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bh=b/f+g1sL79bkK2ZcWOndgrRFIJ4GVzXBxsrToUJIrww=; b=g8Hmfn43bLAarDbAHKT+kk48fj7Up9VeL8rrcnCRWNdFfjH9xPvTqli+hamdknmJKVcuw3 76VuqvFkNdCTY029Jy6kaqZ4ocquz8x8oU9UgjOGk1N2/1Ny4DxLT78u9W4m5+MGWUMGF8 dHh4qk7OXb9Y1IA7/+j3qxMwrwe+UtQ= X-MC-Unique: xbfjNjHyNnm3LLxNatbclw-1 From: Paolo Bonzini To: qemu-devel@nongnu.org Subject: [PULL 16/31] softfloat: fix floatx80 remainder pseudo-denormal check for zero Date: Wed, 24 Jun 2020 06:50:33 -0400 Message-Id: <20200624105048.375353-16-pbonzini@redhat.com> In-Reply-To: <20200624104917.375143-1-pbonzini@redhat.com> References: <20200624104917.375143-1-pbonzini@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=205.139.110.120; envelope-from=pbonzini@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/06/24 03:27:53 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=_AUTOLEARN X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Richard Henderson , Joseph Myers Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" From: Joseph Myers The floatx80 remainder implementation ignores the high bit of the significand when checking whether an operand (numerator) with zero exponent is zero. This means it mishandles a pseudo-denormal representation of 0x1p-16382L by treating it as zero. Fix this by checking the whole significand instead. Signed-off-by: Joseph Myers Reviewed-by: Richard Henderson Message-Id: Signed-off-by: Paolo Bonzini --- fpu/softfloat.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fpu/softfloat.c b/fpu/softfloat.c index b7dcf4d6c3..f164b5c0ad 100644 --- a/fpu/softfloat.c +++ b/fpu/softfloat.c @@ -5741,7 +5741,7 @@ floatx80 floatx80_modrem(floatx80 a, floatx80 b, bool= mod, normalizeFloatx80Subnormal( bSig, &bExp, &bSig ); } if ( aExp =3D=3D 0 ) { - if ( (uint64_t) ( aSig0<<1 ) =3D=3D 0 ) return a; + if ( aSig0 =3D=3D 0 ) return a; normalizeFloatx80Subnormal( aSig0, &aExp, &aSig0 ); } bSig |=3D UINT64_C(0x8000000000000000); --=20 2.26.2