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fa7e05d90b
The vectorizer handles a _Float16 to __bf16 conversion through
vectorizable_assignment, thinking it's a noop. The following
fixes this by requiring the same vector component mode when
checking for CONVERT_EXPR_CODE_P, being stricter than for
VIEW_CONVERT_EXPR.
PR tree-optimization/114921
* tree-vect-stmts.cc (vectorizable_assignment): Require
same vector component modes for input and output for
CONVERT_EXPR_CODE_P.
(cherry picked from commit 87e35da16d)
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