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This third patch of three actually fixes the PR. We were using 8-bit BIT_FIELD_REFs to access single-bit elements, and multiplying the vector index by 8 bits rather than 1 bit. 2020-05-12 Richard Sandiford <richard.sandiford@arm.com> gcc/ PR tree-optimization/94980 * tree-vect-generic.c (expand_vector_comparison): Use vector_element_bits_tree to get the element size in bits, rather than using TYPE_SIZE. (expand_vector_condition, vector_element): Likewise. gcc/testsuite/ PR tree-optimization/94980 * gcc.target/i386/pr94980.c: New test.
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