This is the mail archive of the
gcc-bugs@gcc.gnu.org
mailing list for the GCC project.
[Bug rtl-optimization/18599] New: Quadratic behavior in copyprop_hardreg_forward
- From: "kazu at cs dot umass dot edu" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 21 Nov 2004 17:56:16 -0000
- Subject: [Bug rtl-optimization/18599] New: Quadratic behavior in copyprop_hardreg_forward
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
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