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Mon, 03 Aug 2026 16:55:13 -0700 (PDT) Received: from localhost ([2600:1702:7a90:6f9f:8bc4:8aec:108d:7a04]) by smtp.gmail.com with ESMTPSA id 00721157ae682-81fcd1240d6sm63130177b3.40.2026.08.03.16.55.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 03 Aug 2026 16:55:12 -0700 (PDT) From: Matt Turner To: libc-alpha@sourceware.org Cc: Joseph Myers , Adhemerval Zanella , Magnus Lindholm Subject: [PATCH 1/4] alpha: add the denormal trap enable bit to FE_NOMASK_ENV Date: Mon, 3 Aug 2026 19:55:06 -0400 Message-ID: <20260803235509.3532030-2-mattst88@gmail.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260803235509.3532030-1-mattst88@gmail.com> References: <20260803235509.3532030-1-mattst88@gmail.com> MIME-Version: 1.0 X-Spam-Status: No, score=-10.3 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, FREEMAIL_ENVFROM_END_DIGIT, FREEMAIL_FROM, GIT_PATCH_0, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP shortcircuit=no autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on 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 FE_NOMASK_ENV is the floating-point environment in which no exception is masked, so it must enable every exception that FE_ALL_EXCEPT covers. On Alpha that includes the GNU extension FE_DENORMAL, whose SWCR trap enable bit is IEEE_TRAP_ENABLE_DNO (bit 6). The constant only set bits 1 through 5 (INV, DZE, OVF, UNF and INE), so after fesetenv (FE_NOMASK_ENV) a subsequent fegetexcept () returned 0x3e0000 rather than FE_ALL_EXCEPT (0x7e0000), and denormal exceptions stayed masked. Set bit 6 as well. Fixes math/test-fenv-return on alpha. Reviewed-by: Adhemerval Zanella --- sysdeps/alpha/fpu/bits/fenv.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git ./sysdeps/alpha/fpu/bits/fenv.h ./sysdeps/alpha/fpu/bits/fenv.h index b1135f1f0a..530f298914 100644 --- ./sysdeps/alpha/fpu/bits/fenv.h +++ ./sysdeps/alpha/fpu/bits/fenv.h @@ -121,7 +121,7 @@ typedef unsigned long int fenv_t; #ifdef __USE_GNU /* Floating-point environment where none of the exceptions are masked. */ -# define FE_NOMASK_ENV ((const fenv_t *) 0x880000000000003eUL) +# define FE_NOMASK_ENV ((const fenv_t *) 0x880000000000007eUL) /* Floating-point environment with (processor-dependent) non-IEEE floating point. In this case, mapping denormals to zero. */