[Bug optimization/13653] [3.3 regression] -O2 -funroll-loop miscompiles POOMA testcase

[gdr at integrable-solutions dot net]

------- Additional Comments From gdr at integrable-solutions dot net  2004-02-01 23:31 -------
Subject: Re:  [3.3 regression] -O2 -funroll-loop miscompiles POOMA testcase

"rguenth at tat dot physik dot uni-tuebingen dot de" <gcc-bugzilla@gcc.gnu.org> writes:

| Ok, I identified gcc (GCC) 3.2.3 as point to which this is a regression by
| running uninclude over the (original array_test1.ii and array_test1_reduced.ii)
| testcases and fixing the contained __builtin_va_* uses (which gcc 3.2 doesn't have).
| 
| I also checked the 3.3 and 3.3.2 releases which both contain the bug.
| 
| Maybe the regression hunting script can search for a patch between 3.2.3 and 3.3
| on the reduced testcase? I asked Janis to do this.

Woaw, this detective work is quite impressive!  Many thanks.
Alas, I cannot hold the release on this bug since it already appeared
in a previous release -- that does not mean it is unimportant (quite
the contrary).  We should investigate ways to fix it for 3.3.4 though.

Thanks,

-- Gaby


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13653