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[Bug tree-optimization/26854] Inordinate compile times on large routines
- From: "lucier at math dot purdue dot edu" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 10 Jan 2007 18:49:38 -0000
- Subject: [Bug tree-optimization/26854] Inordinate compile times on large routines
- References: <bug-26854-271@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #24 from lucier at math dot purdue dot edu 2007-01-10 18:49 -------
Tried it again with today's 4.2.0:
euler-34% /pkgs/gcc-4.2.0-test/bin/gcc -v
Using built-in specs.
Target: x86_64-unknown-linux-gnu
Configured with: ../configure --prefix=/pkgs/gcc-4.2.0-test
--with-gmp=/pkgs/gmp-4.2.1 --with-mpfr=/pkgs/gmp-4.2.1
Thread model: posix
gcc version 4.2.0 20070110 (prerelease)
The two hot spots were
tree SSA to normal : 52.63 (16%) usr 0.04 ( 0%) sys 52.69 (15%) wall
55617 kB ( 8%) ggc
tree FRE : 150.81 (46%) usr 0.20 ( 2%) sys 154.00 (45%) wall
18940 kB ( 3%) ggc
while
tree alias analysis : 1.94 ( 1%) usr 0.58 ( 5%) sys 2.18 ( 1%) wall
387 kB ( 0%) ggc
is now very low.
Is there a patch than can be back-ported from mainline to fix tree SSA to
normal? On mainline there is the tremendous result of
tree SSA to normal : 5.23 ( 1%) usr 0.06 ( 0%) sys 5.30 ( 1%) wall
52594 kB ( 7%) ggc
On another note, can I change this to be reported against 4.2.0?
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26854