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In this PR we had a 512-bit VECTOR_TYPE whose mode is XImode (an integer mode used for four 128-bit vectors). When trying to expand a zero constant for it, we hit code in expand_expr_real_1 that tries to use the associated integer type instead. The code used type_for_mode (XImode, 1) to get this integer type. However, the c-family implementation of type_for_mode checks for any registered built-in type that matches the mode and has the right signedness. This meant that it could return a built-in vector type when given an integer mode (particularly if, as here, the vector type isn't supported by the current subtarget and so TYPE_MODE != TYPE_MODE_RAW). The expand code would then cycle endlessly trying to use this "new" type instead of the original vector type. 2020-03-20 Richard Sandiford <richard.sandiford@arm.com> gcc/c-family/ PR middle-end/94072 * c-common.c (c_common_type_for_mode): Before using a registered built-in type, check that the vectorness of the type matches the vectorness of the mode. gcc/testsuite/ PR middle-end/94072 * gcc.target/aarch64/pr94072.c: New test.
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