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[76.191.17.161]) by smtp.googlemail.com with ESMTPSA id h10sm10224923ilj.71.2021.08.24.12.32.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 24 Aug 2021 12:32:40 -0700 (PDT) To: libc-alpha@sourceware.org Subject: [PATCH v1 3/5] benchtests: Add partial overlap case in bench-memmove-walk.c Date: Tue, 24 Aug 2021 15:32:25 -0400 Message-Id: <20210824193227.3474346-3-goldstein.w.n@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210824193227.3474346-1-goldstein.w.n@gmail.com> References: <20210824082753.3356637-1-goldstein.w.n@gmail.com> <20210824193227.3474346-1-goldstein.w.n@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , From: Noah Goldstein via Libc-alpha Reply-To: Noah Goldstein Errors-To: libc-alpha-bounces+e=80x24.org@sourceware.org Sender: "Libc-alpha" This commit adds a new partial overlap benchmark. This is generally the most interesting performance case for memmove and was missing. --- benchtests/bench-memmove-walk.c | 67 ++++++++++++++++++++++++--------- 1 file changed, 49 insertions(+), 18 deletions(-) diff --git a/benchtests/bench-memmove-walk.c b/benchtests/bench-memmove-walk.c index b5fdb2a422..18b716f5cb 100644 --- a/benchtests/bench-memmove-walk.c +++ b/benchtests/bench-memmove-walk.c @@ -36,6 +36,10 @@ # define TIMEOUT (20 * 60) # include "bench-string.h" +#define NO_OVERLAP 0 +#define PARTIAL_OVERLAP 1 +#define COMPLETE_OVERLAP 2 + IMPL (memmove, 1) #endif @@ -66,20 +70,40 @@ do_one_test (json_ctx_t *json_ctx, impl_t *impl, char *dst, char *src, } static void -do_test (json_ctx_t *json_ctx, size_t len, bool overlap) +do_test (json_ctx_t *json_ctx, size_t len, int overlap, int both_ways) { - json_element_object_begin (json_ctx); - json_attr_uint (json_ctx, "length", (double) len); - json_array_begin (json_ctx, "timings"); - - if (overlap) - buf2 = buf1; - - FOR_EACH_IMPL (impl, 0) - do_one_test (json_ctx, impl, (char *) buf2, (char *) buf1, len); - - json_array_end (json_ctx); - json_element_object_end (json_ctx); + char *s1, *s2, *tmp; + size_t repeats; + + s1 = (char *) (buf1); + s2 = (char *) (buf2); + if (overlap != NO_OVERLAP) + s2 = s1; + if (overlap == PARTIAL_OVERLAP) + s2 += len / 2; + + for (repeats = both_ways ? 2 : 1; repeats; --repeats) + { + json_element_object_begin (json_ctx); + json_attr_uint (json_ctx, "length", (double) len); + json_attr_string(json_ctx, "overlap", + overlap == NO_OVERLAP ? "none" + : overlap == PARTIAL_OVERLAP ? "partial" + : "complete"); + json_attr_uint (json_ctx, "dst > src", (double) (s2 > s1)); + json_array_begin (json_ctx, "timings"); + + + FOR_EACH_IMPL (impl, 0) + do_one_test (json_ctx, impl, (char *) buf2, (char *) buf1, len); + + json_array_end (json_ctx); + json_element_object_end (json_ctx); + + tmp = s1; + s1 = s2; + s2 = tmp; + } } int @@ -107,15 +131,22 @@ test_main (void) /* Non-overlapping buffers. */ for (size_t i = START_SIZE; i <= MIN_PAGE_SIZE; i <<= 1) { - do_test (&json_ctx, i, false); - do_test (&json_ctx, i + 1, false); + do_test (&json_ctx, i, NO_OVERLAP, 1); + do_test (&json_ctx, i + 1, NO_OVERLAP, 1); + } + + /* Partially-overlapping buffers. */ + for (size_t i = START_SIZE; i <= MIN_PAGE_SIZE / 2; i <<= 1) + { + do_test (&json_ctx, i, PARTIAL_OVERLAP, 1); + do_test (&json_ctx, i + 1, PARTIAL_OVERLAP, 1); } - /* Overlapping buffers. */ + /* Complete-overlapping buffers. */ for (size_t i = START_SIZE; i <= MIN_PAGE_SIZE; i <<= 1) { - do_test (&json_ctx, i, true); - do_test (&json_ctx, i + 1, true); + do_test (&json_ctx, i, COMPLETE_OVERLAP, 0); + do_test (&json_ctx, i + 1, COMPLETE_OVERLAP, 0); } json_array_end (&json_ctx); -- 2.25.1