target/riscv: support for 128-bit M extension
Mult are generated inline (using a cool trick pointed out by Richard), but for div and rem, given the complexity of the implementation of these instructions, we call helpers to produce their behavior. From an implementation standpoint, the helpers return the low part of the results, while the high part is temporarily stored in a dedicated field of cpu_env that is used to update the architectural register in the generation wrapper. Signed-off-by: Frédéric Pétrot <frederic.petrot@univ-grenoble-alpes.fr> Co-authored-by: Fabien Portas <fabien.portas@grenoble-inp.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Message-id: 20220106210108.138226-15-frederic.petrot@univ-grenoble-alpes.fr Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
This commit is contained in:
Frédéric Pétrot
Alistair Francis
parent
7fd40f8679
commit
b3a5d1fbeb
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@ -143,6 +143,9 @@ struct CPURISCVState {
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uint32_t misa_ext; /* current extensions */
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uint32_t misa_ext_mask; /* max ext for this cpu */
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/* 128-bit helpers upper part return value */
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target_ulong retxh;
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uint32_t features;
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#ifdef CONFIG_USER_ONLY
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@ -1101,3 +1101,9 @@ DEF_HELPER_5(vsext_vf2_d, void, ptr, ptr, ptr, env, i32)
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DEF_HELPER_5(vsext_vf4_w, void, ptr, ptr, ptr, env, i32)
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DEF_HELPER_5(vsext_vf4_d, void, ptr, ptr, ptr, env, i32)
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DEF_HELPER_5(vsext_vf8_d, void, ptr, ptr, ptr, env, i32)
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/* 128-bit integer multiplication and division */
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DEF_HELPER_5(divu_i128, tl, env, tl, tl, tl, tl)
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DEF_HELPER_5(divs_i128, tl, env, tl, tl, tl, tl)
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DEF_HELPER_5(remu_i128, tl, env, tl, tl, tl, tl)
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DEF_HELPER_5(rems_i128, tl, env, tl, tl, tl, tl)
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@ -197,6 +197,13 @@ divuw 0000001 ..... ..... 101 ..... 0111011 @r
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remw 0000001 ..... ..... 110 ..... 0111011 @r
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remuw 0000001 ..... ..... 111 ..... 0111011 @r
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# *** RV128M Standard Extension (in addition to RV64M) ***
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muld 0000001 ..... ..... 000 ..... 1111011 @r
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divd 0000001 ..... ..... 100 ..... 1111011 @r
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divud 0000001 ..... ..... 101 ..... 1111011 @r
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remd 0000001 ..... ..... 110 ..... 1111011 @r
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remud 0000001 ..... ..... 111 ..... 1111011 @r
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# *** RV32A Standard Extension ***
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lr_w 00010 . . 00000 ..... 010 ..... 0101111 @atom_ld
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sc_w 00011 . . ..... ..... 010 ..... 0101111 @atom_st
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@ -18,11 +18,79 @@
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* this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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static void gen_mulhu_i128(TCGv r2, TCGv r3, TCGv al, TCGv ah, TCGv bl, TCGv bh)
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{
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TCGv tmpl = tcg_temp_new();
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TCGv tmph = tcg_temp_new();
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TCGv r0 = tcg_temp_new();
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TCGv r1 = tcg_temp_new();
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TCGv zero = tcg_constant_tl(0);
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tcg_gen_mulu2_tl(r0, r1, al, bl);
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tcg_gen_mulu2_tl(tmpl, tmph, al, bh);
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tcg_gen_add2_tl(r1, r2, r1, zero, tmpl, tmph);
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tcg_gen_mulu2_tl(tmpl, tmph, ah, bl);
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tcg_gen_add2_tl(r1, tmph, r1, r2, tmpl, tmph);
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/* Overflow detection into r3 */
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tcg_gen_setcond_tl(TCG_COND_LTU, r3, tmph, r2);
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tcg_gen_mov_tl(r2, tmph);
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tcg_gen_mulu2_tl(tmpl, tmph, ah, bh);
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tcg_gen_add2_tl(r2, r3, r2, r3, tmpl, tmph);
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tcg_temp_free(tmpl);
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tcg_temp_free(tmph);
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}
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static void gen_mul_i128(TCGv rl, TCGv rh,
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TCGv rs1l, TCGv rs1h, TCGv rs2l, TCGv rs2h)
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{
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TCGv tmpl = tcg_temp_new();
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TCGv tmph = tcg_temp_new();
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TCGv tmpx = tcg_temp_new();
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TCGv zero = tcg_constant_tl(0);
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tcg_gen_mulu2_tl(rl, rh, rs1l, rs2l);
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tcg_gen_mulu2_tl(tmpl, tmph, rs1l, rs2h);
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tcg_gen_add2_tl(rh, tmpx, rh, zero, tmpl, tmph);
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tcg_gen_mulu2_tl(tmpl, tmph, rs1h, rs2l);
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tcg_gen_add2_tl(rh, tmph, rh, tmpx, tmpl, tmph);
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tcg_temp_free(tmpl);
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tcg_temp_free(tmph);
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tcg_temp_free(tmpx);
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}
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static bool trans_mul(DisasContext *ctx, arg_mul *a)
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{
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REQUIRE_EXT(ctx, RVM);
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return gen_arith(ctx, a, EXT_NONE, tcg_gen_mul_tl, NULL);
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return gen_arith(ctx, a, EXT_NONE, tcg_gen_mul_tl, gen_mul_i128);
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}
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static void gen_mulh_i128(TCGv rl, TCGv rh,
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TCGv rs1l, TCGv rs1h, TCGv rs2l, TCGv rs2h)
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{
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TCGv t0l = tcg_temp_new();
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TCGv t0h = tcg_temp_new();
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TCGv t1l = tcg_temp_new();
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TCGv t1h = tcg_temp_new();
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gen_mulhu_i128(rl, rh, rs1l, rs1h, rs2l, rs2h);
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tcg_gen_sari_tl(t0h, rs1h, 63);
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tcg_gen_and_tl(t0l, t0h, rs2l);
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tcg_gen_and_tl(t0h, t0h, rs2h);
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tcg_gen_sari_tl(t1h, rs2h, 63);
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tcg_gen_and_tl(t1l, t1h, rs1l);
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tcg_gen_and_tl(t1h, t1h, rs1h);
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tcg_gen_sub2_tl(t0l, t0h, rl, rh, t0l, t0h);
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tcg_gen_sub2_tl(rl, rh, t0l, t0h, t1l, t1h);
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tcg_temp_free(t0l);
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tcg_temp_free(t0h);
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tcg_temp_free(t1l);
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tcg_temp_free(t1h);
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}
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static void gen_mulh(TCGv ret, TCGv s1, TCGv s2)
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@ -42,7 +110,25 @@ static void gen_mulh_w(TCGv ret, TCGv s1, TCGv s2)
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static bool trans_mulh(DisasContext *ctx, arg_mulh *a)
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{
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REQUIRE_EXT(ctx, RVM);
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return gen_arith_per_ol(ctx, a, EXT_SIGN, gen_mulh, gen_mulh_w, NULL);
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return gen_arith_per_ol(ctx, a, EXT_SIGN, gen_mulh, gen_mulh_w,
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gen_mulh_i128);
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}
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static void gen_mulhsu_i128(TCGv rl, TCGv rh,
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TCGv rs1l, TCGv rs1h, TCGv rs2l, TCGv rs2h)
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{
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TCGv t0l = tcg_temp_new();
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TCGv t0h = tcg_temp_new();
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gen_mulhu_i128(rl, rh, rs1l, rs1h, rs2l, rs2h);
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tcg_gen_sari_tl(t0h, rs1h, 63);
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tcg_gen_and_tl(t0l, t0h, rs2l);
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tcg_gen_and_tl(t0h, t0h, rs2h);
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tcg_gen_sub2_tl(rl, rh, rl, rh, t0l, t0h);
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tcg_temp_free(t0l);
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tcg_temp_free(t0h);
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}
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static void gen_mulhsu(TCGv ret, TCGv arg1, TCGv arg2)
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@ -76,7 +162,8 @@ static void gen_mulhsu_w(TCGv ret, TCGv arg1, TCGv arg2)
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static bool trans_mulhsu(DisasContext *ctx, arg_mulhsu *a)
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{
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REQUIRE_EXT(ctx, RVM);
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return gen_arith_per_ol(ctx, a, EXT_NONE, gen_mulhsu, gen_mulhsu_w, NULL);
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return gen_arith_per_ol(ctx, a, EXT_NONE, gen_mulhsu, gen_mulhsu_w,
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gen_mulhsu_i128);
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}
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static void gen_mulhu(TCGv ret, TCGv s1, TCGv s2)
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@ -91,7 +178,15 @@ static bool trans_mulhu(DisasContext *ctx, arg_mulhu *a)
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{
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REQUIRE_EXT(ctx, RVM);
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/* gen_mulh_w works for either sign as input. */
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return gen_arith_per_ol(ctx, a, EXT_ZERO, gen_mulhu, gen_mulh_w, NULL);
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return gen_arith_per_ol(ctx, a, EXT_ZERO, gen_mulhu, gen_mulh_w,
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gen_mulhu_i128);
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}
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static void gen_div_i128(TCGv rdl, TCGv rdh,
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TCGv rs1l, TCGv rs1h, TCGv rs2l, TCGv rs2h)
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{
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gen_helper_divs_i128(rdl, cpu_env, rs1l, rs1h, rs2l, rs2h);
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tcg_gen_ld_tl(rdh, cpu_env, offsetof(CPURISCVState, retxh));
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}
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static void gen_div(TCGv ret, TCGv source1, TCGv source2)
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@ -130,7 +225,14 @@ static void gen_div(TCGv ret, TCGv source1, TCGv source2)
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static bool trans_div(DisasContext *ctx, arg_div *a)
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{
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REQUIRE_EXT(ctx, RVM);
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return gen_arith(ctx, a, EXT_SIGN, gen_div, NULL);
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return gen_arith(ctx, a, EXT_SIGN, gen_div, gen_div_i128);
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}
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static void gen_divu_i128(TCGv rdl, TCGv rdh,
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TCGv rs1l, TCGv rs1h, TCGv rs2l, TCGv rs2h)
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{
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gen_helper_divu_i128(rdl, cpu_env, rs1l, rs1h, rs2l, rs2h);
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tcg_gen_ld_tl(rdh, cpu_env, offsetof(CPURISCVState, retxh));
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}
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static void gen_divu(TCGv ret, TCGv source1, TCGv source2)
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@ -158,7 +260,14 @@ static void gen_divu(TCGv ret, TCGv source1, TCGv source2)
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static bool trans_divu(DisasContext *ctx, arg_divu *a)
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{
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REQUIRE_EXT(ctx, RVM);
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return gen_arith(ctx, a, EXT_ZERO, gen_divu, NULL);
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return gen_arith(ctx, a, EXT_ZERO, gen_divu, gen_divu_i128);
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}
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static void gen_rem_i128(TCGv rdl, TCGv rdh,
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TCGv rs1l, TCGv rs1h, TCGv rs2l, TCGv rs2h)
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{
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gen_helper_rems_i128(rdl, cpu_env, rs1l, rs1h, rs2l, rs2h);
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tcg_gen_ld_tl(rdh, cpu_env, offsetof(CPURISCVState, retxh));
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}
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static void gen_rem(TCGv ret, TCGv source1, TCGv source2)
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@ -199,7 +308,14 @@ static void gen_rem(TCGv ret, TCGv source1, TCGv source2)
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static bool trans_rem(DisasContext *ctx, arg_rem *a)
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{
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REQUIRE_EXT(ctx, RVM);
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return gen_arith(ctx, a, EXT_SIGN, gen_rem, NULL);
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return gen_arith(ctx, a, EXT_SIGN, gen_rem, gen_rem_i128);
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}
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static void gen_remu_i128(TCGv rdl, TCGv rdh,
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TCGv rs1l, TCGv rs1h, TCGv rs2l, TCGv rs2h)
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{
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gen_helper_remu_i128(rdl, cpu_env, rs1l, rs1h, rs2l, rs2h);
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tcg_gen_ld_tl(rdh, cpu_env, offsetof(CPURISCVState, retxh));
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}
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static void gen_remu(TCGv ret, TCGv source1, TCGv source2)
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@ -227,12 +343,12 @@ static void gen_remu(TCGv ret, TCGv source1, TCGv source2)
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static bool trans_remu(DisasContext *ctx, arg_remu *a)
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{
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REQUIRE_EXT(ctx, RVM);
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return gen_arith(ctx, a, EXT_ZERO, gen_remu, NULL);
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return gen_arith(ctx, a, EXT_ZERO, gen_remu, gen_remu_i128);
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}
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static bool trans_mulw(DisasContext *ctx, arg_mulw *a)
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{
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REQUIRE_64BIT(ctx);
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REQUIRE_64_OR_128BIT(ctx);
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REQUIRE_EXT(ctx, RVM);
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ctx->ol = MXL_RV32;
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return gen_arith(ctx, a, EXT_NONE, tcg_gen_mul_tl, NULL);
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@ -240,7 +356,7 @@ static bool trans_mulw(DisasContext *ctx, arg_mulw *a)
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static bool trans_divw(DisasContext *ctx, arg_divw *a)
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{
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REQUIRE_64BIT(ctx);
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REQUIRE_64_OR_128BIT(ctx);
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REQUIRE_EXT(ctx, RVM);
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ctx->ol = MXL_RV32;
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return gen_arith(ctx, a, EXT_SIGN, gen_div, NULL);
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@ -248,7 +364,7 @@ static bool trans_divw(DisasContext *ctx, arg_divw *a)
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static bool trans_divuw(DisasContext *ctx, arg_divuw *a)
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{
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REQUIRE_64BIT(ctx);
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REQUIRE_64_OR_128BIT(ctx);
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REQUIRE_EXT(ctx, RVM);
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ctx->ol = MXL_RV32;
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return gen_arith(ctx, a, EXT_ZERO, gen_divu, NULL);
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@ -256,7 +372,7 @@ static bool trans_divuw(DisasContext *ctx, arg_divuw *a)
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static bool trans_remw(DisasContext *ctx, arg_remw *a)
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{
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REQUIRE_64BIT(ctx);
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REQUIRE_64_OR_128BIT(ctx);
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REQUIRE_EXT(ctx, RVM);
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ctx->ol = MXL_RV32;
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return gen_arith(ctx, a, EXT_SIGN, gen_rem, NULL);
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@ -264,8 +380,48 @@ static bool trans_remw(DisasContext *ctx, arg_remw *a)
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static bool trans_remuw(DisasContext *ctx, arg_remuw *a)
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{
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REQUIRE_64BIT(ctx);
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REQUIRE_64_OR_128BIT(ctx);
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REQUIRE_EXT(ctx, RVM);
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ctx->ol = MXL_RV32;
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return gen_arith(ctx, a, EXT_ZERO, gen_remu, NULL);
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}
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static bool trans_muld(DisasContext *ctx, arg_muld *a)
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{
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REQUIRE_128BIT(ctx);
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REQUIRE_EXT(ctx, RVM);
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ctx->ol = MXL_RV64;
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return gen_arith(ctx, a, EXT_SIGN, tcg_gen_mul_tl, NULL);
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}
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static bool trans_divd(DisasContext *ctx, arg_divd *a)
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{
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REQUIRE_128BIT(ctx);
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REQUIRE_EXT(ctx, RVM);
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ctx->ol = MXL_RV64;
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return gen_arith(ctx, a, EXT_SIGN, gen_div, NULL);
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}
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static bool trans_divud(DisasContext *ctx, arg_divud *a)
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{
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REQUIRE_128BIT(ctx);
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REQUIRE_EXT(ctx, RVM);
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ctx->ol = MXL_RV64;
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return gen_arith(ctx, a, EXT_ZERO, gen_divu, NULL);
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}
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static bool trans_remd(DisasContext *ctx, arg_remd *a)
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{
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REQUIRE_128BIT(ctx);
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REQUIRE_EXT(ctx, RVM);
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ctx->ol = MXL_RV64;
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return gen_arith(ctx, a, EXT_SIGN, gen_rem, NULL);
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}
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static bool trans_remud(DisasContext *ctx, arg_remud *a)
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{
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REQUIRE_128BIT(ctx);
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REQUIRE_EXT(ctx, RVM);
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ctx->ol = MXL_RV64;
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return gen_arith(ctx, a, EXT_ZERO, gen_remu, NULL);
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}
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@ -0,0 +1,109 @@
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/*
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* RISC-V Emulation Helpers for QEMU.
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*
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* Copyright (c) 2016-2017 Sagar Karandikar, sagark@eecs.berkeley.edu
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* Copyright (c) 2017-2018 SiFive, Inc.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2 or later, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
|
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* this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "qemu/osdep.h"
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#include "cpu.h"
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#include "qemu/main-loop.h"
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#include "exec/exec-all.h"
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#include "exec/helper-proto.h"
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target_ulong HELPER(divu_i128)(CPURISCVState *env,
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target_ulong ul, target_ulong uh,
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target_ulong vl, target_ulong vh)
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{
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target_ulong ql, qh;
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Int128 q;
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if (vl == 0 && vh == 0) { /* Handle special behavior on div by zero */
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ql = ~0x0;
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qh = ~0x0;
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} else {
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q = int128_divu(int128_make128(ul, uh), int128_make128(vl, vh));
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ql = int128_getlo(q);
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||||
qh = int128_gethi(q);
|
||||
}
|
||||
|
||||
env->retxh = qh;
|
||||
return ql;
|
||||
}
|
||||
|
||||
target_ulong HELPER(remu_i128)(CPURISCVState *env,
|
||||
target_ulong ul, target_ulong uh,
|
||||
target_ulong vl, target_ulong vh)
|
||||
{
|
||||
target_ulong rl, rh;
|
||||
Int128 r;
|
||||
|
||||
if (vl == 0 && vh == 0) {
|
||||
rl = ul;
|
||||
rh = uh;
|
||||
} else {
|
||||
r = int128_remu(int128_make128(ul, uh), int128_make128(vl, vh));
|
||||
rl = int128_getlo(r);
|
||||
rh = int128_gethi(r);
|
||||
}
|
||||
|
||||
env->retxh = rh;
|
||||
return rl;
|
||||
}
|
||||
|
||||
target_ulong HELPER(divs_i128)(CPURISCVState *env,
|
||||
target_ulong ul, target_ulong uh,
|
||||
target_ulong vl, target_ulong vh)
|
||||
{
|
||||
target_ulong qh, ql;
|
||||
Int128 q;
|
||||
|
||||
if (vl == 0 && vh == 0) { /* Div by zero check */
|
||||
ql = ~0x0;
|
||||
qh = ~0x0;
|
||||
} else if (uh == (1ULL << (TARGET_LONG_BITS - 1)) && ul == 0 &&
|
||||
vh == ~0x0 && vl == ~0x0) {
|
||||
/* Signed div overflow check (-2**127 / -1) */
|
||||
ql = ul;
|
||||
qh = uh;
|
||||
} else {
|
||||
q = int128_divs(int128_make128(ul, uh), int128_make128(vl, vh));
|
||||
ql = int128_getlo(q);
|
||||
qh = int128_gethi(q);
|
||||
}
|
||||
|
||||
env->retxh = qh;
|
||||
return ql;
|
||||
}
|
||||
|
||||
target_ulong HELPER(rems_i128)(CPURISCVState *env,
|
||||
target_ulong ul, target_ulong uh,
|
||||
target_ulong vl, target_ulong vh)
|
||||
{
|
||||
target_ulong rh, rl;
|
||||
Int128 r;
|
||||
|
||||
if (vl == 0 && vh == 0) {
|
||||
rl = ul;
|
||||
rh = uh;
|
||||
} else {
|
||||
r = int128_rems(int128_make128(ul, uh), int128_make128(vl, vh));
|
||||
rl = int128_getlo(r);
|
||||
rh = int128_gethi(r);
|
||||
}
|
||||
|
||||
env->retxh = rh;
|
||||
return rl;
|
||||
}
|
||||
|
|
@ -18,6 +18,7 @@ riscv_ss.add(files(
|
|||
'vector_helper.c',
|
||||
'bitmanip_helper.c',
|
||||
'translate.c',
|
||||
'm128_helper.c'
|
||||
))
|
||||
|
||||
riscv_softmmu_ss = ss.source_set()
|
||||
|
|
|
|||
Loading…
Reference in New Issue