middle-end/105049 - fix uniform_vector_p and vector CTOR gimplification
We have
return VIEW_CONVERT_EXPR<U>( VEC_PERM_EXPR < {<<< Unknown tree: compound_literal_expr
V D.1984 = { 0 }; >>>, { 0 }} , {<<< Unknown tree: compound_literal_expr
V D.1985 = { 0 }; >>>, { 0 }} , { 0, 0 } > & {(short int) SAVE_EXPR <c>, (short int) SAVE_EXPR <c>});
where we gimplify the init CTORs to
_1 = {{ 0 }, { 0 }};
_2 = {{ 0 }, { 0 }};
instead of to vector constants. That later runs into a bug in
uniform_vector_p which doesn't handle CTORs of vector elements
correctly.
The following adjusts uniform_vector_p to handle CTORs of vector
elements.
2022-03-25 Richard Biener <rguenther@suse.de>
PR middle-end/105049
* tree.cc (uniform_vector_p): Recurse for VECTOR_CST or
CONSTRUCTOR first elements.
* gcc.dg/pr105049.c: New testcase.