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This testcase triggered an ICE in rtx_vector_builder::step because we were trying to use a stepped representation for floating-point constants. The underlying problem was that the arguments to rtx_vector_builder were the wrong way around, meaning that some variations were likely to be incorrectly encoded for integers (but probably as a silent failure). Also, aarch64_sve_expand_vector_init_handle_trailing_constants tries to extend the trailing constant elements to a full vector by following the "natural" pattern of the original vector, which should generally lead to nicer constants. However, for the testcase, we'd then end up picking a variable for some elements. Fixed by stubbing out all variable elements with zeros. That fix involved testing valid_for_const_vector_p. For consistency, the patch uses the same test when finding trailing constants, instead of the previous aarch64_legitimate_constant_p. 2020-04-20 Richard Sandiford <richard.sandiford@arm.com> gcc/ PR target/94668 * config/aarch64/aarch64.c (aarch64_sve_expand_vector_init): Fix order of arguments to rtx_vector_builder. (aarch64_sve_expand_vector_init_handle_trailing_constants): Likewise. When extending the trailing constants to a full vector, replace any variables with zeros. gcc/testsuite/ PR target/94668 * gcc.target/aarch64/sve/pr94668.c: New test.
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