[Bug tree-optimization/63914] ICE in set_lattice_value, at tree-ssa-ccp.c:517

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63914

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
We try to transition from

{ Inf, 0.0, 0.0, 0.0 } * { 0.0, 0.0, 0.0, 0.0 } == {  Nan, 0.0, 0.0, 0.0 }

to

VARYING * { 0.0, 0.0, 0.0, 0.0 } == { 0.0, 0.0, 0.0, 0.0 }

which is... "interesting".  -ffast-math allows for this as it considers
-ffinite-math-only for which the first constant folding returns an
"invalid" number.  Hmm.

We have canonicalize_value that is supposed to catch this but it fails to
handle VECTOR_CSTs or COMPLEX_CSTs properly.