@@ -936,98 +936,44 @@ static DisasCond do_sed_cond(DisasContext *ctx, unsigned orig, bool d,
return do_log_cond(ctx, c * 2 + f, d, res);
}
-/* Similar, but for unit conditions. */
-
-static DisasCond do_unit_cond(unsigned cf, bool d, TCGv_i64 res,
- TCGv_i64 in1, TCGv_i64 in2)
+/* Similar, but for unit zero conditions. */
+static DisasCond do_unit_zero_cond(unsigned cf, bool d, TCGv_i64 res)
{
- DisasCond cond;
- TCGv_i64 tmp, cb = NULL;
+ TCGv_i64 tmp;
uint64_t d_repl = d ? 0x0000000100000001ull : 1;
-
- if (cf & 8) {
- /* Since we want to test lots of carry-out bits all at once, do not
- * do our normal thing and compute carry-in of bit B+1 since that
- * leaves us with carry bits spread across two words.
- */
- cb = tcg_temp_new_i64();
- tmp = tcg_temp_new_i64();
- tcg_gen_or_i64(cb, in1, in2);
- tcg_gen_and_i64(tmp, in1, in2);
- tcg_gen_andc_i64(cb, cb, res);
- tcg_gen_or_i64(cb, cb, tmp);
- }
+ uint64_t ones = 0, sgns = 0;
switch (cf >> 1) {
- case 0: /* never / TR */
- cond = cond_make_f();
- break;
-
case 1: /* SBW / NBW */
if (d) {
- tmp = tcg_temp_new_i64();
- tcg_gen_subi_i64(tmp, res, d_repl * 0x00000001u);
- tcg_gen_andc_i64(tmp, tmp, res);
- tcg_gen_andi_i64(tmp, tmp, d_repl * 0x80000000u);
- cond = cond_make_0(TCG_COND_NE, tmp);
- } else {
- /* undefined */
- cond = cond_make_f();
+ ones = d_repl;
+ sgns = d_repl << 31;
}
break;
-
case 2: /* SBZ / NBZ */
- /* See hasless(v,1) from
- * https://graphics.stanford.edu/~seander/bithacks.html#ZeroInWord
- */
- tmp = tcg_temp_new_i64();
- tcg_gen_subi_i64(tmp, res, d_repl * 0x01010101u);
- tcg_gen_andc_i64(tmp, tmp, res);
- tcg_gen_andi_i64(tmp, tmp, d_repl * 0x80808080u);
- cond = cond_make_0(TCG_COND_NE, tmp);
+ ones = d_repl * 0x01010101u;
+ sgns = ones << 7;
break;
-
case 3: /* SHZ / NHZ */
- tmp = tcg_temp_new_i64();
- tcg_gen_subi_i64(tmp, res, d_repl * 0x00010001u);
- tcg_gen_andc_i64(tmp, tmp, res);
- tcg_gen_andi_i64(tmp, tmp, d_repl * 0x80008000u);
- cond = cond_make_0(TCG_COND_NE, tmp);
+ ones = d_repl * 0x00010001u;
+ sgns = ones << 15;
break;
-
- case 4: /* SDC / NDC */
- tcg_gen_andi_i64(cb, cb, d_repl * 0x88888888u);
- cond = cond_make_0(TCG_COND_NE, cb);
- break;
-
- case 5: /* SWC / NWC */
- if (d) {
- tcg_gen_andi_i64(cb, cb, d_repl * 0x80000000u);
- cond = cond_make_0(TCG_COND_NE, cb);
- } else {
- /* undefined */
- cond = cond_make_f();
- }
- break;
-
- case 6: /* SBC / NBC */
- tcg_gen_andi_i64(cb, cb, d_repl * 0x80808080u);
- cond = cond_make_0(TCG_COND_NE, cb);
- break;
-
- case 7: /* SHC / NHC */
- tcg_gen_andi_i64(cb, cb, d_repl * 0x80008000u);
- cond = cond_make_0(TCG_COND_NE, cb);
- break;
-
- default:
- g_assert_not_reached();
}
- if (cf & 1) {
- cond.c = tcg_invert_cond(cond.c);
+ if (ones == 0) {
+ /* Undefined, or 0/1 (never/always). */
+ return cf & 1 ? cond_make_t() : cond_make_f();
}
- return cond;
+ /*
+ * See hasless(v,1) from
+ * https://graphics.stanford.edu/~seander/bithacks.html#ZeroInWord
+ */
+ tmp = tcg_temp_new_i64();
+ tcg_gen_subi_i64(tmp, res, ones);
+ tcg_gen_andc_i64(tmp, tmp, res);
+ tcg_gen_andi_i64(tmp, tmp, sgns);
+
+ return cond_make_0_tmp(cf & 1 ? TCG_COND_EQ : TCG_COND_NE, tmp);
}
static TCGv_i64 get_carry(DisasContext *ctx, bool d,
@@ -1330,34 +1276,86 @@ static bool do_log_reg(DisasContext *ctx, arg_rrr_cf_d *a,
return nullify_end(ctx);
}
-static void do_unit(DisasContext *ctx, unsigned rt, TCGv_i64 in1,
- TCGv_i64 in2, unsigned cf, bool d, bool is_tc,
- void (*fn)(TCGv_i64, TCGv_i64, TCGv_i64))
+static void do_unit_addsub(DisasContext *ctx, unsigned rt, TCGv_i64 in1,
+ TCGv_i64 in2, unsigned cf, bool d,
+ bool is_tc, bool is_add)
{
- TCGv_i64 dest;
+ TCGv_i64 dest = tcg_temp_new_i64();
+ uint64_t test_cb = 0;
DisasCond cond;
- if (cf == 0) {
- dest = dest_gpr(ctx, rt);
- fn(dest, in1, in2);
- save_gpr(ctx, rt, dest);
- cond_free(&ctx->null_cond);
- } else {
- dest = tcg_temp_new_i64();
- fn(dest, in1, in2);
-
- cond = do_unit_cond(cf, d, dest, in1, in2);
-
- if (is_tc) {
- TCGv_i64 tmp = tcg_temp_new_i64();
- tcg_gen_setcond_i64(cond.c, tmp, cond.a0, cond.a1);
- gen_helper_tcond(tcg_env, tmp);
+ /* Select which carry-out bits to test. */
+ switch (cf >> 1) {
+ case 4: /* NDC / SDC -- 4-bit carries */
+ test_cb = dup_const(MO_8, 0x88);
+ break;
+ case 5: /* NWC / SWC -- 32-bit carries */
+ if (d) {
+ test_cb = dup_const(MO_32, INT32_MIN);
+ } else {
+ cf &= 1; /* undefined -- map to never/always */
}
- save_gpr(ctx, rt, dest);
-
- cond_free(&ctx->null_cond);
- ctx->null_cond = cond;
+ break;
+ case 6: /* NBC / SBC -- 8-bit carries */
+ test_cb = dup_const(MO_8, INT8_MIN);
+ break;
+ case 7: /* NHC / SHC -- 16-bit carries */
+ test_cb = dup_const(MO_16, INT16_MIN);
+ break;
}
+ if (!d) {
+ test_cb = (uint32_t)test_cb;
+ }
+
+ if (!test_cb) {
+ /* No need to compute carries if we don't need to test them. */
+ if (is_add) {
+ tcg_gen_add_i64(dest, in1, in2);
+ } else {
+ tcg_gen_sub_i64(dest, in1, in2);
+ }
+ cond = do_unit_zero_cond(cf, d, dest);
+ } else {
+ TCGv_i64 cb = tcg_temp_new_i64();
+
+ if (d) {
+ TCGv_i64 cb_msb = tcg_temp_new_i64();
+ if (is_add) {
+ tcg_gen_add2_i64(dest, cb_msb, in1, ctx->zero, in2, ctx->zero);
+ tcg_gen_xor_i64(cb, in1, in2);
+ } else {
+ /* See do_sub, !is_b. */
+ TCGv_i64 one = tcg_constant_i64(1);
+ tcg_gen_sub2_i64(dest, cb_msb, in1, one, in2, ctx->zero);
+ tcg_gen_eqv_i64(cb, in1, in2);
+ }
+ tcg_gen_xor_i64(cb, cb, dest);
+ tcg_gen_extract2_i64(cb, cb, cb_msb, 1);
+ } else {
+ if (is_add) {
+ tcg_gen_add_i64(dest, in1, in2);
+ tcg_gen_xor_i64(cb, in1, in2);
+ } else {
+ tcg_gen_sub_i64(dest, in1, in2);
+ tcg_gen_eqv_i64(cb, in1, in2);
+ }
+ tcg_gen_xor_i64(cb, cb, dest);
+ tcg_gen_shri_i64(cb, cb, 1);
+ }
+
+ tcg_gen_andi_i64(cb, cb, test_cb);
+ cond = cond_make_0_tmp(cf & 1 ? TCG_COND_EQ : TCG_COND_NE, cb);
+ }
+
+ if (is_tc) {
+ TCGv_i64 tmp = tcg_temp_new_i64();
+ tcg_gen_setcond_i64(cond.c, tmp, cond.a0, cond.a1);
+ gen_helper_tcond(tcg_env, tmp);
+ }
+ save_gpr(ctx, rt, dest);
+
+ cond_free(&ctx->null_cond);
+ ctx->null_cond = cond;
}
#ifndef CONFIG_USER_ONLY
@@ -2748,14 +2746,24 @@ static bool trans_cmpclr(DisasContext *ctx, arg_rrr_cf_d *a)
static bool trans_uxor(DisasContext *ctx, arg_rrr_cf_d *a)
{
- TCGv_i64 tcg_r1, tcg_r2;
+ TCGv_i64 tcg_r1, tcg_r2, dest;
if (a->cf) {
nullify_over(ctx);
}
+
tcg_r1 = load_gpr(ctx, a->r1);
tcg_r2 = load_gpr(ctx, a->r2);
- do_unit(ctx, a->t, tcg_r1, tcg_r2, a->cf, a->d, false, tcg_gen_xor_i64);
+ dest = dest_gpr(ctx, a->t);
+
+ tcg_gen_xor_i64(dest, tcg_r1, tcg_r2);
+ save_gpr(ctx, a->t, dest);
+
+ cond_free(&ctx->null_cond);
+ if (a->cf) {
+ ctx->null_cond = do_unit_zero_cond(a->cf, a->d, dest);
+ }
+
return nullify_end(ctx);
}
@@ -2790,7 +2798,7 @@ static bool do_uaddcm(DisasContext *ctx, arg_rrr_cf_d *a, bool is_tc)
tcg_r2 = load_gpr(ctx, a->r2);
tmp = tcg_temp_new_i64();
tcg_gen_not_i64(tmp, tcg_r2);
- do_unit(ctx, a->t, tcg_r1, tmp, a->cf, a->d, is_tc, tcg_gen_add_i64);
+ do_unit_addsub(ctx, a->t, tcg_r1, tmp, a->cf, a->d, is_tc, true);
return nullify_end(ctx);
}
@@ -2817,8 +2825,8 @@ static bool do_dcor(DisasContext *ctx, arg_rr_cf_d *a, bool is_i)
}
tcg_gen_andi_i64(tmp, tmp, (uint64_t)0x1111111111111111ull);
tcg_gen_muli_i64(tmp, tmp, 6);
- do_unit(ctx, a->t, load_gpr(ctx, a->r), tmp, a->cf, a->d, false,
- is_i ? tcg_gen_add_i64 : tcg_gen_sub_i64);
+ do_unit_addsub(ctx, a->t, load_gpr(ctx, a->r), tmp,
+ a->cf, a->d, false, is_i);
return nullify_end(ctx);
}