[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
spop at gcc dot gnu.org
gcc-bugzilla@gcc.gnu.org
Wed Dec 1 20:16:00 GMT 2010
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.
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