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Currently, simplify_vector_constructor () tries to rewrite a CONSTRUCTOR expression into a VEC_PERM_EXPR, as long as constructor elements all come from 1 or 2 source vectors. While doing so, it protects against creating VEC_PERM_EXPRs unsupported by the target by calling can_vec_perm_const_p () before enacting the transformation and bailing when that returns false. However, we can instead allow those VEC_PERM_EXPRs to be created if we know that a later vector lowering pass will legitimize them for us. IOW, only if the target doesn't support the resulting permute and the PROP_gimple_lvec property is already set, do we give up. This patch inserts the required checks. This also allows us to remove the unnecessary vect_int requirement (wrongly added in r16-5244-g5a2319b71e4d30) from forwprop-43.c. (Re-)regtested on aarch64, arm, and x86_64. PR tree-optimization/122679 gcc/ChangeLog: * tree-ssa-forwprop.cc (simplify_vector_constructor): Check the PROP_gimple_lvec property before returning false. gcc/testsuite/ChangeLog: * gcc.dg/tree-ssa/forwprop-43.c: Remove the vect_int check.
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