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X-Received-From: 2607:f8b0:4003:c06::22c Subject: [Qemu-devel] [PATCH 72/99] target/arm: Implement vector shifted FCVT for fp16 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: Peter Maydell , Richard Henderson , qemu-stable@nongnu.org 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" From: Richard Henderson While we have some of the scalar paths for FCVT for fp16, we failed to decode the fp16 version of these instructions. Cc: qemu-stable@nongnu.org Signed-off-by: Richard Henderson Message-id: 20180502221552.3873-3-richard.henderson@linaro.org Reviewed-by: Peter Maydell Signed-off-by: Peter Maydell (cherry picked from commit d0ba8e74acd299b092786ffc30b306638d395a9e) Signed-off-by: Michael Roth --- target/arm/translate-a64.c | 63 +++++++++++++++++++++++++++----------- 1 file changed, 45 insertions(+), 18 deletions(-) diff --git a/target/arm/translate-a64.c b/target/arm/translate-a64.c index f0fa6045e4..61735dc185 100644 --- a/target/arm/translate-a64.c +++ b/target/arm/translate-a64.c @@ -7202,19 +7202,28 @@ static void handle_simd_shift_fpint_conv(DisasConte= xt *s, bool is_scalar, bool is_q, bool is_u, int immh, int immb, int rn, int r= d) { - bool is_double =3D extract32(immh, 3, 1); int immhb =3D immh << 3 | immb; - int fracbits =3D (is_double ? 128 : 64) - immhb; - int pass; + int pass, size, fracbits; TCGv_ptr tcg_fpstatus; TCGv_i32 tcg_rmode, tcg_shift; =20 - if (!extract32(immh, 2, 2)) { - unallocated_encoding(s); - return; - } - - if (!is_scalar && !is_q && is_double) { + if (immh & 0x8) { + size =3D MO_64; + if (!is_scalar && !is_q) { + unallocated_encoding(s); + return; + } + } else if (immh & 0x4) { + size =3D MO_32; + } else if (immh & 0x2) { + size =3D MO_16; + if (!arm_dc_feature(s, ARM_FEATURE_V8_FP16)) { + unallocated_encoding(s); + return; + } + } else { + /* Should have split out AdvSIMD modified immediate earlier. */ + assert(immh =3D=3D 1); unallocated_encoding(s); return; } @@ -7226,11 +7235,12 @@ static void handle_simd_shift_fpint_conv(DisasConte= xt *s, bool is_scalar, assert(!(is_scalar && is_q)); =20 tcg_rmode =3D tcg_const_i32(arm_rmode_to_sf(FPROUNDING_ZERO)); - tcg_fpstatus =3D get_fpstatus_ptr(false); + tcg_fpstatus =3D get_fpstatus_ptr(size =3D=3D MO_16); gen_helper_set_rmode(tcg_rmode, tcg_rmode, tcg_fpstatus); + fracbits =3D (16 << size) - immhb; tcg_shift =3D tcg_const_i32(fracbits); =20 - if (is_double) { + if (size =3D=3D MO_64) { int maxpass =3D is_scalar ? 1 : 2; =20 for (pass =3D 0; pass < maxpass; pass++) { @@ -7247,20 +7257,37 @@ static void handle_simd_shift_fpint_conv(DisasConte= xt *s, bool is_scalar, } clear_vec_high(s, is_q, rd); } else { - int maxpass =3D is_scalar ? 1 : is_q ? 4 : 2; - for (pass =3D 0; pass < maxpass; pass++) { - TCGv_i32 tcg_op =3D tcg_temp_new_i32(); + void (*fn)(TCGv_i32, TCGv_i32, TCGv_i32, TCGv_ptr); + int maxpass =3D is_scalar ? 1 : ((8 << is_q) >> size); =20 - read_vec_element_i32(s, tcg_op, rn, pass, MO_32); + switch (size) { + case MO_16: + if (is_u) { + fn =3D gen_helper_vfp_toulh; + } else { + fn =3D gen_helper_vfp_toslh; + } + break; + case MO_32: if (is_u) { - gen_helper_vfp_touls(tcg_op, tcg_op, tcg_shift, tcg_fpstat= us); + fn =3D gen_helper_vfp_touls; } else { - gen_helper_vfp_tosls(tcg_op, tcg_op, tcg_shift, tcg_fpstat= us); + fn =3D gen_helper_vfp_tosls; } + break; + default: + g_assert_not_reached(); + } + + for (pass =3D 0; pass < maxpass; pass++) { + TCGv_i32 tcg_op =3D tcg_temp_new_i32(); + + read_vec_element_i32(s, tcg_op, rn, pass, size); + fn(tcg_op, tcg_op, tcg_shift, tcg_fpstatus); if (is_scalar) { write_fp_sreg(s, rd, tcg_op); } else { - write_vec_element_i32(s, tcg_op, rd, pass, MO_32); + write_vec_element_i32(s, tcg_op, rd, pass, size); } tcg_temp_free_i32(tcg_op); } --=20 2.17.1