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[2001:8b0:bf73:93f7::51bb:e332]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-429ded71cdcsm88413555e9.30.2024.08.16.15.26.18 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 16 Aug 2024 15:26:19 -0700 (PDT) Received: from jsm28 (helo=localhost) by digraph.polyomino.org.uk with local-esmtp (Exim 4.95) (envelope-from ) id 1sf5O7-009D5p-2i for libc-alpha@sourceware.org; Fri, 16 Aug 2024 22:25:39 +0000 Date: Fri, 16 Aug 2024 22:25:39 +0000 (UTC) From: Joseph Myers To: libc-alpha@sourceware.org Subject: Fix strtod subnormal rounding (bug 30220) Message-ID: <8360e087-313-c9e-a4a3-613ce06d296c@redhat.com> MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com X-Spam-Status: No, score=-9.0 required=5.0 tests=BAYES_00, DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, KAM_LOTSOFHASH, RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H3, RCVD_IN_MSPIKE_WL, 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: libc-alpha@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: libc-alpha-bounces~patchwork=sourceware.org@sourceware.org As reported in bug 30220, the implementation of strtod-family functions has a bug in the following case: the input string would, with infinite exponent range, take one more bit to represent than is available in the normal precision of the return type; the value represented is in the subnormal range; and there are no nonzero bits in the value, below those that can be represented in subnormal precision, other than the least significant bit and possibly the 0.5ulp bit. In this case, round_and_return ends up discarding the least significant bit. Fix by saving that bit to merge into more_bits (it can't be merged in at the time it's computed, because more_bits mustn't include this bit in the case of after-rounding tininess detection checking if the result is still subnormal when rounded to normal precision, so merging this bit into more_bits needs to take place after that check). Tested for x86_64. --- This patch is relative to a tree with (pending review) applied. There is no logical dependency on that patch; it's simply that both of them involve regenerating tst-strtod-round-data.h. diff --git a/stdlib/strtod_l.c b/stdlib/strtod_l.c index be515ce659..beb97b3d0c 100644 --- a/stdlib/strtod_l.c +++ b/stdlib/strtod_l.c @@ -222,6 +222,7 @@ round_and_return (mp_limb_t *retval, intmax_t exponent, int negative, mp_size_t shift = MIN_EXP - 1 - exponent; bool is_tiny = true; + bool old_half_bit = (round_limb & (((mp_limb_t) 1) << round_bit)) != 0; more_bits |= (round_limb & ((((mp_limb_t) 1) << round_bit) - 1)) != 0; if (shift == MANT_DIG) @@ -292,6 +293,7 @@ round_and_return (mp_limb_t *retval, intmax_t exponent, int negative, round_bit = shift - 1; (void) __mpn_rshift (retval, retval, RETURN_LIMB_SIZE, shift); } + more_bits |= old_half_bit; /* This is a hook for the m68k long double format, where the exponent bias is the same for normalized and denormalized numbers. */ diff --git a/stdlib/tst-strtod-round-data b/stdlib/tst-strtod-round-data index 84ab705709..9489fbcc9c 100644 --- a/stdlib/tst-strtod-round-data +++ b/stdlib/tst-strtod-round-data @@ -265,3 +265,15 @@ 1.000000000000000000000000000000000385185988877447170611195588516985463707620329643077639047987759113311767578125 1.0000000000000000000000000000000001925929944387235853055977942584927318538101648215388195239938795566558837890625 1.00000000000000000000000000000000009629649721936179265279889712924636592690508241076940976199693977832794189453125 +0x30000002222225p-1077 +0x0.7fffffffffffeap-1022 +0x0.7fffffffffffe9p-1022 +0x0.7ffffd4p-126 +0x0.7ffffffffffffffd4p-16382 +0x0.7ffffffffffffffd4p-16383 +0x0.7ffffffffffffffffffffffffffeap-16382 +0x0.7000004p-126 +0x0.70000000000002p-1022 +0x0.70000000000000004p-16382 +0x0.70000000000000004p-16383 +0x0.70000000000000000000000000002p-16382 diff --git a/stdlib/tst-strtod-round-data.h b/stdlib/tst-strtod-round-data.h index 13e62dd2b0..ed50eb2537 100644 --- a/stdlib/tst-strtod-round-data.h +++ b/stdlib/tst-strtod-round-data.h @@ -15437,4 +15437,376 @@ static const struct test tests[] = { 0x1p+0, false, false, 0x1p+0, false, false, 0x1.0000000000000000000000000001p+0, false, false), + TEST ("0x30000002222225p-1077", + false, + 0x0p+0, false, true, + 0x0p+0, false, true, + 0x0p+0, false, true, + 0x8p-152, false, true, + false, + 0x1.800000111111p-1024, false, true, + 0x1.8000001111114p-1024, false, true, + 0x1.800000111111p-1024, false, true, + 0x1.8000001111114p-1024, false, true, + true, + 0x1.80000011111128p-1024, false, false, + 0x1.80000011111128p-1024, false, false, + 0x1.80000011111128p-1024, false, false, + 0x1.80000011111128p-1024, false, false, + true, + 0x1.80000011111128p-1024, false, false, + 0x1.80000011111128p-1024, false, false, + 0x1.80000011111128p-1024, false, false, + 0x1.80000011111128p-1024, false, false, + false, + 0x1.800000111111p-1024, false, true, + 0x1.8000001111114p-1024, false, true, + 0x1.800000111111p-1024, false, true, + 0x1.8000001111114p-1024, false, true, + true, + 0x1.80000011111128p-1024, false, false, + 0x1.80000011111128p-1024, false, false, + 0x1.80000011111128p-1024, false, false, + 0x1.80000011111128p-1024, false, false), + TEST ("0x0.7fffffffffffeap-1022", + false, + 0x0p+0, false, true, + 0x0p+0, false, true, + 0x0p+0, false, true, + 0x8p-152, false, true, + false, + 0x1.ffffffffffff8p-1024, false, true, + 0x1.ffffffffffffcp-1024, false, true, + 0x1.ffffffffffff8p-1024, false, true, + 0x1.ffffffffffffcp-1024, false, true, + true, + 0x1.ffffffffffffa8p-1024, false, false, + 0x1.ffffffffffffa8p-1024, false, false, + 0x1.ffffffffffffa8p-1024, false, false, + 0x1.ffffffffffffa8p-1024, false, false, + true, + 0x1.ffffffffffffa8p-1024, false, false, + 0x1.ffffffffffffa8p-1024, false, false, + 0x1.ffffffffffffa8p-1024, false, false, + 0x1.ffffffffffffa8p-1024, false, false, + false, + 0x1.ffffffffffff8p-1024, false, true, + 0x1.ffffffffffffcp-1024, false, true, + 0x1.ffffffffffff8p-1024, false, true, + 0x1.ffffffffffffcp-1024, false, true, + true, + 0x1.ffffffffffffa8p-1024, false, false, + 0x1.ffffffffffffa8p-1024, false, false, + 0x1.ffffffffffffa8p-1024, false, false, + 0x1.ffffffffffffa8p-1024, false, false), + TEST ("0x0.7fffffffffffe9p-1022", + false, + 0x0p+0, false, true, + 0x0p+0, false, true, + 0x0p+0, false, true, + 0x8p-152, false, true, + false, + 0x1.ffffffffffff8p-1024, false, true, + 0x1.ffffffffffffcp-1024, false, true, + 0x1.ffffffffffff8p-1024, false, true, + 0x1.ffffffffffffcp-1024, false, true, + true, + 0x1.ffffffffffffa4p-1024, false, false, + 0x1.ffffffffffffa4p-1024, false, false, + 0x1.ffffffffffffa4p-1024, false, false, + 0x1.ffffffffffffa4p-1024, false, false, + true, + 0x1.ffffffffffffa4p-1024, false, false, + 0x1.ffffffffffffa4p-1024, false, false, + 0x1.ffffffffffffa4p-1024, false, false, + 0x1.ffffffffffffa4p-1024, false, false, + false, + 0x1.ffffffffffff8p-1024, false, true, + 0x1.ffffffffffffcp-1024, false, true, + 0x1.ffffffffffff8p-1024, false, true, + 0x1.ffffffffffffcp-1024, false, true, + true, + 0x1.ffffffffffffa4p-1024, false, false, + 0x1.ffffffffffffa4p-1024, false, false, + 0x1.ffffffffffffa4p-1024, false, false, + 0x1.ffffffffffffa4p-1024, false, false), + TEST ("0x0.7ffffd4p-126", + false, + 0x1.fffffp-128, false, true, + 0x1.fffff8p-128, false, true, + 0x1.fffffp-128, false, true, + 0x1.fffff8p-128, false, true, + true, + 0x1.fffff5p-128, false, false, + 0x1.fffff5p-128, false, false, + 0x1.fffff5p-128, false, false, + 0x1.fffff5p-128, false, false, + true, + 0x1.fffff5p-128, false, false, + 0x1.fffff5p-128, false, false, + 0x1.fffff5p-128, false, false, + 0x1.fffff5p-128, false, false, + true, + 0x1.fffff5p-128, false, false, + 0x1.fffff5p-128, false, false, + 0x1.fffff5p-128, false, false, + 0x1.fffff5p-128, false, false, + true, + 0x1.fffff5p-128, false, false, + 0x1.fffff5p-128, false, false, + 0x1.fffff5p-128, false, false, + 0x1.fffff5p-128, false, false, + true, + 0x1.fffff5p-128, false, false, + 0x1.fffff5p-128, false, false, + 0x1.fffff5p-128, false, false, + 0x1.fffff5p-128, false, false), + TEST ("0x0.7ffffffffffffffd4p-16382", + false, + 0x0p+0, false, true, + 0x0p+0, false, true, + 0x0p+0, false, true, + 0x8p-152, false, true, + false, + 0x0p+0, false, true, + 0x0p+0, false, true, + 0x0p+0, false, true, + 0x4p-1076, false, true, + false, + 0x1.fffffffffffffffp-16384, false, true, + 0x1.fffffffffffffff8p-16384, false, true, + 0x1.fffffffffffffffp-16384, false, true, + 0x1.fffffffffffffff8p-16384, false, true, + false, + 0x1.fffffffffffffff4p-16384, false, true, + 0x1.fffffffffffffff4p-16384, false, true, + 0x1.fffffffffffffff4p-16384, false, true, + 0x1.fffffffffffffff8p-16384, false, true, + false, + 0x0p+0, false, true, + 0x0p+0, false, true, + 0x0p+0, false, true, + 0x4p-1076, false, true, + true, + 0x1.fffffffffffffff5p-16384, false, false, + 0x1.fffffffffffffff5p-16384, false, false, + 0x1.fffffffffffffff5p-16384, false, false, + 0x1.fffffffffffffff5p-16384, false, false), + TEST ("0x0.7ffffffffffffffd4p-16383", + false, + 0x0p+0, false, true, + 0x0p+0, false, true, + 0x0p+0, false, true, + 0x8p-152, false, true, + false, + 0x0p+0, false, true, + 0x0p+0, false, true, + 0x0p+0, false, true, + 0x4p-1076, false, true, + false, + 0xf.ffffffffffffff8p-16388, false, true, + 0xf.ffffffffffffff8p-16388, false, true, + 0xf.ffffffffffffff8p-16388, false, true, + 0x1p-16384, false, true, + false, + 0xf.ffffffffffffff8p-16388, false, true, + 0xf.ffffffffffffffcp-16388, false, true, + 0xf.ffffffffffffff8p-16388, false, true, + 0xf.ffffffffffffffcp-16388, false, true, + false, + 0x0p+0, false, true, + 0x0p+0, false, true, + 0x0p+0, false, true, + 0x4p-1076, false, true, + true, + 0xf.ffffffffffffffa8p-16388, false, false, + 0xf.ffffffffffffffa8p-16388, false, false, + 0xf.ffffffffffffffa8p-16388, false, false, + 0xf.ffffffffffffffa8p-16388, false, false), + TEST ("0x0.7ffffffffffffffffffffffffffeap-16382", + false, + 0x0p+0, false, true, + 0x0p+0, false, true, + 0x0p+0, false, true, + 0x8p-152, false, true, + false, + 0x0p+0, false, true, + 0x0p+0, false, true, + 0x0p+0, false, true, + 0x4p-1076, false, true, + false, + 0x1.fffffffffffffff8p-16384, false, true, + 0x2p-16384, false, true, + 0x1.fffffffffffffff8p-16384, false, true, + 0x2p-16384, false, true, + false, + 0x1.fffffffffffffffcp-16384, false, true, + 0x2p-16384, false, true, + 0x1.fffffffffffffffcp-16384, false, true, + 0x2p-16384, false, true, + false, + 0x0p+0, false, true, + 0x0p+0, false, true, + 0x0p+0, false, true, + 0x4p-1076, false, true, + false, + 0x1.fffffffffffffffffffffffffff8p-16384, false, true, + 0x1.fffffffffffffffffffffffffffcp-16384, false, true, + 0x1.fffffffffffffffffffffffffff8p-16384, false, true, + 0x1.fffffffffffffffffffffffffffcp-16384, false, true), + TEST ("0x0.7000004p-126", + false, + 0x1.cp-128, false, true, + 0x1.cp-128, false, true, + 0x1.cp-128, false, true, + 0x1.c00008p-128, false, true, + true, + 0x1.c00001p-128, false, false, + 0x1.c00001p-128, false, false, + 0x1.c00001p-128, false, false, + 0x1.c00001p-128, false, false, + true, + 0x1.c00001p-128, false, false, + 0x1.c00001p-128, false, false, + 0x1.c00001p-128, false, false, + 0x1.c00001p-128, false, false, + true, + 0x1.c00001p-128, false, false, + 0x1.c00001p-128, false, false, + 0x1.c00001p-128, false, false, + 0x1.c00001p-128, false, false, + true, + 0x1.c00001p-128, false, false, + 0x1.c00001p-128, false, false, + 0x1.c00001p-128, false, false, + 0x1.c00001p-128, false, false, + true, + 0x1.c00001p-128, false, false, + 0x1.c00001p-128, false, false, + 0x1.c00001p-128, false, false, + 0x1.c00001p-128, false, false), + TEST ("0x0.70000000000002p-1022", + false, + 0x0p+0, false, true, + 0x0p+0, false, true, + 0x0p+0, false, true, + 0x8p-152, false, true, + false, + 0x1.cp-1024, false, true, + 0x1.cp-1024, false, true, + 0x1.cp-1024, false, true, + 0x1.c000000000004p-1024, false, true, + true, + 0x1.c0000000000008p-1024, false, false, + 0x1.c0000000000008p-1024, false, false, + 0x1.c0000000000008p-1024, false, false, + 0x1.c0000000000008p-1024, false, false, + true, + 0x1.c0000000000008p-1024, false, false, + 0x1.c0000000000008p-1024, false, false, + 0x1.c0000000000008p-1024, false, false, + 0x1.c0000000000008p-1024, false, false, + false, + 0x1.cp-1024, false, true, + 0x1.cp-1024, false, true, + 0x1.cp-1024, false, true, + 0x1.c000000000004p-1024, false, true, + true, + 0x1.c0000000000008p-1024, false, false, + 0x1.c0000000000008p-1024, false, false, + 0x1.c0000000000008p-1024, false, false, + 0x1.c0000000000008p-1024, false, false), + TEST ("0x0.70000000000000004p-16382", + false, + 0x0p+0, false, true, + 0x0p+0, false, true, + 0x0p+0, false, true, + 0x8p-152, false, true, + false, + 0x0p+0, false, true, + 0x0p+0, false, true, + 0x0p+0, false, true, + 0x4p-1076, false, true, + false, + 0x1.cp-16384, false, true, + 0x1.cp-16384, false, true, + 0x1.cp-16384, false, true, + 0x1.c000000000000008p-16384, false, true, + false, + 0x1.cp-16384, false, true, + 0x1.cp-16384, false, true, + 0x1.cp-16384, false, true, + 0x1.c000000000000004p-16384, false, true, + false, + 0x0p+0, false, true, + 0x0p+0, false, true, + 0x0p+0, false, true, + 0x4p-1076, false, true, + true, + 0x1.c000000000000001p-16384, false, false, + 0x1.c000000000000001p-16384, false, false, + 0x1.c000000000000001p-16384, false, false, + 0x1.c000000000000001p-16384, false, false), + TEST ("0x0.70000000000000004p-16383", + false, + 0x0p+0, false, true, + 0x0p+0, false, true, + 0x0p+0, false, true, + 0x8p-152, false, true, + false, + 0x0p+0, false, true, + 0x0p+0, false, true, + 0x0p+0, false, true, + 0x4p-1076, false, true, + false, + 0xep-16388, false, true, + 0xep-16388, false, true, + 0xep-16388, false, true, + 0xe.000000000000008p-16388, false, true, + false, + 0xep-16388, false, true, + 0xep-16388, false, true, + 0xep-16388, false, true, + 0xe.000000000000004p-16388, false, true, + false, + 0x0p+0, false, true, + 0x0p+0, false, true, + 0x0p+0, false, true, + 0x4p-1076, false, true, + true, + 0xe.0000000000000008p-16388, false, false, + 0xe.0000000000000008p-16388, false, false, + 0xe.0000000000000008p-16388, false, false, + 0xe.0000000000000008p-16388, false, false), + TEST ("0x0.70000000000000000000000000002p-16382", + false, + 0x0p+0, false, true, + 0x0p+0, false, true, + 0x0p+0, false, true, + 0x8p-152, false, true, + false, + 0x0p+0, false, true, + 0x0p+0, false, true, + 0x0p+0, false, true, + 0x4p-1076, false, true, + false, + 0x1.cp-16384, false, true, + 0x1.cp-16384, false, true, + 0x1.cp-16384, false, true, + 0x1.c000000000000008p-16384, false, true, + false, + 0x1.cp-16384, false, true, + 0x1.cp-16384, false, true, + 0x1.cp-16384, false, true, + 0x1.c000000000000004p-16384, false, true, + false, + 0x0p+0, false, true, + 0x0p+0, false, true, + 0x0p+0, false, true, + 0x4p-1076, false, true, + false, + 0x1.cp-16384, false, true, + 0x1.cp-16384, false, true, + 0x1.cp-16384, false, true, + 0x1.c000000000000000000000000004p-16384, false, true), };