[Bug middle-end/23181] [4.1 Regression] Slowdown of the bresenham line drawing by roughly 20%

[steven at gcc dot gnu dot org]

------- Comment #22 from steven at gcc dot gnu dot org  2006-01-07 18:33 -------
I compiled the test case nodom.c with "xgcc (GCC) 4.1.0 20060107 (prerelease)"
and ran the resulting executables with "time ./a.out".  And the numbers speak
for themselves:

x86-64 (Nocona):
============================
options: -O2
real    0m0.400s        0m0.394s        0m0.392s
user    0m0.408s        0m0.404s        0m0.400s
sys     0m0.004s        0m0.000s        0m0.000s

options: -O2 -fno-tree-dominator-opts
real    0m0.428s        0m0.433s        0m0.427s
user    0m0.436s        0m0.440s        0m0.436s
sys     0m0.000s        0m0.004s        0m0.000s


x86-64 -m32 (Nocona)
============================
options: -O2 -m32
real    0m0.394s        0m0.364s        0m0.387s
user    0m0.404s        0m0.372s        0m0.396s
sys     0m0.000s        0m0.000s        0m0.000s

options: -O2 -m32 -fno-tree-dominator-opts
real    0m0.554s        0m0.553s        0m0.557s
user    0m0.568s        0m0.564s        0m0.572s
sys     0m0.000s        0m0.000s        0m0.000s


x86-64 -m32 -march=pentium4
============================
options: -O2 -m32 -march=pentium4
real    0m0.335s        0m0.338s        0m0.343s
user    0m0.344s        0m0.344s        0m0.352s
sys     0m0.000s        0m0.000s        0m0.000s

options: -O2 -m32 -fno-tree-dominator-opts -march=pentium4
real    0m0.405s        0m0.407s        0m0.400s
user    0m0.416s        0m0.416s        0m0.408s
sys     0m0.000s        0m0.000s        0m0.000s


'nuff said.  Closing as fixed.


-- 

steven at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23181