We observe that on ia64,
gcc -On -c test.ii (n = 1,2,3)
is several times slower under gcc 4.1.0 than gcc 3.4.3:
Compile time in seconds
-O0 -O1 -O2 -O3
3.4.3 5.659 9.515 13.811 14.779
4.1.0 8.417 44.652 56.176 60.204
This is typical of what we observe for compiles of long files.
Hardware: IA-64 (Itanium 2), 1600 MHz, running Linux 2.6.12.2n.
% gcc -v
Reading specs from /util/bin/../lib/gcc/ia64-unknown-linux-gnu/3.4.3/specs
Configured with: ../gcc-3.4.3/configure --prefix=/mnt/util/ia64
Thread model: posix
gcc version 3.4.3
% gcc -v
Using built-in specs.
Target: ia64-unknown-linux-gnu
Configured with: ../configure --prefix=/wga1/gcc
Thread model: posix
gcc version 4.1.0 20050730 (experimental)
--
Summary: case where gcc 4.1.0 -O3 compile takes 4 times longer
than gcc 3.4.3, on ia64
Product: gcc
Version: 4.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: c++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: jaffe at broad dot mit dot edu
CC: gcc-bugs at gcc dot gnu dot org
GCC build triplet: ia64-unknown-linux-gnu
GCC host triplet: ia64-unknown-linux-gnu
GCC target triplet: ia64-unknown-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23835
