at o2 dot pl]

------- Comment #15 from ami_stuff at o2 dot pl  2009-09-07 19:22 -------
GCC 4.4.2 - GCC 4.4.2 (20090825).
GCC 4.5.0 - GCC 4.5.0 (20090827).

Here are the results:

cputime minigzip_340_O1 testa.tif - 33.917
cputime minigzip_340_O2 testa.tif - 30.868
cputime minigzip_340_O3 testa.tif - 31.304

cputime minigzip_442_O1 testa.tif - 39.261
cputime minigzip_442_O2 testa.tif - 37.704
cputime minigzip_442_O3 testa.tif - 41.666

cputime minigzip_450_O1 testa.tif - 41.128
cputime minigzip_450_O2 testa.tif - 37.587
cputime minigzip_450_O3 testa.tif - 37.663


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40454

[Bug target/40454] [4.4 regression] zlib is about 20% slower when compiled with GCC 4.4.1

[ami_stuff at o2 dot pl]

------- Comment #16 from ami_stuff at o2 dot pl  2009-09-10 12:58 -------
cputime minigzip_412_O1 testa.tif - 34.336
cputime minigzip_412_O2 testa.tif - 34.499
cputime minigzip_412_O3 testa.tif - 34.257

cputime minigzip_425_O1 testa.tif - 36.474
cputime minigzip_425_O2 testa.tif - 35.650
cputime minigzip_425_O3 testa.tif - 35.912

cputime minigzip_432_O1 testa.tif - 39.166
cputime minigzip_432_O2 testa.tif - 35.005
cputime minigzip_432_O3 testa.tif - 38.114


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40454

[Bug target/40454] [4.4 regression] zlib is about 20% slower when compiled with GCC 4.4.1

[rguenth at gcc dot gnu dot org]

-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |missed-optimization
           Priority|P3                          |P4
   Target Milestone|---                         |4.4.2


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40454

[Bug target/40454] [4.4 regression] zlib is about 20% slower when compiled with GCC 4.4.1

[jakub at gcc dot gnu dot org]

-- 

jakub at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.4.2                       |4.4.3


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40454

[Bug target/40454] [4.4 regression] zlib is about 20% slower when compiled with GCC 4.4.1

[jakub at gcc dot gnu dot org]

-- 

jakub at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.4.3                       |4.4.4


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40454

[Bug target/40454] [4.4 regression] zlib is about 20% slower when compiled with GCC 4.4.1

[jakub at gcc dot gnu dot org]

-- 

jakub at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.4.4                       |4.4.5


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40454