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Myers" Cc: gcc-patches@gcc.gnu.org Subject: [PATCH] libgcc: Fix a bug in _BitInt -> dfp conversions Message-ID: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.9 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Disposition: inline X-Spam-Status: No, score=-3.9 required=5.0 tests=BAYES_00, DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2, SPF_HELO_NONE, SPF_NONE, 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 X-BeenThere: gcc-patches@gcc.gnu.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Gcc-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Jakub Jelinek Errors-To: gcc-patches-bounces+ouuuleilei=gmail.com@gcc.gnu.org X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1790505367678674270 X-GMAIL-MSGID: 1790505367678674270 Hi! The ia32 _BitInt support revealed a bug in floatbitint?d.c. As can be even guessed from how the code is written in the loop, the intention was to set inexact to non-zero whenever the remainder after division wasn't zero, but I've ended up just checking whether the 2 least significant limbs of the remainder were non-zero. Now, in the dfp/bitint-4.c test in one case the remainder happens to have least significant 64 bits zero and then the higher limbs are non-zero; with 32-bit limbs that means 2 least significant limbs are zero and so the code acted as if it was exactly divisible. Fixed thusly, bootstrapped/regtested on x86_64-linux and i686-linux (including the _BitInt enablement there), ok for trunk? 2024-02-10 Jakub Jelinek * soft-fp/floatbitintdd.c (__bid_floatbitintdd): Or in all remainder limbs into inexact rather than just first two. * soft-fp/floatbitintsd.c (__bid_floatbitintsd): Likewise. * soft-fp/floatbitinttd.c (__bid_floatbitinttd): Likewise. Jakub --- libgcc/soft-fp/floatbitintdd.c.jj 2024-02-09 17:11:47.095675716 +0100 +++ libgcc/soft-fp/floatbitintdd.c 2024-02-09 18:22:25.786674139 +0100 @@ -114,7 +114,7 @@ __bid_floatbitintdd (const UBILtype *i, buf + BITINT_END (q_limbs - 1, 0), q_limbs); inexact = buf[q_limbs + pow10_limbs]; for (j = 1; j < pow10_limbs; ++j) - inexact |= buf[q_limbs + pow10_limbs + 1]; + inexact |= buf[q_limbs + pow10_limbs + j]; } else { --- libgcc/soft-fp/floatbitintsd.c.jj 2023-09-06 17:34:04.978510447 +0200 +++ libgcc/soft-fp/floatbitintsd.c 2024-02-09 18:21:50.949158569 +0100 @@ -113,7 +113,7 @@ __bid_floatbitintsd (const UBILtype *i, buf + BITINT_END (q_limbs - 1, 0), q_limbs); inexact = buf[q_limbs + pow10_limbs]; for (j = 1; j < pow10_limbs; ++j) - inexact |= buf[q_limbs + pow10_limbs + 1]; + inexact |= buf[q_limbs + pow10_limbs + j]; } else { --- libgcc/soft-fp/floatbitinttd.c.jj 2024-02-09 17:14:17.485578556 +0100 +++ libgcc/soft-fp/floatbitinttd.c 2024-02-09 18:21:34.409388566 +0100 @@ -113,7 +113,7 @@ __bid_floatbitinttd (const UBILtype *i, buf + BITINT_END (q_limbs - 1, 0), q_limbs); inexact = buf[q_limbs + pow10_limbs]; for (j = 1; j < pow10_limbs; ++j) - inexact |= buf[q_limbs + pow10_limbs + 1]; + inexact |= buf[q_limbs + pow10_limbs + j]; } else {