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From: "kazu at cs dot umass dot edu" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug rtl-optimization/18599] New: Quadratic behavior in copyprop_hardreg_forward Date: Sun, 21 Nov 2004 17:56:00 -0000 [thread overview] Message-ID: <20041121175613.18599.kazu@cs.umass.edu> (raw) 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
next reply other threads:[~2004-11-21 17:56 UTC|newest] Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top 2004-11-21 17:56 kazu at cs dot umass dot edu [this message] 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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