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GCC [1] now assigns even register pairs for CASP, the fix has also been backported to all stable releases of older GCC versions. Removing the manual register allocation allows GCC to inline the functions and pick optimal registers for performing CASP. 1: https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=563cc649beaf Signed-off-by: Pavan Nikhilesh <pbhagavatula@marvell.com> Acked-by: Ruifeng Wang <ruifeng.wang@arm.com>