In this PR, SLP failed to include a comparison node in the SLP
tree and so marked the node as external. It then went on to call
vect_is_simple_use on the comparison with its STMT_VINFO_DEF_TYPE
still claiming that it was an internal definition.
We already avoid that for vect_analyze_stmt by temporarily copying
the node's definition type to each STMT_VINFO_DEF_TYPE. This patch
extends that to the vector type calculation. The easiest thing
seemed to be to split the analysis of the root node out into
a subroutine, so that it's possible to return false early without
awkward control flow.
2018-05-23 Richard Sandiford <richard.sandiford@linaro.org>
gcc/
PR tree-optimization/85853
* tree-vect-slp.c (vect_slp_analyze_node_operations): Split out
the handling of the root of the node to...
(vect_slp_analyze_node_operations_1): ...this new function,
and run the whole thing with the child nodes' def types
set according to their SLP node's def type.
gcc/testsuite/
PR tree-optimization/85853
* gfortran.dg/vect/pr85853.f90: New test.
From-SVN: r260601
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