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This commit uses a common implementation 'strnlen-evex-base.S' for both 'strnlen-evex' and 'strnlen-evex512' This patch serves both to reduce the number of implementations, and it also does some small optimizations that benefit strnlen-evex and strnlen-evex512. All tests pass on x86. Benchmarks were taken on SKX. https://www.intel.com/content/www/us/en/products/sku/123613/intel-core-i97900x-xseries-processor-13-75m-cache-up-to-4-30-ghz/specifications.html Geometric mean for strnlen-evex over all benchmarks (N=10) was (new/old) 0.881 Geometric mean for strnlen-evex512 over all benchmarks (N=10) was (new/old) 0.953 Code Size Changes: strnlen-evex : +31 bytes strnlen-evex512 : +156 bytes Reviewed-by: Noah Goldstein <goldstein.w.n@gmail.com>