This is the mail archive of the
gcc-bugs@gcc.gnu.org
mailing list for the GCC project.
[Bug middle-end/45297] [4.6 Regression] ICE: in create_linear_expr_from_tree, at graphite-sese-to-poly.c:1210 with -Os -fgraphite-identity
- From: "spop at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Wed, 1 Dec 2010 20:15:50 +0000
- Subject: [Bug middle-end/45297] [4.6 Regression] ICE: in create_linear_expr_from_tree, at graphite-sese-to-poly.c:1210 with -Os -fgraphite-identity
- Auto-submitted: auto-generated
- References: <bug-45297-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45297
--- Comment #11 from Sebastian Pop <spop at gcc dot gnu.org> 2010-12-01 20:15:29 UTC ---
In this code:
<bb 3>:
q_5 = &MEM[(void *)q_1 + 4294967288B];
<bb 4>:
# q_1 = PHI <q_3(2), q_5(3)>
if (q_1 != p_2(D))
goto <bb 3>;
else
goto <bb 5>;
scev analysis is able to determine that q1 = {q_3, +, -8}_1 and in the
same time, scev fails to analyze q5. And that triggers a rewrite of
q_5 out of SSA making the scev analysis of q1 impossible.