> From: Scott Mitchell <[email protected]> > > Modify RTE_PTR_ADD and RTE_PTR_SUB to use char* pointer arithmetic > on Clang instead of uintptr_t casts. Benefits of this approach: > - API compatibility: works for both integer and pointer inputs > - Retains simple macros: no pragmas, no _Generic > - Enables Clang optimizations: Clang can now unroll and vectorize > pointer loops. GCC uses uintptr_t to avoid false positive warnings. > > Example use case which benefits is __rte_raw_cksum. Performance > results from cksum_perf_autotest on Intel Xeon (Cascade Lake, > AVX-512) built with Clang 18.1 (TSC cycles/byte): > Block size Before After Improvement > 100 0.40 0.24 ~40% > 1500 0.50 0.06 ~8x > 9000 0.49 0.06 ~8x > > Signed-off-by: Scott Mitchell <[email protected]>
Acked-by: Morten Brørup <[email protected]>
