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Sun, 20 Oct 2024 08:54:10 -0700 (PDT) X-Google-Smtp-Source: AGHT+IHYWBXyX46VYVA7kzUy0SkLvAFBfoAYjzVeL4dAj59yP8wZStDJT74AzOHqBwAPxGhzbkSWuw== X-Received: by 2002:adf:f6d2:0:b0:37c:d299:b5f0 with SMTP id ffacd0b85a97d-37eab6ec6camr5327412f8f.59.1729439650386; Sun, 20 Oct 2024 08:54:10 -0700 (PDT) From: Paolo Bonzini To: qemu-devel@nongnu.org Cc: richard.henderson@linaro.org Subject: [PATCH 13/14] target/i386: use higher-precision arithmetic to compute CF Date: Sun, 20 Oct 2024 17:53:23 +0200 Message-ID: <20241020155324.35273-14-pbonzini@redhat.com> X-Mailer: git-send-email 2.46.2 In-Reply-To: <20241020155324.35273-1-pbonzini@redhat.com> References: <20241020155324.35273-1-pbonzini@redhat.com> 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=170.10.133.124; envelope-from=pbonzini@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -25 X-Spam_score: -2.6 X-Spam_bar: -- X-Spam_report: (-2.6 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.527, 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, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham 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 @redhat.com) X-ZM-MESSAGEID: 1729439696556116600 Content-Type: text/plain; charset="utf-8" If the operands of the arithmetic instruction fit within a half-register, it's easiest to use a comparison instruction to compute the carry. ` Signed-off-by: Paolo Bonzini --- target/i386/tcg/cc_helper_template.h.inc | 37 ++++++++++++++++++++++++ 1 file changed, 37 insertions(+) diff --git a/target/i386/tcg/cc_helper_template.h.inc b/target/i386/tcg/cc_= helper_template.h.inc index 8af8b8539f9..f29a6dfb77c 100644 --- a/target/i386/tcg/cc_helper_template.h.inc +++ b/target/i386/tcg/cc_helper_template.h.inc @@ -22,12 +22,17 @@ #if DATA_BITS =3D=3D 8 #define SUFFIX b #define DATA_TYPE uint8_t +#define WIDER_TYPE uint32_t #elif DATA_BITS =3D=3D 16 #define SUFFIX w #define DATA_TYPE uint16_t +#define WIDER_TYPE uint32_t #elif DATA_BITS =3D=3D 32 #define SUFFIX l #define DATA_TYPE uint32_t +#if HOST_LONG_BITS <=3D 64 +#define WIDER_TYPE uint64_t +#endif #elif DATA_BITS =3D=3D 64 #define SUFFIX q #define DATA_TYPE uint64_t @@ -62,9 +67,18 @@ static uint32_t glue(compute_all_adc, SUFFIX)(DATA_TYPE = dst, DATA_TYPE src1, DATA_TYPE src3) { uint32_t cf, pf, af, zf, sf, of; + +#ifdef WIDER_TYPE + WIDER_TYPE src13 =3D (WIDER_TYPE) src1 + (WIDER_TYPE) src3; + DATA_TYPE src2 =3D dst - src13; + + cf =3D dst < src13; +#else DATA_TYPE src2 =3D dst - src1 - src3; =20 cf =3D (src3 ? dst <=3D src1 : dst < src1); +#endif + pf =3D compute_pf(dst); af =3D (dst ^ src1 ^ src2) & 0x10; zf =3D (dst =3D=3D 0) << 6; @@ -76,7 +90,13 @@ static uint32_t glue(compute_all_adc, SUFFIX)(DATA_TYPE = dst, DATA_TYPE src1, static int glue(compute_c_adc, SUFFIX)(DATA_TYPE dst, DATA_TYPE src1, DATA_TYPE src3) { +#ifdef WIDER_TYPE + WIDER_TYPE src13 =3D (WIDER_TYPE) src1 + (WIDER_TYPE) src3; + + return dst < src13; +#else return src3 ? dst <=3D src1 : dst < src1; +#endif } =20 static uint32_t glue(compute_all_sub, SUFFIX)(DATA_TYPE dst, DATA_TYPE src= 2) @@ -104,9 +124,18 @@ static uint32_t glue(compute_all_sbb, SUFFIX)(DATA_TYP= E dst, DATA_TYPE src2, DATA_TYPE src3) { uint32_t cf, pf, af, zf, sf, of; + +#ifdef WIDER_TYPE + WIDER_TYPE src23 =3D (WIDER_TYPE) src2 + (WIDER_TYPE) src3; + DATA_TYPE src1 =3D dst + src23; + + cf =3D src1 < src23; +#else DATA_TYPE src1 =3D dst + src2 + src3; =20 cf =3D (src3 ? src1 <=3D src2 : src1 < src2); +#endif + pf =3D compute_pf(dst); af =3D (dst ^ src1 ^ src2) & 0x10; zf =3D (dst =3D=3D 0) << 6; @@ -118,9 +147,16 @@ static uint32_t glue(compute_all_sbb, SUFFIX)(DATA_TYP= E dst, DATA_TYPE src2, static int glue(compute_c_sbb, SUFFIX)(DATA_TYPE dst, DATA_TYPE src2, DATA_TYPE src3) { +#ifdef WIDER_TYPE + WIDER_TYPE src23 =3D (WIDER_TYPE) src2 + (WIDER_TYPE) src3; + DATA_TYPE src1 =3D dst + src23; + + return src1 < src23; +#else DATA_TYPE src1 =3D dst + src2 + src3; =20 return (src3 ? src1 <=3D src2 : src1 < src2); +#endif } =20 static uint32_t glue(compute_all_logic, SUFFIX)(DATA_TYPE dst, DATA_TYPE s= rc1) @@ -258,3 +294,4 @@ static int glue(compute_c_blsi, SUFFIX)(DATA_TYPE dst, = DATA_TYPE src1) #undef DATA_TYPE #undef DATA_MASK #undef SUFFIX +#undef WIDER_TYPE --=20 2.46.2