From bbd8dd5e45b831ef3fda585cf80d08f45cdaba95 Mon Sep 17 00:00:00 2001 From: "Lucas Mateus Castro (alqotel)" Date: Wed, 19 Oct 2022 09:50:40 -0300 Subject: [PATCH] target/ppc: Use gvec to decode XVTSTDC[DS]P Used gvec to translate XVTSTDCSP and XVTSTDCDP. xvtstdcsp: rept loop imm master version prev version current version 25 4000 0 0,206200 0,040730 (-80.2%) 0,040740 (-80.2%) 25 4000 1 0,205120 0,053650 (-73.8%) 0,053510 (-73.9%) 25 4000 3 0,206160 0,058630 (-71.6%) 0,058570 (-71.6%) 25 4000 51 0,217110 0,191490 (-11.8%) 0,192320 (-11.4%) 25 4000 127 0,206160 0,191490 (-7.1%) 0,192640 (-6.6%) 8000 12 0 1,234719 0,418833 (-66.1%) 0,386365 (-68.7%) 8000 12 1 1,232417 1,435979 (+16.5%) 1,462792 (+18.7%) 8000 12 3 1,232760 1,766073 (+43.3%) 1,743990 (+41.5%) 8000 12 51 1,239281 1,319562 (+6.5%) 1,423479 (+14.9%) 8000 12 127 1,231708 1,315760 (+6.8%) 1,426667 (+15.8%) xvtstdcdp: rept loop imm master version prev version current version 25 4000 0 0,159930 0,040830 (-74.5%) 0,040610 (-74.6%) 25 4000 1 0,160640 0,053670 (-66.6%) 0,053480 (-66.7%) 25 4000 3 0,160020 0,063030 (-60.6%) 0,062960 (-60.7%) 25 4000 51 0,160410 0,128620 (-19.8%) 0,127470 (-20.5%) 25 4000 127 0,160330 0,127670 (-20.4%) 0,128690 (-19.7%) 8000 12 0 1,190365 0,422146 (-64.5%) 0,388417 (-67.4%) 8000 12 1 1,191292 1,445312 (+21.3%) 1,428698 (+19.9%) 8000 12 3 1,188687 1,980656 (+66.6%) 1,975354 (+66.2%) 8000 12 51 1,191250 1,264500 (+6.1%) 1,355083 (+13.8%) 8000 12 127 1,197313 1,266729 (+5.8%) 1,349156 (+12.7%) Overall, these instructions are the hardest ones to measure performance as the gvec implementation is affected by the immediate. Above there are 5 different scenarios when it comes to immediate and 2 when it comes to rept/loop combination. The immediates scenarios are: all bits are 0 therefore the target register should just be changed to 0, with 1 bit set, with 2 bits set in a combination the new implementation can deal with using gvec, 4 bits set and the new implementation can't deal with it using gvec and all bits set. The rept/loop scenarios are high loop and low rept (so it should spend more time executing it than translating it) and high rept low loop (so it should spend more time translating it than executing this code). These comparisons are between the upstream version, a previous similar implementation and a one with a cleaner code(this one). For a comparison with o previous different implementation: <20221010191356.83659-13-lucas.araujo@eldorado.org.br> Signed-off-by: Lucas Mateus Castro (alqotel) Reviewed-by: Richard Henderson Message-Id: <20221019125040.48028-13-lucas.araujo@eldorado.org.br> Signed-off-by: Daniel Henrique Barboza --- target/ppc/translate/vsx-impl.c.inc | 167 +++++++++++++++++++++++++++++++++--- 1 file changed, 157 insertions(+), 10 deletions(-) diff --git a/target/ppc/translate/vsx-impl.c.inc b/target/ppc/translate/vsx-impl.c.inc index af410cbf1b..4deb29ee42 100644 --- a/target/ppc/translate/vsx-impl.c.inc +++ b/target/ppc/translate/vsx-impl.c.inc @@ -632,6 +632,8 @@ static void gen_mtvsrws(DisasContext *ctx) #define SGN_MASK_SP 0x8000000080000000ull #define EXP_MASK_DP 0x7FF0000000000000ull #define EXP_MASK_SP 0x7F8000007F800000ull +#define FRC_MASK_DP (~(SGN_MASK_DP | EXP_MASK_DP)) +#define FRC_MASK_SP (~(SGN_MASK_SP | EXP_MASK_SP)) #define VSX_SCALAR_MOVE(name, op, sgn_mask) \ static void glue(gen_, name)(DisasContext *ctx) \ @@ -1112,23 +1114,168 @@ GEN_VSX_HELPER_X2(xscvhpdp, 0x16, 0x15, 0x10, PPC2_ISA300) GEN_VSX_HELPER_R2(xscvsdqp, 0x04, 0x1A, 0x0A, PPC2_ISA300) GEN_VSX_HELPER_X2(xscvspdp, 0x12, 0x14, 0, PPC2_VSX) +/* test if +Inf */ +static void gen_is_pos_inf(unsigned vece, TCGv_vec t, TCGv_vec b, int64_t v) +{ + uint64_t exp_msk = (vece == MO_32) ? (uint32_t)EXP_MASK_SP : EXP_MASK_DP; + tcg_gen_cmp_vec(TCG_COND_EQ, vece, t, b, + tcg_constant_vec_matching(t, vece, exp_msk)); +} + +/* test if -Inf */ +static void gen_is_neg_inf(unsigned vece, TCGv_vec t, TCGv_vec b, int64_t v) +{ + uint64_t exp_msk = (vece == MO_32) ? (uint32_t)EXP_MASK_SP : EXP_MASK_DP; + uint64_t sgn_msk = (vece == MO_32) ? (uint32_t)SGN_MASK_SP : SGN_MASK_DP; + tcg_gen_cmp_vec(TCG_COND_EQ, vece, t, b, + tcg_constant_vec_matching(t, vece, sgn_msk | exp_msk)); +} + +/* test if +Inf or -Inf */ +static void gen_is_any_inf(unsigned vece, TCGv_vec t, TCGv_vec b, int64_t v) +{ + uint64_t exp_msk = (vece == MO_32) ? (uint32_t)EXP_MASK_SP : EXP_MASK_DP; + uint64_t sgn_msk = (vece == MO_32) ? (uint32_t)SGN_MASK_SP : SGN_MASK_DP; + tcg_gen_andc_vec(vece, b, b, tcg_constant_vec_matching(t, vece, sgn_msk)); + tcg_gen_cmp_vec(TCG_COND_EQ, vece, t, b, + tcg_constant_vec_matching(t, vece, exp_msk)); +} + +/* test if +0 */ +static void gen_is_pos_zero(unsigned vece, TCGv_vec t, TCGv_vec b, int64_t v) +{ + tcg_gen_cmp_vec(TCG_COND_EQ, vece, t, b, + tcg_constant_vec_matching(t, vece, 0)); +} + +/* test if -0 */ +static void gen_is_neg_zero(unsigned vece, TCGv_vec t, TCGv_vec b, int64_t v) +{ + uint64_t sgn_msk = (vece == MO_32) ? (uint32_t)SGN_MASK_SP : SGN_MASK_DP; + tcg_gen_cmp_vec(TCG_COND_EQ, vece, t, b, + tcg_constant_vec_matching(t, vece, sgn_msk)); +} + +/* test if +0 or -0 */ +static void gen_is_any_zero(unsigned vece, TCGv_vec t, TCGv_vec b, int64_t v) +{ + uint64_t sgn_msk = (vece == MO_32) ? (uint32_t)SGN_MASK_SP : SGN_MASK_DP; + tcg_gen_andc_vec(vece, b, b, tcg_constant_vec_matching(t, vece, sgn_msk)); + tcg_gen_cmp_vec(TCG_COND_EQ, vece, t, b, + tcg_constant_vec_matching(t, vece, 0)); +} + +/* test if +Denormal */ +static void gen_is_pos_denormal(unsigned vece, TCGv_vec t, + TCGv_vec b, int64_t v) +{ + uint64_t frc_msk = (vece == MO_32) ? (uint32_t)FRC_MASK_SP : FRC_MASK_DP; + tcg_gen_cmp_vec(TCG_COND_LEU, vece, t, b, + tcg_constant_vec_matching(t, vece, frc_msk)); + tcg_gen_cmp_vec(TCG_COND_NE, vece, b, b, + tcg_constant_vec_matching(t, vece, 0)); + tcg_gen_and_vec(vece, t, t, b); +} + +/* test if -Denormal */ +static void gen_is_neg_denormal(unsigned vece, TCGv_vec t, + TCGv_vec b, int64_t v) +{ + uint64_t sgn_msk = (vece == MO_32) ? (uint32_t)SGN_MASK_SP : SGN_MASK_DP; + uint64_t frc_msk = (vece == MO_32) ? (uint32_t)FRC_MASK_SP : FRC_MASK_DP; + tcg_gen_cmp_vec(TCG_COND_LEU, vece, t, b, + tcg_constant_vec_matching(t, vece, sgn_msk | frc_msk)); + tcg_gen_cmp_vec(TCG_COND_GTU, vece, b, b, + tcg_constant_vec_matching(t, vece, sgn_msk)); + tcg_gen_and_vec(vece, t, t, b); +} + +/* test if +Denormal or -Denormal */ +static void gen_is_any_denormal(unsigned vece, TCGv_vec t, + TCGv_vec b, int64_t v) +{ + uint64_t sgn_msk = (vece == MO_32) ? (uint32_t)SGN_MASK_SP : SGN_MASK_DP; + uint64_t frc_msk = (vece == MO_32) ? (uint32_t)FRC_MASK_SP : FRC_MASK_DP; + tcg_gen_andc_vec(vece, b, b, tcg_constant_vec_matching(t, vece, sgn_msk)); + tcg_gen_cmp_vec(TCG_COND_LE, vece, t, b, + tcg_constant_vec_matching(t, vece, frc_msk)); + tcg_gen_cmp_vec(TCG_COND_NE, vece, b, b, + tcg_constant_vec_matching(t, vece, 0)); + tcg_gen_and_vec(vece, t, t, b); +} + +/* test if NaN */ +static void gen_is_nan(unsigned vece, TCGv_vec t, TCGv_vec b, int64_t v) +{ + uint64_t exp_msk = (vece == MO_32) ? (uint32_t)EXP_MASK_SP : EXP_MASK_DP; + uint64_t sgn_msk = (vece == MO_32) ? (uint32_t)SGN_MASK_SP : SGN_MASK_DP; + tcg_gen_and_vec(vece, b, b, tcg_constant_vec_matching(t, vece, ~sgn_msk)); + tcg_gen_cmp_vec(TCG_COND_GT, vece, t, b, + tcg_constant_vec_matching(t, vece, exp_msk)); +} + static bool do_xvtstdc(DisasContext *ctx, arg_XX2_uim *a, unsigned vece) { - static const GVecGen2i op[] = { - { - .fnoi = gen_helper_XVTSTDCSP, - .vece = MO_32 - }, - { - .fnoi = gen_helper_XVTSTDCDP, - .vece = MO_64 - }, + static const TCGOpcode vecop_list[] = { + INDEX_op_cmp_vec, 0 + }; + + GVecGen2i op = { + .fnoi = (vece == MO_32) ? gen_helper_XVTSTDCSP : gen_helper_XVTSTDCDP, + .vece = vece, + .opt_opc = vecop_list }; REQUIRE_VSX(ctx); + switch (a->uim) { + case 0: + set_cpu_vsr(a->xt, tcg_constant_i64(0), true); + set_cpu_vsr(a->xt, tcg_constant_i64(0), false); + return true; + case ((1 << 0) | (1 << 1)): + /* test if +Denormal or -Denormal */ + op.fniv = gen_is_any_denormal; + break; + case (1 << 0): + /* test if -Denormal */ + op.fniv = gen_is_neg_denormal; + break; + case (1 << 1): + /* test if +Denormal */ + op.fniv = gen_is_pos_denormal; + break; + case ((1 << 2) | (1 << 3)): + /* test if +0 or -0 */ + op.fniv = gen_is_any_zero; + break; + case (1 << 2): + /* test if -0 */ + op.fniv = gen_is_neg_zero; + break; + case (1 << 3): + /* test if +0 */ + op.fniv = gen_is_pos_zero; + break; + case ((1 << 4) | (1 << 5)): + /* test if +Inf or -Inf */ + op.fniv = gen_is_any_inf; + break; + case (1 << 4): + /* test if -Inf */ + op.fniv = gen_is_neg_inf; + break; + case (1 << 5): + /* test if +Inf */ + op.fniv = gen_is_pos_inf; + break; + case (1 << 6): + /* test if NaN */ + op.fniv = gen_is_nan; + break; + } tcg_gen_gvec_2i(vsr_full_offset(a->xt), vsr_full_offset(a->xb), - 16, 16, (int32_t)(a->uim), &op[vece - MO_32]); + 16, 16, a->uim, &op); return true; } -- 2.11.0