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([2804:1b3:a7c0:3d3c:6c87:9be3:8cfc:976d]) by smtp.gmail.com with ESMTPSA id q69-20020a819948000000b005a7fa3ccb32sm1264111ywg.35.2023.10.31.13.09.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 31 Oct 2023 13:09:36 -0700 (PDT) From: Adhemerval Zanella To: libc-alpha@sourceware.org, Noah Goldstein , "H . J . Lu" , Bruce Merry Subject: [PATCH 4/4] x86: Expand the comment on when REP STOSB is used on memset Date: Tue, 31 Oct 2023 17:09:25 -0300 Message-Id: <20231031200925.3297456-5-adhemerval.zanella@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231031200925.3297456-1-adhemerval.zanella@linaro.org> References: <20231031200925.3297456-1-adhemerval.zanella@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=-12.6 required=5.0 tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,GIT_PATCH_0,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS,TXREP,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: --- sysdeps/x86_64/multiarch/memset-vec-unaligned-erms.S | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/sysdeps/x86_64/multiarch/memset-vec-unaligned-erms.S b/sysdeps/x86_64/multiarch/memset-vec-unaligned-erms.S index 3d9ad49cb9..0821b32997 100644 --- a/sysdeps/x86_64/multiarch/memset-vec-unaligned-erms.S +++ b/sysdeps/x86_64/multiarch/memset-vec-unaligned-erms.S @@ -21,7 +21,9 @@ 2. If size is less than VEC, use integer register stores. 3. If size is from VEC_SIZE to 2 * VEC_SIZE, use 2 VEC stores. 4. If size is from 2 * VEC_SIZE to 4 * VEC_SIZE, use 4 VEC stores. - 5. If size is more to 4 * VEC_SIZE, align to 4 * VEC_SIZE with + 5. On machines ERMS feature, if size is greater or equal than + __x86_rep_stosb_threshold then REP STOSB will be used. + 6. If size is more to 4 * VEC_SIZE, align to 4 * VEC_SIZE with 4 VEC stores and store 4 * VEC at a time until done. */ #include -- 2.34.1