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27842e2a1e
Add aarch64 vec_widen_lshift_lo/hi patterns and fix bug it triggers in mid-end. This pattern takes one vector with N elements of size S, shifts each element left by the element width and stores the results as N elements of size 2*s (in 2 result vectors). The aarch64 backend implements this with the shll,shll2 instruction pair. gcc/ChangeLog: * config/aarch64/aarch64-simd.md: Add vec_widen_lshift_hi/lo<mode> patterns. * tree-vect-stmts.c (vectorizable_conversion): Fix for widen_lshift case. gcc/testsuite/ChangeLog: * gcc.target/aarch64/vect-widen-lshift.c: New test.
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