https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114958
--- Comment #10 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-12 branch has been updated by Matthias Kretz <mkr...@gcc.gnu.org>: https://gcc.gnu.org/g:fb067547e401940b433cf0d2ae30749b4c21492e commit r12-10570-gfb067547e401940b433cf0d2ae30749b4c21492e Author: Matthias Kretz <m.kr...@gsi.de> Date: Mon May 6 12:13:55 2024 +0200 libstdc++: Use __builtin_shufflevector for simd split and concat Signed-off-by: Matthias Kretz <m.kr...@gsi.de> libstdc++-v3/ChangeLog: PR libstdc++/114958 * include/experimental/bits/simd.h (__as_vector): Return scalar simd as one-element vector. Return vector from single-vector fixed_size simd. (__vec_shuffle): New. (__extract_part): Adjust return type signature. (split): Use __extract_part for any split into non-fixed_size simds. (concat): If the return type stores a single vector, use __vec_shuffle (which calls __builtin_shufflevector) to produce the return value. * include/experimental/bits/simd_builtin.h (__shift_elements_right): Removed. (__extract_part): Return single elements directly. Use __vec_shuffle (which calls __builtin_shufflevector) to for all non-trivial cases. * include/experimental/bits/simd_fixed_size.h (__extract_part): Return single elements directly. * testsuite/experimental/simd/pr114958.cc: New test. (cherry picked from commit fb1649f8b4ad5043dd0e65e4e3a643a0ced018a9)
