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author | Stephen Long <steplong@quicinc.com> | 2021-05-24 18:03:41 -0700 |
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committer | Peter Maydell <peter.maydell@linaro.org> | 2021-05-25 16:01:44 +0100 |
commit | 631be02e29ad47eae4ad23c55e4e5631146151d9 (patch) | |
tree | 9c01cce5fbc6f6d40cad502cee41097413a6b743 | |
parent | 9536527731d099fb4a2dea1b83a1d915738fa172 (diff) | |
download | qemu-631be02e29ad47eae4ad23c55e4e5631146151d9.zip qemu-631be02e29ad47eae4ad23c55e4e5631146151d9.tar.gz qemu-631be02e29ad47eae4ad23c55e4e5631146151d9.tar.bz2 |
target/arm: Implement SVE2 FLOGB
Signed-off-by: Stephen Long <steplong@quicinc.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20210525010358.152808-76-richard.henderson@linaro.org
Message-Id: <20200430191405.21641-1-steplong@quicinc.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
-rw-r--r-- | target/arm/helper-sve.h | 4 | ||||
-rw-r--r-- | target/arm/sve.decode | 3 | ||||
-rw-r--r-- | target/arm/sve_helper.c | 88 | ||||
-rw-r--r-- | target/arm/translate-sve.c | 24 |
4 files changed, 119 insertions, 0 deletions
diff --git a/target/arm/helper-sve.h b/target/arm/helper-sve.h index be4b17f..342bb83 100644 --- a/target/arm/helper-sve.h +++ b/target/arm/helper-sve.h @@ -2754,3 +2754,7 @@ DEF_HELPER_FLAGS_5(sve2_fcvtlt_hs, TCG_CALL_NO_RWG, void, ptr, ptr, ptr, ptr, i32) DEF_HELPER_FLAGS_5(sve2_fcvtlt_sd, TCG_CALL_NO_RWG, void, ptr, ptr, ptr, ptr, i32) + +DEF_HELPER_FLAGS_5(flogb_h, TCG_CALL_NO_RWG, void, ptr, ptr, ptr, ptr, i32) +DEF_HELPER_FLAGS_5(flogb_s, TCG_CALL_NO_RWG, void, ptr, ptr, ptr, ptr, i32) +DEF_HELPER_FLAGS_5(flogb_d, TCG_CALL_NO_RWG, void, ptr, ptr, ptr, ptr, i32) diff --git a/target/arm/sve.decode b/target/arm/sve.decode index 5dcc797..5a1ccec 100644 --- a/target/arm/sve.decode +++ b/target/arm/sve.decode @@ -1588,3 +1588,6 @@ FCVTNT_sh 01100100 10 0010 00 101 ... ..... ..... @rd_pg_rn_e0 FCVTLT_hs 01100100 10 0010 01 101 ... ..... ..... @rd_pg_rn_e0 FCVTNT_ds 01100100 11 0010 10 101 ... ..... ..... @rd_pg_rn_e0 FCVTLT_sd 01100100 11 0010 11 101 ... ..... ..... @rd_pg_rn_e0 + +### SVE2 floating-point convert to integer +FLOGB 01100101 00 011 esz:2 0101 pg:3 rn:5 rd:5 &rpr_esz diff --git a/target/arm/sve_helper.c b/target/arm/sve_helper.c index 8882393..a051854 100644 --- a/target/arm/sve_helper.c +++ b/target/arm/sve_helper.c @@ -4729,6 +4729,94 @@ DO_ZPZ_FP(sve_ucvt_dh, uint64_t, , uint64_to_float16) DO_ZPZ_FP(sve_ucvt_ds, uint64_t, , uint64_to_float32) DO_ZPZ_FP(sve_ucvt_dd, uint64_t, , uint64_to_float64) +static int16_t do_float16_logb_as_int(float16 a, float_status *s) +{ + /* Extract frac to the top of the uint32_t. */ + uint32_t frac = (uint32_t)a << (16 + 6); + int16_t exp = extract32(a, 10, 5); + + if (unlikely(exp == 0)) { + if (frac != 0) { + if (!get_flush_inputs_to_zero(s)) { + /* denormal: bias - fractional_zeros */ + return -15 - clz32(frac); + } + /* flush to zero */ + float_raise(float_flag_input_denormal, s); + } + } else if (unlikely(exp == 0x1f)) { + if (frac == 0) { + return INT16_MAX; /* infinity */ + } + } else { + /* normal: exp - bias */ + return exp - 15; + } + /* nan or zero */ + float_raise(float_flag_invalid, s); + return INT16_MIN; +} + +static int32_t do_float32_logb_as_int(float32 a, float_status *s) +{ + /* Extract frac to the top of the uint32_t. */ + uint32_t frac = a << 9; + int32_t exp = extract32(a, 23, 8); + + if (unlikely(exp == 0)) { + if (frac != 0) { + if (!get_flush_inputs_to_zero(s)) { + /* denormal: bias - fractional_zeros */ + return -127 - clz32(frac); + } + /* flush to zero */ + float_raise(float_flag_input_denormal, s); + } + } else if (unlikely(exp == 0xff)) { + if (frac == 0) { + return INT32_MAX; /* infinity */ + } + } else { + /* normal: exp - bias */ + return exp - 127; + } + /* nan or zero */ + float_raise(float_flag_invalid, s); + return INT32_MIN; +} + +static int64_t do_float64_logb_as_int(float64 a, float_status *s) +{ + /* Extract frac to the top of the uint64_t. */ + uint64_t frac = a << 12; + int64_t exp = extract64(a, 52, 11); + + if (unlikely(exp == 0)) { + if (frac != 0) { + if (!get_flush_inputs_to_zero(s)) { + /* denormal: bias - fractional_zeros */ + return -1023 - clz64(frac); + } + /* flush to zero */ + float_raise(float_flag_input_denormal, s); + } + } else if (unlikely(exp == 0x7ff)) { + if (frac == 0) { + return INT64_MAX; /* infinity */ + } + } else { + /* normal: exp - bias */ + return exp - 1023; + } + /* nan or zero */ + float_raise(float_flag_invalid, s); + return INT64_MIN; +} + +DO_ZPZ_FP(flogb_h, float16, H1_2, do_float16_logb_as_int) +DO_ZPZ_FP(flogb_s, float32, H1_4, do_float32_logb_as_int) +DO_ZPZ_FP(flogb_d, float64, , do_float64_logb_as_int) + #undef DO_ZPZ_FP static void do_fmla_zpzzz_h(void *vd, void *vn, void *vm, void *va, void *vg, diff --git a/target/arm/translate-sve.c b/target/arm/translate-sve.c index 0a2718c..3ea51a7 100644 --- a/target/arm/translate-sve.c +++ b/target/arm/translate-sve.c @@ -8307,3 +8307,27 @@ static bool trans_FCVTXNT_ds(DisasContext *s, arg_rpr_esz *a) } return do_frint_mode(s, a, float_round_to_odd, gen_helper_sve2_fcvtnt_ds); } + +static bool trans_FLOGB(DisasContext *s, arg_rpr_esz *a) +{ + static gen_helper_gvec_3_ptr * const fns[] = { + NULL, gen_helper_flogb_h, + gen_helper_flogb_s, gen_helper_flogb_d + }; + + if (!dc_isar_feature(aa64_sve2, s) || fns[a->esz] == NULL) { + return false; + } + if (sve_access_check(s)) { + TCGv_ptr status = + fpstatus_ptr(a->esz == MO_16 ? FPST_FPCR_F16 : FPST_FPCR); + unsigned vsz = vec_full_reg_size(s); + + tcg_gen_gvec_3_ptr(vec_full_reg_offset(s, a->rd), + vec_full_reg_offset(s, a->rn), + pred_full_reg_offset(s, a->pg), + status, vsz, vsz, 0, fns[a->esz]); + tcg_temp_free_ptr(status); + } + return true; +} |