[Bug optimization/13479] New: [3.4 regression] 20-30% compile-time regression with template-heavy code

[Bug optimization/13479] New: [3.4 regression] 20-30% compile-time regression with template-heavy code

[giovannibajo at libero dot it]

I attacched three preprocessed files for 3.2, 3.3 and 3.4. Compile times on my 
machine are as follows

        3.2    3.3    3.4

-O0     16.0s  14.9s  17.5s  +17%
-O1     20.7s  19.5s  23.2s  +18%
-O2     25.0s  23.6s  32.2s  +36%
-O3     27.3s  27.5s  34.2s  +24%

I am using 3.2.2, 3.3.1, 3.4 CVS 20031203.
This is better than PR8361, but still a big regression. I didn't test tree-ssa.

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           Summary: [3.4 regression] 20-30% compile-time regression with
                    template-heavy code
           Product: gcc
           Version: 3.4.0
            Status: UNCONFIRMED
          Keywords: compile-time-hog
          Severity: normal
          Priority: P2
         Component: optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: giovannibajo at libero dot it
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13479

[Bug optimization/13479] [3.4 regression] 20-30% compile-time regression with template-heavy code

[giovannibajo at libero dot it]

------- Additional Comments From giovannibajo at libero dot it  2003-12-23 14:53 -------
Created an attachment (id=5361)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=5361&action=view)
Preprocessed source for G++ 3.2


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13479

[Bug optimization/13479] [3.4 regression] 20-30% compile-time regression with template-heavy code

[giovannibajo at libero dot it]

------- Additional Comments From giovannibajo at libero dot it  2003-12-23 14:53 -------
Created an attachment (id=5362)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=5362&action=view)
Preprocessed source for G++ 3.3


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13479

[Bug optimization/13479] [3.4 regression] 20-30% compile-time regression with template-heavy code

[giovannibajo at libero dot it]

------- Additional Comments From giovannibajo at libero dot it  2003-12-23 14:54 -------
Created an attachment (id=5363)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=5363&action=view)
Preprocessed source for G++ 3.4


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13479

[Bug optimization/13479] [3.4 regression] 20-30% compile-time regression with template-heavy code

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2003-12-23 18:14 -------
Steven B. says this is most likely the same (real) issue of 8361.
You tested with checking disabled, right?

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
OtherBugsDependingO|                            |8361
              nThis|                            |
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|                            |1
   Last reconfirmed|0000-00-00 00:00:00         |2003-12-23 18:15:00
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13479

[Bug optimization/13479] [3.4 regression] 20-30% compile-time regression with template-heavy code

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2003-12-23 18:17 -------
What target are you on also.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |3.4.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13479

[Bug optimization/13479] [3.4 regression] 20-30% compile-time regression with template-heavy code

[steven at gcc dot gnu dot org]

[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
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------- Additional Comments From steven at gcc dot gnu dot org  2003-12-27 16:45 -------
Seems to be related to templates.  Test case: 
 
template<class type> 
class foo { 
  private: 
    int size; 
    type *a; 
 
  public: 
    foo<type> (int max) { 
      size = max; 
      a = new type[size]; 
    } 
 
    type& foo<type>::operator[] (int index) { 
      if (index > size) 
        index = size; 
      return a[index]; 
    } 
}; 
 
int test (void) 
{ 
  foo<int> bar(2); 
  bar[1] = 1; 
} 
 
gives, 
CPROP of ~PtO^HØ , pass 1: 2304 bytes needed, 0 const props, 0 copy props 
BYPASS of ~PtO^HØ : 3 basic blocks, 2304 bytes 
etc. 
 

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13479

[Bug optimization/13479] [3.4 regression] 20-30% compile-time regression with template-heavy code

[steven at gcc dot gnu dot org]

------- Additional Comments From steven at gcc dot gnu dot org  2003-12-27 17:09 -------
Ignore my last comment, it has ended up in the wrong PR by accident :-/ 

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13479

[Bug optimization/13479] [3.4 regression] 20-30% compile-time regression with template-heavy code

[giovannibajo at libero dot it]

------- Additional Comments From giovannibajo at libero dot it  2004-01-02 02:31 -------
Looks like checking was on :(
Sorry everyone.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |INVALID


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13479

[Bug optimization/13479] [3.4 regression] 20-30% compile-time regression with template-heavy code

[giovannibajo at libero dot it]

------- Additional Comments From giovannibajo at libero dot it  2004-01-02 02:32 -------
Maybe someone wants to try this on tree-ssa. It's smaller than 8361, so if it 
shows the same regression there, it might be useful.

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13479