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While looking at the vectorization for following example, we realized that even though vectorizable_shift function was distinguishing vector shifted by vector from vector shifted by scalar, while modelling the cost it would always add the cost of building a vector constant despite not needing it for vector shifted by scalar. This patch fixes this by using scalar_shift_arg to determine whether we need to build a vector for the second operand or not. This causes the test case below to now vectorize. gcc/ChangeLog: 2019-12-09 Sudakshina Das <sudi.das@arm.com> Richard Sandiford <richard.sandiford@arm.com> * tree-vect-stmt.c (vectorizable_shift): Condition ndts for vect_model_simple_cost call on scalar_shift_arg. gcc/testsuite/ChangeLog: 2019-12-09 Sudakshina Das <sudi.das@arm.com> * gcc.dg/vect/vect-shift-5.c: New test. Co-Authored-By: Richard Sandiford <richard.sandiford@arm.com> From-SVN: r279114 |
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