[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:
optionssize
-Os 59
-Os -fno-ivopts 52
-Os -ftree-ch   58
-O2 64


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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 #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.


-- 

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%

[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.


-- 

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 #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