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* [Bug rtl-optimization/18599] New: Quadratic behavior in copyprop_hardreg_forward
@ 2004-11-21 17:56 kazu at cs dot umass dot edu
  2004-11-21 17:56 ` [Bug rtl-optimization/18599] " kazu at cs dot umass dot edu
                   ` (7 more replies)
  0 siblings, 8 replies; 9+ messages in thread
From: kazu at cs dot umass dot edu @ 2004-11-21 17:56 UTC (permalink / raw)
  To: gcc-bugs

The following variant of PR15524 takes a lot of time in regrename.
I use -O2 -fno-gcse to make regrename stand out. 

#define CL0(a) case a: return a;
#define CL1(a) CL0(a##0) CL0(a##1) CL0(a##2) CL0(a##3) CL0(a##4) CL0(a##5) \
 CL0(a##6) CL0(a##7) CL0(a##8) CL0(a##9)
#define CL2(a) CL1(a##0) CL1(a##1) CL1(a##2) CL1(a##3) CL1(a##4) CL1(a##5) \
 CL1(a##6) CL1(a##7) CL1(a##8) CL1(a##9)
#define CL3(a) CL2(a##0) CL2(a##1) CL2(a##2) CL2(a##3) CL2(a##4) CL2(a##5) \
 CL2(a##6) CL2(a##7) CL2(a##8) CL2(a##9)
#define CL4(a) CL3(a##0) CL3(a##1) CL3(a##2) CL3(a##3) CL3(a##4) CL3(a##5) \
 CL3(a##6) CL3(a##7) CL3(a##8) CL3(a##9)

void f();

int
a (int b)
{
  switch (b)
   {
     CL4(1)
   }
}

-- 
           Summary: Quadratic behavior in copyprop_hardreg_forward
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Keywords: compile-time-hog
          Severity: normal
          Priority: P2
         Component: rtl-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: kazu at cs dot umass dot edu
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18599


^ permalink raw reply	[flat|nested] 9+ messages in thread
end of thread, other threads:[~2005-06-26 11:05 UTC | newest]

Thread overview: 9+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2004-11-21 17:56 [Bug rtl-optimization/18599] New: Quadratic behavior in copyprop_hardreg_forward kazu at cs dot umass dot edu
2004-11-21 17:56 ` [Bug rtl-optimization/18599] " kazu at cs dot umass dot edu
2004-11-21 17:58 ` kazu at cs dot umass dot edu
2004-11-21 23:22 ` kazu at cs dot umass dot edu
2004-11-21 23:27 ` kazu at cs dot umass dot edu
2004-11-22 15:19 ` cvs-commit at gcc dot gnu dot org
2004-11-22 15:20 ` kazu at cs dot umass dot edu
2004-12-01  0:39 ` pinskia at gcc dot gnu dot org
2005-06-26 11:05 ` steven at gcc dot gnu dot org

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