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The documentation for POST_MODIFY says: Currently, the compiler can only handle second operands of the form (plus (reg) (reg)) and (plus (reg) (const_int)), where the first operand of the PLUS has to be the same register as the first operand of the *_MODIFY. The following testcase ICEs, because combine just attempts to simplify things and ends up with (post_modify (reg1) (plus (mult (reg2) (const_int 4)) (reg1)) but the target predicates accept it, because they only verify that POST_MODIFY's second operand is PLUS and the second operand of the PLUS is a REG. The following patch fixes this by performing further verification that the POST_MODIFY is in the form it should be. 2020-11-20 Jakub Jelinek <jakub@redhat.com> PR target/97528 * config/arm/arm.c (neon_vector_mem_operand): For POST_MODIFY, require first POST_MODIFY operand is a REG and is equal to the first operand of PLUS. * gcc.target/arm/pr97528.c: New test.
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