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(unknown [IPv6:240e:358:11be:c900:dc73:854d:832e:5]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-384) server-digest SHA384) (Client did not present a certificate) (Authenticated sender: xry111@xry111.site) by xry111.site (Postfix) with ESMTPSA id 1B8FE66A81; Thu, 29 Feb 2024 02:10:34 -0500 (EST) From: Xi Ruoyao To: gcc-patches@gcc.gnu.org Cc: Jeff Law , chenglulu , i@xen0n.name, xuchenghua@loongson.cn, YunQiang Su , Xi Ruoyao Subject: [PATCH v2] testsuite: Add a test case for negating FP vectors containing zeros Date: Thu, 29 Feb 2024 15:09:17 +0800 Message-ID: <20240229071024.57153-1-xry111@xry111.site> X-Mailer: git-send-email 2.44.0 MIME-Version: 1.0 X-Spam-Status: No, score=-8.4 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, LIKELY_SPAM_FROM, SPF_HELO_PASS, 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 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: , Errors-To: gcc-patches-bounces+incoming=patchwork.ozlabs.org@gcc.gnu.org Recently I've fixed two wrong FP vector negate implementation which caused wrong sign bits in zeros in targets (r14-8786 and r14-8801). To prevent a similar issue from happening again, add a test case. Tested on x86_64 (with SSE2, AVX, AVX2, and AVX512F), AArch64, MIPS (with MSA), LoongArch (with LSX and LASX). gcc/testsuite: * gcc.dg/vect/vect-neg-zero.c: New test. --- v1->v2: Remove { dg-do run } which was likely triggering a SIGILL on Linaro ARM CI. Ok for trunk? gcc/testsuite/gcc.dg/vect/vect-neg-zero.c | 38 +++++++++++++++++++++++ 1 file changed, 38 insertions(+) create mode 100644 gcc/testsuite/gcc.dg/vect/vect-neg-zero.c diff --git a/gcc/testsuite/gcc.dg/vect/vect-neg-zero.c b/gcc/testsuite/gcc.dg/vect/vect-neg-zero.c new file mode 100644 index 00000000000..6af4a02c517 --- /dev/null +++ b/gcc/testsuite/gcc.dg/vect/vect-neg-zero.c @@ -0,0 +1,38 @@ +/* { dg-add-options ieee } */ +/* { dg-additional-options "-fsigned-zeros" } */ + +double x[4] = {-0.0, 0.0, -0.0, 0.0}; +float y[8] = {-0.0, 0.0, -0.0, 0.0, -0.0, -0.0, 0.0, 0.0}; + +static __attribute__ ((always_inline)) inline void +test (int factor) +{ + double a[4]; + float b[8]; + + asm ("" ::: "memory"); + + for (int i = 0; i < 2 * factor; i++) + a[i] = -x[i]; + + for (int i = 0; i < 4 * factor; i++) + b[i] = -y[i]; + +#pragma GCC novector + for (int i = 0; i < 2 * factor; i++) + if (__builtin_signbit (a[i]) == __builtin_signbit (x[i])) + __builtin_abort (); + +#pragma GCC novector + for (int i = 0; i < 4 * factor; i++) + if (__builtin_signbit (b[i]) == __builtin_signbit (y[i])) + __builtin_abort (); +} + +int +main (void) +{ + test (1); + test (2); + return 0; +}