[Bug middle-end/39157] Code that compiles fine in 1GB of memory with 4.1.2 requires > 20GB in 4.2.* and higher

[lucier at math dot purdue dot edu]

------- Comment #15 from lucier at math dot purdue dot edu  2009-02-12 16:35 -------
Some comments (a lot went on while I was sleeping):

1.  Yes, this is similar to the test case of PR26854, but the C code generator
has changed significantly since that test case was filed.  I don't know if the
changes in the code generator really affect what's happening here, however.

2.  I'm trying to get a "moderately" sized test case that will compile in about
3GB of RAM, as Steven requested.  (The test case from PR26854 takes at least
7GB of RAM to compile on ppc64.)

3.  If the amount of memory and cpu time required by the test case at -O1
doesn't increase significantly when loop-invariant motion is performed on loops
of size up to 10,000, then it would be good if the parameter at -O1 could be
10,000 instead of 100 (or at least larger than 100), as is suggested in the
most recent patch.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39157