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For partial SVE vectors of element X, we want to treat duplicates of single X elements in the same way as for full vectors of X. But if a constant instead contains a repeating pattern of X elements, the transition from one value to the next must happen at container boundaries rather than element boundaries. E.g. a VNx4HI should in that case contain the same number of constants as a VNx4SI. Fixing this means that we need a reinterpret from the container-based mode to the partial mode; e.g. in the above example we need a reinterpret from VNx4SI to VNx4HI. We can't use subregs for that because they're forbidden by aarch64_can_change_class_mode; we should handle them in the same way as for big-endian instead. 2019-12-19 Richard Sandiford <richard.sandiford@arm.com> gcc/ * config/aarch64/aarch64.c (aarch64_simd_valid_immediate): When handling partial SVE vectors, use the container mode rather than the element mode if the constant isn't a single-element duplicate. * config/aarch64/aarch64-sve.md (@aarch64_sve_reinterpret<mode>): Check targetm.can_change_mode_class instead of BYTES_BIG_ENDIAN. gcc/testsuite/ * gcc.target/aarch64/sve/mixed_size_9.c: New test. From-SVN: r279580
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