[Bug tree-optimization/18219] [4.0/4.1 Regression] gcc-4.0/4.1.0 bloats code by 31%

[Bug tree-optimization/18219] [4.0/4.1 Regression] gcc-4.0/4.1.0 bloats code by 31%

[pinskia at gcc dot gnu dot org]

-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |pinskia at gcc dot gnu dot
                   |                            |org
           Severity|normal                      |minor


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18219

[Bug tree-optimization/18219] [4.0/4.1 Regression] gcc-4.0/4.1.0 bloats code by 31%

[mmitchel at gcc dot gnu dot org]

------- Comment #16 from mmitchel at gcc dot gnu dot org  2005-10-31 01:36 -------
Leaving as P2; this seems like something we should try to fix, if possible.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18219

[Bug tree-optimization/18219] [4.0/4.1/4.2 Regression] gcc-4.0/4.1/4.2.0 bloats code by 31%

[steven at gcc dot gnu dot org]

------- Comment #17 from steven at gcc dot gnu dot org  2006-01-09 22:43 -------
And the numbers for "gcc (GCC) 4.1.0 20060109" are....

flags:                  .text size: 
-Os                     86 bytes
-Os -fno-ivopts         86 bytes
-m32 -Os                58 bytes
-m32 -Os -fno-ivopts    59 bytes


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18219

[Bug tree-optimization/18219] [4.0/4.1/4.2 Regression] gcc-4.0/4.1/4.2.0 bloats code by 31%

[steven at gcc dot gnu dot org]

------- Comment #18 from steven at gcc dot gnu dot org  2006-01-09 22:44 -------
For reference, gcc 3.3-hammer-branch has the following .text sizes:

flags:                  .text size: 
-Os                     83
-m32 -Os                44


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18219

[Bug tree-optimization/18219] [4.0/4.1/4.2 Regression] gcc-4.0/4.1/4.2.0 bloats code by 31%

[steven at gcc dot gnu dot org]

------- Comment #19 from steven at gcc dot gnu dot org  2006-01-09 22:50 -------
Disassembly of section .text for x86 (compiled on AMD64 with -m32 -mtune=i686):

00000000 <cdt>:
   0:   55                      push   %ebp
   1:   89 e5                   mov    %esp,%ebp
   3:   8b 4d 10                mov    0x10(%ebp),%ecx
   6:   56                      push   %esi
   7:   8b 75 14                mov    0x14(%ebp),%esi
   a:   53                      push   %ebx
   b:   8b 5d 08                mov    0x8(%ebp),%ebx
   e:   8d 04 8d 00 00 00 00    lea    0x0(,%ecx,4),%eax
  15:   01 c3                   add    %eax,%ebx
  17:   03 45 0c                add    0xc(%ebp),%eax
  1a:   8d 50 04                lea    0x4(%eax),%edx
  1d:   eb 0c                   jmp    2b <cdt+0x2b>
  1f:   8b 43 fc                mov    0xfffffffc(%ebx),%eax
  22:   40                      inc    %eax
  23:   01 c0                   add    %eax,%eax
  25:   2b 42 fc                sub    0xfffffffc(%edx),%eax
  28:   89 42 fc                mov    %eax,0xfffffffc(%edx)
  2b:   41                      inc    %ecx
  2c:   83 c3 04                add    $0x4,%ebx
  2f:   83 c2 04                add    $0x4,%edx
  32:   39 f1                   cmp    %esi,%ecx
  34:   7e e9                   jle    1f <cdt+0x1f>
  36:   5b                      pop    %ebx
  37:   5e                      pop    %esi
  38:   5d                      pop    %ebp
  39:   c3                      ret


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18219

[Bug tree-optimization/18219] [4.0/4.1/4.2 Regression] bloats code by 31%

[mmitchel at gcc dot gnu dot org]

------- Comment #20 from mmitchel at gcc dot gnu dot org  2006-02-24 00:25 -------
This issue will not be resolved in GCC 4.1.0; retargeted at GCC 4.1.1.


-- 

mmitchel at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.0.3                       |4.1.1


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18219

[Bug tree-optimization/18219] [4.0/4.1/4.2 Regression] bloats code by 31%

[rguenth at gcc dot gnu dot org]

------- Comment #21 from rguenth at gcc dot gnu dot org  2006-05-12 14:00 -------
This looks related to PR26726 as IVOPTs produces now

<bb 2>:
  i = minLen + 1;
  D.1588 = (int *) (unsigned int) (i * 4);
  ivtmp.34 = limit + D.1588 - 4B;
  ivtmp.40 = base + D.1588;
  goto <bb 4> (<L1>);

<L0>:;
  D.1595 = (int *) ivtmp.40;
  MEM[base: D.1595, offset: -4B] = (MEM[base: (int *) ivtmp.34, offset: -4B] +
1 << 1) - MEM[base: D.1595, offset: -4B];
  i = i + 1;

<L1>:;
  ivtmp.34 = ivtmp.34 + 4B;
  ivtmp.40 = ivtmp.40 + 4B;
  if (i <= maxLen) goto <L0>; else goto <L2>;

with the seemingly innocuous offset: -4B canonicalization because of the weird
i386 backend cost model.  Now if fixing that would fix the size issue is
another thing.  Not replacing the exit test or using i as solely IV is another
thing - but it doesn't even consider i as IV candidate.


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rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  BugsThisDependsOn|                            |26726


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18219

[Bug tree-optimization/18219] [4.0/4.1/4.2 Regression] bloats code by 31%

[mmitchel at gcc dot gnu dot org]

------- Comment #22 from mmitchel at gcc dot gnu dot org  2006-05-25 02:32 -------
Will not be fixed in 4.1.1; adjust target milestone to 4.1.2.


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mmitchel at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.1.1                       |4.1.2


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18219

[Bug tree-optimization/18219] [4.0/4.1/4.2 Regression] bloats code by 31%

[pinskia at gcc dot gnu dot org]

------- Comment #23 from pinskia at gcc dot gnu dot org  2006-08-28 05:11 -------
New results from the mainline:
options            size
-Os                 59
-Os -fno-ivopts     52
-Os -ftree-ch       58
-O2                 64


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18219

[Bug tree-optimization/18219] [4.0/4.1/4.2/4.3 Regression] bloats code by 31%

[mmitchel at gcc dot gnu dot org]

-- 

mmitchel at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.1.2                       |4.1.3


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18219

[Bug tree-optimization/18219] [4.0/4.1/4.2/4.3 Regression] bloats code by 31%

[pinskia at gcc dot gnu dot org]

------- Comment #24 from pinskia at gcc dot gnu dot org  2007-06-18 04:39 -------
  MEM[index: ivtmp.39, offset: 0x0fffffffc] = (MEM[index: ivtmp.35, offset:
0x0fffffffc] + 1 << 1) - MEM[index: ivtmp.39, offset: 0x0fffffffc];


We still get an offset of -4.


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pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|2004-10-29 14:30:12         |2007-06-18 04:39:14
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18219

[Bug tree-optimization/18219] [4.0/4.1/4.2/4.3 Regression] bloats code by 31%

[ubizjak at gmail dot com]

------- Comment #25 from ubizjak at gmail dot com  2007-06-18 10:17 -------
(In reply to comment #24)
>   MEM[index: ivtmp.39, offset: 0x0fffffffc] = (MEM[index: ivtmp.35, offset:
> 0x0fffffffc] + 1 << 1) - MEM[index: ivtmp.39, offset: 0x0fffffffc];
> 
> 
> We still get an offset of -4.

PR target/24669


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ubizjak at gmail dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  BugsThisDependsOn|                            |24669


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18219

[Bug tree-optimization/18219] [4.0/4.1/4.2/4.3 Regression] bloats code by 31%

[ubizjak at gmail dot com]

------- Comment #26 from ubizjak at gmail dot com  2007-10-29 08:29 -------
We regress a bit more with
gcc version 4.3.0 20071029 (experimental) [trunk revision 129715] (GCC) 

options          size
 -Os              60
 -Os -fno-ivopts  55
 -Os -ftree-ch    55
 -O2              59


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ubizjak at gmail dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ubizjak at gmail dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18219

[Bug tree-optimization/18219] [4.2/4.3/4.4 Regression] bloats code by 31%

[jsm28 at gcc dot gnu dot org]

------- Comment #27 from jsm28 at gcc dot gnu dot org  2008-07-04 16:34 -------
Closing 4.1 branch.


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jsm28 at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[4.1/4.2/4.3/4.4 Regression]|[4.2/4.3/4.4 Regression]
                   |bloats code by 31%          |bloats code by 31%
   Target Milestone|4.1.3                       |4.2.5


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18219

[Bug tree-optimization/18219] [4.3/4.4/4.5 Regression] bloats code by 31%

[jsm28 at gcc dot gnu dot org]

------- Comment #28 from jsm28 at gcc dot gnu dot org  2009-03-31 16:21 -------
Closing 4.2 branch.


-- 

jsm28 at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[4.2/4.3/4.4/4.5 Regression]|[4.3/4.4/4.5 Regression]
                   |bloats code by 31%          |bloats code by 31%
   Target Milestone|4.2.5                       |4.3.4


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18219

[Bug tree-optimization/18219] [4.3/4.4/4.5 Regression] bloats code by 31%

[rguenth at gcc dot gnu dot org]

------- Comment #29 from rguenth at gcc dot gnu dot org  2009-08-04 12:26 -------
GCC 4.3.4 is being released, adjusting target milestone.


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.3.4                       |4.3.5


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18219

[Bug tree-optimization/18219] [4.3/4.4 Regression] bloats code by 31%

[steven at gcc dot gnu dot org]

------- Comment #30 from steven at gcc dot gnu dot org  2010-01-03 22:57 -------
With the following compiler:
$ ./xgcc --version
xgcc (GCC) 4.5.0 20091228 (experimental) [trunk revision 155486]
Copyright (C) 2009 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.


I get the following size with -m32 for the test case of comment #0:
$ ./xgcc -B. -c t.c -m32 -Os -fno-ivopts -o tOsi.o
$ ./xgcc -B. -c t.c -m32 -Os -o tOs.o
$ size tOs*
   text    data     bss     dec     hex filename
     45       0       0      45      2d tOsi.o
     42       0       0      42      2a tOs.o
$ 


And I get the following size with -m64:
$ ./xgcc -B. -c t.c -Os -o tOs.o
$ ./xgcc -B. -c t.c -Os -fno-ivopts -o tOsi.o
$ size tOs*
   text    data     bss     dec     hex filename
     78       0       0      78      4e tOsi.o
     89       0       0      89      59 tOs.o
$ 


This is, therefore, fixed on the trunk for GCC 4.5.


-- 

steven at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to work|                            |4.5.0
            Summary|[4.3/4.4/4.5 Regression]    |[4.3/4.4 Regression] bloats
                   |bloats code by 31%          |code by 31%


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18219

[Bug tree-optimization/18219] [4.3/4.4 Regression] bloats code by 31%

[rguenth at gcc dot gnu dot org]

------- Comment #31 from rguenth at gcc dot gnu dot org  2010-01-03 23:14 -------
Heh.  I wonder how we can reliably add testcases for code size issues ...
can we either dump size estimates or extract object .text section sizes?
Ian may know arm people who I suspect would be interested in contributing
infrastructure for this.


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rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |iant at google dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18219

[Bug tree-optimization/18219] [4.3/4.4 Regression] bloats code by 31%

[rguenth at gcc dot gnu dot org]

------- Comment #32 from rguenth at gcc dot gnu dot org  2010-05-22 18:10 -------
GCC 4.3.5 is being released, adjusting target milestone.


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.3.5                       |4.3.6


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18219