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X-Received-From: 2607:f8b0:400d:c09::241 Subject: [Qemu-devel] [PATCH v3 26/30] target/sh4: Implement fsrra X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: aurelien@aurel32.net Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZohoMail: RDKM_2 RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Signed-off-by: Richard Henderson --- V2: Fix argument types in helper.h --- target/sh4/helper.h | 1 + target/sh4/op_helper.c | 16 ++++++++++++++++ target/sh4/translate.c | 2 ++ 3 files changed, 19 insertions(+) diff --git a/target/sh4/helper.h b/target/sh4/helper.h index 6c6fa04..1e768fc 100644 --- a/target/sh4/helper.h +++ b/target/sh4/helper.h @@ -37,6 +37,7 @@ DEF_HELPER_FLAGS_3(fsub_FT, TCG_CALL_NO_WG, f32, env, f32= , f32) DEF_HELPER_FLAGS_3(fsub_DT, TCG_CALL_NO_WG, f64, env, f64, f64) DEF_HELPER_FLAGS_2(fsqrt_FT, TCG_CALL_NO_WG, f32, env, f32) DEF_HELPER_FLAGS_2(fsqrt_DT, TCG_CALL_NO_WG, f64, env, f64) +DEF_HELPER_FLAGS_2(fsrra_FT, TCG_CALL_NO_WG, f32, env, f32) DEF_HELPER_FLAGS_2(ftrc_FT, TCG_CALL_NO_WG, i32, env, f32) DEF_HELPER_FLAGS_2(ftrc_DT, TCG_CALL_NO_WG, i32, env, f64) DEF_HELPER_3(fipr, void, env, i32, i32) diff --git a/target/sh4/op_helper.c b/target/sh4/op_helper.c index 8513f38..d798f23 100644 --- a/target/sh4/op_helper.c +++ b/target/sh4/op_helper.c @@ -406,6 +406,22 @@ float64 helper_fsqrt_DT(CPUSH4State *env, float64 t0) return t0; } =20 +float32 helper_fsrra_FT(CPUSH4State *env, float32 t0) +{ + set_float_exception_flags(0, &env->fp_status); + /* "Approximate" 1/sqrt(x) via actual computation. */ + t0 =3D float32_sqrt(t0, &env->fp_status); + t0 =3D float32_div(float32_one, t0, &env->fp_status); + /* Since this is supposed to be an approximation, an imprecision + exception is required. One supposes this also follows the usual + IEEE rule that other exceptions take precidence. */ + if (get_float_exception_flags(&env->fp_status) =3D=3D 0) { + set_float_exception_flags(float_flag_inexact, &env->fp_status); + } + update_fpscr(env, GETPC()); + return t0; +} + float32 helper_fsub_FT(CPUSH4State *env, float32 t0, float32 t1) { set_float_exception_flags(0, &env->fp_status); diff --git a/target/sh4/translate.c b/target/sh4/translate.c index a5d07a0..12d5ed7 100644 --- a/target/sh4/translate.c +++ b/target/sh4/translate.c @@ -1741,6 +1741,8 @@ static void _decode_opc(DisasContext * ctx) return; case 0xf07d: /* fsrra FRn */ CHECK_FPU_ENABLED + CHECK_FPSCR_PR_0 + gen_helper_fsrra_FT(FREG(B11_8), cpu_env, FREG(B11_8)); break; case 0xf08d: /* fldi0 FRn - FPSCR: R[PR] */ CHECK_FPU_ENABLED --=20 2.9.4