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X-Received-From: 2a00:1450:4864:20::342 Subject: [Qemu-devel] [PATCH 19/42] target/arm: Convert VFP VMLS to decodetree 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: Richard Henderson Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" Convert the VFP VMLS instruction to decodetree. Signed-off-by: Peter Maydell Reviewed-by: Richard Henderson --- target/arm/translate-vfp.inc.c | 38 ++++++++++++++++++++++++++++++++++ target/arm/translate.c | 8 +------ target/arm/vfp.decode | 5 +++++ 3 files changed, 44 insertions(+), 7 deletions(-) diff --git a/target/arm/translate-vfp.inc.c b/target/arm/translate-vfp.inc.c index 4f922dc8405..00f64401dda 100644 --- a/target/arm/translate-vfp.inc.c +++ b/target/arm/translate-vfp.inc.c @@ -1303,3 +1303,41 @@ static bool trans_VMLA_dp(DisasContext *s, arg_VMLA_= sp *a) { return do_vfp_3op_dp(s, gen_VMLA_dp, a->vd, a->vn, a->vm, true); } + +static void gen_VMLS_sp(TCGv_i32 vd, TCGv_i32 vn, TCGv_i32 vm, TCGv_ptr fp= st) +{ + /* + * VMLS: vd =3D vd + -(vn * vm) + * Note that order of inputs to the add matters for NaNs. + */ + TCGv_i32 tmp =3D tcg_temp_new_i32(); + + gen_helper_vfp_muls(tmp, vn, vm, fpst); + gen_helper_vfp_negs(tmp, tmp); + gen_helper_vfp_adds(vd, vd, tmp, fpst); + tcg_temp_free_i32(tmp); +} + +static bool trans_VMLS_sp(DisasContext *s, arg_VMLS_sp *a) +{ + return do_vfp_3op_sp(s, gen_VMLS_sp, a->vd, a->vn, a->vm, true); +} + +static void gen_VMLS_dp(TCGv_i64 vd, TCGv_i64 vn, TCGv_i64 vm, TCGv_ptr fp= st) +{ + /* + * VMLS: vd =3D vd + -(vn * vm) + * Note that order of inputs to the add matters for NaNs. + */ + TCGv_i64 tmp =3D tcg_temp_new_i64(); + + gen_helper_vfp_muld(tmp, vn, vm, fpst); + gen_helper_vfp_negd(tmp, tmp); + gen_helper_vfp_addd(vd, vd, tmp, fpst); + tcg_temp_free_i64(tmp); +} + +static bool trans_VMLS_dp(DisasContext *s, arg_VMLS_sp *a) +{ + return do_vfp_3op_dp(s, gen_VMLS_dp, a->vd, a->vn, a->vm, true); +} diff --git a/target/arm/translate.c b/target/arm/translate.c index 2fa516364f3..dc19d8fcab1 100644 --- a/target/arm/translate.c +++ b/target/arm/translate.c @@ -3134,7 +3134,7 @@ static int disas_vfp_insn(DisasContext *s, uint32_t i= nsn) rn =3D VFP_SREG_N(insn); =20 switch (op) { - case 0: + case 0 ... 1: /* Already handled by decodetree */ return 1; default: @@ -3320,12 +3320,6 @@ static int disas_vfp_insn(DisasContext *s, uint32_t = insn) for (;;) { /* Perform the calculation. */ switch (op) { - case 1: /* VMLS: fd + -(fn * fm) */ - gen_vfp_mul(dp); - gen_vfp_F1_neg(dp); - gen_mov_F0_vreg(dp, rd); - gen_vfp_add(dp); - break; case 2: /* VNMLS: -fd + (fn * fm) */ /* Note that it isn't valid to replace (-A + B) with (= B - A) * or similar plausible looking simplifications diff --git a/target/arm/vfp.decode b/target/arm/vfp.decode index 9530e17ae02..7bcf2260eec 100644 --- a/target/arm/vfp.decode +++ b/target/arm/vfp.decode @@ -102,3 +102,8 @@ VMLA_sp ---- 1110 0.00 .... .... 1010 .0.0 .... \ vm=3D%vm_sp vn=3D%vn_sp vd=3D%vd_sp VMLA_dp ---- 1110 0.00 .... .... 1011 .0.0 .... \ vm=3D%vm_dp vn=3D%vn_dp vd=3D%vd_dp + +VMLS_sp ---- 1110 0.00 .... .... 1010 .1.0 .... \ + vm=3D%vm_sp vn=3D%vn_sp vd=3D%vd_sp +VMLS_dp ---- 1110 0.00 .... .... 1011 .1.0 .... \ + vm=3D%vm_dp vn=3D%vn_dp vd=3D%vd_dp --=20 2.20.1