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[174.21.76.141]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-1f9ebbc72e9sm70843865ad.296.2024.06.24.22.08.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 24 Jun 2024 22:08:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1719292095; x=1719896895; darn=nongnu.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=/Pg6/3MNS2vx+BkKofM6RgZsGJ5t7KT/lobWOjzWfJo=; b=qjo/tohw2kgcn4zqsCgSb0Q+qmDoeH1H0z4kjLMW6QZ/6SQh7OBk/aFg1E5+S2wycL BZ/pFyxBEtwTF7itIBopr80LefytEyhIra5QcsFMqenX9hZaG1X6HqeKvWRLNYfOExq7 L8Xw8QhQC+BgZ9JyJFpdD1TCOKNqCv9ctj5MKskH0oiefNX7lbksKWoNUnXl6BoKnEYc WzC/M86jOzBC46cG+dP/xjiUgLkqDMNVtc+Fac+18K92brVCre9KxBvQcVrqNiWaattw S9C5LErSXHFo1FIuVDTVrqN6jL+fdmJxgWDPbfQcAoonPca/YjkxGUNHOR3OytPd7Doz zvVQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1719292095; x=1719896895; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=/Pg6/3MNS2vx+BkKofM6RgZsGJ5t7KT/lobWOjzWfJo=; b=BK3cDRQ/AjF37ArOABYjp5g3GcVeExrZM94kC3PleU1ve15tALsmdaV5rs6d8ReG89 athuO8JFkaAD51BUDH0zejx+AHxRRBc18BWOr7XE4myOYBpsckgs5lFYiADLFbeeX6Wh 7SUinpre8V+NAdNqAp2ZYPvJa1UuevnPdZ/rO0hx3/y6lRlfl2IZLLT6FGuBg8LnRKJf TSd2BVgIAdnLaI/wq1IUSs8dUyc6w3n4kz7jsFjUzxKGMMrg3Y40sRgR/l8bKn5AkKbH nNRYlmy9FagelDUZWWhyMvEtDStnVjrJlOKJpl44bcwGIxPGz0jYxMmWiP7FuiEkJZtJ 4Aew== X-Gm-Message-State: AOJu0YyFBn0BOb81jc8qf/JJcTw7cNMPpChdO0p9WGd1fau48hoQywjU 01cQprkfFop49oMf7MRSb1/+AXbKqTJ08qxSETEcNg7ycvTl2SJvfX5WHAzRqiPM/DwChGo/5iD 9 X-Google-Smtp-Source: AGHT+IE9rTGP39kRkZtz2CxjMld3ebebDoEJ/Q0QTg05TGza++uaSO5QeOMIpmatrDhcjUnt4U1XaQ== X-Received: by 2002:a17:902:cecc:b0:1f9:d99f:61ab with SMTP id d9443c01a7336-1fa1d685713mr71326665ad.62.1719292095275; Mon, 24 Jun 2024 22:08:15 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Cc: qemu-arm@nongnu.org, qemu-stable@nongnu.org Subject: [PATCH 03/13] target/arm: Fix FJCVTZS vs flush-to-zero Date: Mon, 24 Jun 2024 22:08:00 -0700 Message-Id: <20240625050810.1475643-4-richard.henderson@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240625050810.1475643-1-richard.henderson@linaro.org> References: <20240625050810.1475643-1-richard.henderson@linaro.org> MIME-Version: 1.0 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=2607:f8b0:4864:20::62a; envelope-from=richard.henderson@linaro.org; helo=mail-pl1-x62a.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @linaro.org) X-ZM-MESSAGEID: 1719292223040100003 Content-Type: text/plain; charset="utf-8" Input denormals cause the Javascript inexact bit (output to Z) to be set. Cc: qemu-stable@nongnu.org Fixes: 6c1f6f2733a ("target/arm: Implement ARMv8.3-JSConv") Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2375 Signed-off-by: Richard Henderson Reviewed-by: Peter Maydell --- target/arm/vfp_helper.c | 18 +++++++++--------- tests/tcg/aarch64/test-2375.c | 20 ++++++++++++++++++++ tests/tcg/aarch64/Makefile.target | 3 ++- 3 files changed, 31 insertions(+), 10 deletions(-) create mode 100644 tests/tcg/aarch64/test-2375.c diff --git a/target/arm/vfp_helper.c b/target/arm/vfp_helper.c index ce26b8a71a..50d7042fa9 100644 --- a/target/arm/vfp_helper.c +++ b/target/arm/vfp_helper.c @@ -1091,8 +1091,8 @@ const FloatRoundMode arm_rmode_to_sf_map[] =3D { uint64_t HELPER(fjcvtzs)(float64 value, void *vstatus) { float_status *status =3D vstatus; - uint32_t inexact, frac; - uint32_t e_old, e_new; + uint32_t frac, e_old, e_new; + bool inexact; =20 e_old =3D get_float_exception_flags(status); set_float_exception_flags(0, status); @@ -1100,13 +1100,13 @@ uint64_t HELPER(fjcvtzs)(float64 value, void *vstat= us) e_new =3D get_float_exception_flags(status); set_float_exception_flags(e_old | e_new, status); =20 - if (value =3D=3D float64_chs(float64_zero)) { - /* While not inexact for IEEE FP, -0.0 is inexact for JavaScript. = */ - inexact =3D 1; - } else { - /* Normal inexact or overflow or NaN */ - inexact =3D e_new & (float_flag_inexact | float_flag_invalid); - } + /* Normal inexact, denormal with flush-to-zero, or overflow or NaN */ + inexact =3D e_new & (float_flag_inexact | + float_flag_input_denormal | + float_flag_invalid); + + /* While not inexact for IEEE FP, -0.0 is inexact for JavaScript. */ + inexact |=3D value =3D=3D float64_chs(float64_zero); =20 /* Pack the result and the env->ZF representation of Z together. */ return deposit64(frac, 32, 32, inexact); diff --git a/tests/tcg/aarch64/test-2375.c b/tests/tcg/aarch64/test-2375.c new file mode 100644 index 0000000000..f83af8b3ea --- /dev/null +++ b/tests/tcg/aarch64/test-2375.c @@ -0,0 +1,20 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* See https://gitlab.com/qemu-project/qemu/-/issues/2375 */ + +#include + +int main() +{ + int r, z; + + asm("msr fpcr, %2\n\t" + "fjcvtzs %w0, %d3\n\t" + "cset %1, eq" + : "=3Dr"(r), "=3Dr"(z) + : "r"(0x01000000L), /* FZ =3D 1 */ + "w"(0xfcff00L)); /* denormal */ + + assert(r =3D=3D 0); + assert(z =3D=3D 0); + return 0; +} diff --git a/tests/tcg/aarch64/Makefile.target b/tests/tcg/aarch64/Makefile= .target index 70d728ae9a..4ecbca6a41 100644 --- a/tests/tcg/aarch64/Makefile.target +++ b/tests/tcg/aarch64/Makefile.target @@ -41,8 +41,9 @@ endif =20 # Pauth Tests ifneq ($(CROSS_CC_HAS_ARMV8_3),) -AARCH64_TESTS +=3D pauth-1 pauth-2 pauth-4 pauth-5 +AARCH64_TESTS +=3D pauth-1 pauth-2 pauth-4 pauth-5 test-2375 pauth-%: CFLAGS +=3D -march=3Darmv8.3-a +test-2375: CFLAGS +=3D -march=3Darmv8.3-a run-pauth-1: QEMU_OPTS +=3D -cpu max run-pauth-2: QEMU_OPTS +=3D -cpu max # Choose a cpu with FEAT_Pauth but without FEAT_FPAC for pauth-[45]. --=20 2.34.1