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[Bug tree-optimization/24262] [4.1 Regression] ICE: verify_ssa failed with -O -msse2 -ftree-vectorize
- From: "irar at il dot ibm dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 12 Oct 2005 09:00:13 -0000
- Subject: [Bug tree-optimization/24262] [4.1 Regression] ICE: verify_ssa failed with -O -msse2 -ftree-vectorize
- References: <bug-24262-8707@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #3 from irar at il dot ibm dot com 2005-10-12 09:00 -------
I think, it's the same bug in scev that my autovect patch
http://gcc.gnu.org/ml/gcc-patches/2005-07/msg00252.html solved (and Sebastian
reverted it).
Here scev analyzer calculates the evolution of 'D.1703_5 * 2 + i_15',
where 'D.1703_5 = i_15/2'. Scev doesn't handle division, therefore
for D.1703_5 we get unknown scev, but then it's combined with the
rest of the expression, erroneously leading to {D.1703_5*2, +, 1}.
Ira
--
irar at il dot ibm dot com changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed|2005-10-07 19:27:42 |2005-10-12 09:00:12
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24262