http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54710
Bug #: 54710
Summary: moderately large tuple, with many gets, ballons
compile time
Classification: Unclassified
Product: gcc
Version: 4.8.0
Status: UNCONFIRMED
Severity: enhancement
Priority: P3
Component: c++
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: cppljev...@suddenlink.net
Created attachment 28274
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=28274
zip file containing source code, make files, make output, timing output
Using a multiple inheritance tuple implementation, and with many gets
to elements of tuple, compile time ballons from:
0.5 * the compile time using clang
to:
3.4 * the compile time using clang
when tuple size is 20.
The attached include a make file (suffix .mk) and the test driver
(suffix .cpp). The time results are in the .txt files.
The time results show that as macro value LAST_LESS goes from
4 to 20, g++ compiles faster than clang, but as LAST_LESS
approaches TUPLE_SIZE, g++ slows down dramatically.
Could g++ be enhanced so that the compile times do no
increase so dramatically?
-regards,
Larry
