[Bug target/37364] [4.4 Regression] IRA generates inefficient code due to missing regmove pass

[hjl dot tools at gmail dot com]

------- Comment #22 from hjl dot tools at gmail dot com  2008-10-28 01:12 -------
Created an attachment (id=16571)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=16571&action=view)
A patch to re-enable regmove

After applying this patch to re-enable regmove, I got

[hjl@gnu-6 gcc]$ ./xgcc -B./ -O2 -mtune=core2 /tmp/foo.c -o noira -fno-ira -m32
[hjl@gnu-6 gcc]$ ./xgcc -B./ -O2 -mtune=core2 /tmp/foo.c -o ira -m32
[hjl@gnu-6 gcc]$ time ./ira

real    0m7.307s
user    0m7.305s
sys     0m0.001s
[hjl@gnu-6 gcc]$ time ./noira

real    0m7.478s
user    0m7.474s
sys     0m0.002s
[hjl@gnu-6 gcc]$


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37364