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[PATCH v3 1/4] target/s390x: Improve cc computation for ADD LOGICAL
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From: |
Richard Henderson |
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Subject: |
[PATCH v3 1/4] target/s390x: Improve cc computation for ADD LOGICAL |
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Date: |
Mon, 14 Dec 2020 16:13:53 -0600 |
The resulting cc is only dependent on the result and the
carry-out. So save those things rather than the inputs.
Carry-out for 64-bit inputs is had via tcg_gen_add2_i64 directly
into cc_src. Carry-out for 32-bit inputs is had via extraction
from a normal 64-bit add (with zero-extended inputs).
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
target/s390x/internal.h | 4 +-
target/s390x/cc_helper.c | 25 ++++-----
target/s390x/helper.c | 3 +-
target/s390x/translate.c | 103 ++++++++++++++++++++++++-------------
target/s390x/insn-data.def | 36 ++++++-------
5 files changed, 97 insertions(+), 74 deletions(-)
diff --git a/target/s390x/internal.h b/target/s390x/internal.h
index 64602660ae..55c5442102 100644
--- a/target/s390x/internal.h
+++ b/target/s390x/internal.h
@@ -160,6 +160,8 @@ enum cc_op {
CC_OP_STATIC, /* CC value is env->cc_op */
CC_OP_NZ, /* env->cc_dst != 0 */
+ CC_OP_ADDU, /* dst != 0, src = carry out (0,1) */
+
CC_OP_LTGT_32, /* signed less/greater than (32bit) */
CC_OP_LTGT_64, /* signed less/greater than (64bit) */
CC_OP_LTUGTU_32, /* unsigned less/greater than (32bit) */
@@ -168,7 +170,6 @@ enum cc_op {
CC_OP_LTGT0_64, /* signed less/greater than 0 (64bit) */
CC_OP_ADD_64, /* overflow on add (64bit) */
- CC_OP_ADDU_64, /* overflow on unsigned add (64bit) */
CC_OP_ADDC_64, /* overflow on unsigned add-carry (64bit) */
CC_OP_SUB_64, /* overflow on subtraction (64bit) */
CC_OP_SUBU_64, /* overflow on unsigned subtraction (64bit) */
@@ -178,7 +179,6 @@ enum cc_op {
CC_OP_MULS_64, /* overflow on signed multiply (64bit) */
CC_OP_ADD_32, /* overflow on add (32bit) */
- CC_OP_ADDU_32, /* overflow on unsigned add (32bit) */
CC_OP_ADDC_32, /* overflow on unsigned add-carry (32bit) */
CC_OP_SUB_32, /* overflow on subtraction (32bit) */
CC_OP_SUBU_32, /* overflow on unsigned subtraction (32bit) */
diff --git a/target/s390x/cc_helper.c b/target/s390x/cc_helper.c
index 5432aeeed4..59da4d1cc2 100644
--- a/target/s390x/cc_helper.c
+++ b/target/s390x/cc_helper.c
@@ -123,6 +123,12 @@ static uint32_t cc_calc_nz(uint64_t dst)
return !!dst;
}
+static uint32_t cc_calc_addu(uint64_t carry_out, uint64_t result)
+{
+ g_assert(carry_out <= 1);
+ return (result != 0) + 2 * carry_out;
+}
+
static uint32_t cc_calc_add_64(int64_t a1, int64_t a2, int64_t ar)
{
if ((a1 > 0 && a2 > 0 && ar < 0) || (a1 < 0 && a2 < 0 && ar > 0)) {
@@ -138,11 +144,6 @@ static uint32_t cc_calc_add_64(int64_t a1, int64_t a2,
int64_t ar)
}
}
-static uint32_t cc_calc_addu_64(uint64_t a1, uint64_t a2, uint64_t ar)
-{
- return (ar != 0) + 2 * (ar < a1);
-}
-
static uint32_t cc_calc_addc_64(uint64_t a1, uint64_t a2, uint64_t ar)
{
/* Recover a2 + carry_in. */
@@ -239,11 +240,6 @@ static uint32_t cc_calc_add_32(int32_t a1, int32_t a2,
int32_t ar)
}
}
-static uint32_t cc_calc_addu_32(uint32_t a1, uint32_t a2, uint32_t ar)
-{
- return (ar != 0) + 2 * (ar < a1);
-}
-
static uint32_t cc_calc_addc_32(uint32_t a1, uint32_t a2, uint32_t ar)
{
/* Recover a2 + carry_in. */
@@ -483,12 +479,12 @@ static uint32_t do_calc_cc(CPUS390XState *env, uint32_t
cc_op,
case CC_OP_NZ:
r = cc_calc_nz(dst);
break;
+ case CC_OP_ADDU:
+ r = cc_calc_addu(src, dst);
+ break;
case CC_OP_ADD_64:
r = cc_calc_add_64(src, dst, vr);
break;
- case CC_OP_ADDU_64:
- r = cc_calc_addu_64(src, dst, vr);
- break;
case CC_OP_ADDC_64:
r = cc_calc_addc_64(src, dst, vr);
break;
@@ -517,9 +513,6 @@ static uint32_t do_calc_cc(CPUS390XState *env, uint32_t
cc_op,
case CC_OP_ADD_32:
r = cc_calc_add_32(src, dst, vr);
break;
- case CC_OP_ADDU_32:
- r = cc_calc_addu_32(src, dst, vr);
- break;
case CC_OP_ADDC_32:
r = cc_calc_addc_32(src, dst, vr);
break;
diff --git a/target/s390x/helper.c b/target/s390x/helper.c
index b877690845..db87a62a57 100644
--- a/target/s390x/helper.c
+++ b/target/s390x/helper.c
@@ -395,6 +395,7 @@ const char *cc_name(enum cc_op cc_op)
[CC_OP_DYNAMIC] = "CC_OP_DYNAMIC",
[CC_OP_STATIC] = "CC_OP_STATIC",
[CC_OP_NZ] = "CC_OP_NZ",
+ [CC_OP_ADDU] = "CC_OP_ADDU",
[CC_OP_LTGT_32] = "CC_OP_LTGT_32",
[CC_OP_LTGT_64] = "CC_OP_LTGT_64",
[CC_OP_LTUGTU_32] = "CC_OP_LTUGTU_32",
@@ -402,7 +403,6 @@ const char *cc_name(enum cc_op cc_op)
[CC_OP_LTGT0_32] = "CC_OP_LTGT0_32",
[CC_OP_LTGT0_64] = "CC_OP_LTGT0_64",
[CC_OP_ADD_64] = "CC_OP_ADD_64",
- [CC_OP_ADDU_64] = "CC_OP_ADDU_64",
[CC_OP_ADDC_64] = "CC_OP_ADDC_64",
[CC_OP_SUB_64] = "CC_OP_SUB_64",
[CC_OP_SUBU_64] = "CC_OP_SUBU_64",
@@ -410,7 +410,6 @@ const char *cc_name(enum cc_op cc_op)
[CC_OP_ABS_64] = "CC_OP_ABS_64",
[CC_OP_NABS_64] = "CC_OP_NABS_64",
[CC_OP_ADD_32] = "CC_OP_ADD_32",
- [CC_OP_ADDU_32] = "CC_OP_ADDU_32",
[CC_OP_ADDC_32] = "CC_OP_ADDC_32",
[CC_OP_SUB_32] = "CC_OP_SUB_32",
[CC_OP_SUBU_32] = "CC_OP_SUBU_32",
diff --git a/target/s390x/translate.c b/target/s390x/translate.c
index be32938f6d..b473233edf 100644
--- a/target/s390x/translate.c
+++ b/target/s390x/translate.c
@@ -600,13 +600,11 @@ static void gen_op_calc_cc(DisasContext *s)
dummy = tcg_const_i64(0);
/* FALLTHRU */
case CC_OP_ADD_64:
- case CC_OP_ADDU_64:
case CC_OP_ADDC_64:
case CC_OP_SUB_64:
case CC_OP_SUBU_64:
case CC_OP_SUBB_64:
case CC_OP_ADD_32:
- case CC_OP_ADDU_32:
case CC_OP_ADDC_32:
case CC_OP_SUB_32:
case CC_OP_SUBU_32:
@@ -650,6 +648,7 @@ static void gen_op_calc_cc(DisasContext *s)
/* 1 argument */
gen_helper_calc_cc(cc_op, cpu_env, local_cc_op, dummy, cc_dst, dummy);
break;
+ case CC_OP_ADDU:
case CC_OP_ICM:
case CC_OP_LTGT_32:
case CC_OP_LTGT_64:
@@ -666,13 +665,11 @@ static void gen_op_calc_cc(DisasContext *s)
gen_helper_calc_cc(cc_op, cpu_env, local_cc_op, cc_src, cc_dst, dummy);
break;
case CC_OP_ADD_64:
- case CC_OP_ADDU_64:
case CC_OP_ADDC_64:
case CC_OP_SUB_64:
case CC_OP_SUBU_64:
case CC_OP_SUBB_64:
case CC_OP_ADD_32:
- case CC_OP_ADDU_32:
case CC_OP_ADDC_32:
case CC_OP_SUB_32:
case CC_OP_SUBU_32:
@@ -849,20 +846,19 @@ static void disas_jcc(DisasContext *s, DisasCompare *c,
uint32_t mask)
account_inline_branch(s, old_cc_op);
break;
- case CC_OP_ADDU_32:
- case CC_OP_ADDU_64:
+ case CC_OP_ADDU:
switch (mask) {
- case 8 | 2: /* vr == 0 */
+ case 8 | 2: /* result == 0 */
cond = TCG_COND_EQ;
break;
- case 4 | 1: /* vr != 0 */
+ case 4 | 1: /* result != 0 */
cond = TCG_COND_NE;
break;
- case 8 | 4: /* no carry -> vr >= src */
- cond = TCG_COND_GEU;
+ case 8 | 4: /* no carry */
+ cond = TCG_COND_EQ;
break;
- case 2 | 1: /* carry -> vr < src */
- cond = TCG_COND_LTU;
+ case 2 | 1: /* carry */
+ cond = TCG_COND_NE;
break;
default:
goto do_dynamic;
@@ -950,26 +946,21 @@ static void disas_jcc(DisasContext *s, DisasCompare *c,
uint32_t mask)
tcg_gen_and_i64(c->u.s64.a, cc_src, cc_dst);
break;
- case CC_OP_ADDU_32:
- c->is_64 = false;
- c->u.s32.a = tcg_temp_new_i32();
- c->u.s32.b = tcg_temp_new_i32();
- tcg_gen_extrl_i64_i32(c->u.s32.a, cc_vr);
- if (cond == TCG_COND_EQ || cond == TCG_COND_NE) {
- tcg_gen_movi_i32(c->u.s32.b, 0);
- } else {
- tcg_gen_extrl_i64_i32(c->u.s32.b, cc_src);
- }
- break;
-
- case CC_OP_ADDU_64:
- c->u.s64.a = cc_vr;
+ case CC_OP_ADDU:
+ c->is_64 = true;
+ c->u.s64.b = tcg_const_i64(0);
c->g1 = true;
- if (cond == TCG_COND_EQ || cond == TCG_COND_NE) {
- c->u.s64.b = tcg_const_i64(0);
- } else {
- c->u.s64.b = cc_src;
- c->g2 = true;
+ switch (mask) {
+ case 8 | 2:
+ case 4 | 1: /* result */
+ c->u.s64.a = cc_dst;
+ break;
+ case 8 | 4:
+ case 2 | 1: /* carry */
+ c->u.s64.a = cc_src;
+ break;
+ default:
+ g_assert_not_reached();
}
break;
@@ -1445,6 +1436,13 @@ static DisasJumpType op_add(DisasContext *s, DisasOps *o)
return DISAS_NEXT;
}
+static DisasJumpType op_addu64(DisasContext *s, DisasOps *o)
+{
+ tcg_gen_movi_i64(cc_src, 0);
+ tcg_gen_add2_i64(o->out, cc_src, o->in1, cc_src, o->in2, cc_src);
+ return DISAS_NEXT;
+}
+
static DisasJumpType op_addc(DisasContext *s, DisasOps *o)
{
DisasCompare cmp;
@@ -1474,9 +1472,10 @@ static DisasJumpType op_addc(DisasContext *s, DisasOps
*o)
static DisasJumpType op_asi(DisasContext *s, DisasOps *o)
{
- o->in1 = tcg_temp_new_i64();
+ bool non_atomic = !s390_has_feat(S390_FEAT_STFLE_45);
- if (!s390_has_feat(S390_FEAT_STFLE_45)) {
+ o->in1 = tcg_temp_new_i64();
+ if (non_atomic) {
tcg_gen_qemu_ld_tl(o->in1, o->addr1, get_mem_index(s), s->insn->data);
} else {
/* Perform the atomic addition in memory. */
@@ -1487,7 +1486,30 @@ static DisasJumpType op_asi(DisasContext *s, DisasOps *o)
/* Recompute also for atomic case: needed for setting CC. */
tcg_gen_add_i64(o->out, o->in1, o->in2);
- if (!s390_has_feat(S390_FEAT_STFLE_45)) {
+ if (non_atomic) {
+ tcg_gen_qemu_st_tl(o->out, o->addr1, get_mem_index(s), s->insn->data);
+ }
+ return DISAS_NEXT;
+}
+
+static DisasJumpType op_asiu64(DisasContext *s, DisasOps *o)
+{
+ bool non_atomic = !s390_has_feat(S390_FEAT_STFLE_45);
+
+ o->in1 = tcg_temp_new_i64();
+ if (non_atomic) {
+ tcg_gen_qemu_ld_tl(o->in1, o->addr1, get_mem_index(s), s->insn->data);
+ } else {
+ /* Perform the atomic addition in memory. */
+ tcg_gen_atomic_fetch_add_i64(o->in1, o->addr1, o->in2,
get_mem_index(s),
+ s->insn->data);
+ }
+
+ /* Recompute also for atomic case: needed for setting CC. */
+ tcg_gen_movi_i64(cc_src, 0);
+ tcg_gen_add2_i64(o->out, cc_src, o->in1, cc_src, o->in2, cc_src);
+
+ if (non_atomic) {
tcg_gen_qemu_st_tl(o->out, o->addr1, get_mem_index(s), s->insn->data);
}
return DISAS_NEXT;
@@ -5185,12 +5207,14 @@ static void cout_adds64(DisasContext *s, DisasOps *o)
static void cout_addu32(DisasContext *s, DisasOps *o)
{
- gen_op_update3_cc_i64(s, CC_OP_ADDU_32, o->in1, o->in2, o->out);
+ tcg_gen_shri_i64(cc_src, o->out, 32);
+ tcg_gen_ext32u_i64(cc_dst, o->out);
+ gen_op_update2_cc_i64(s, CC_OP_ADDU, cc_src, cc_dst);
}
static void cout_addu64(DisasContext *s, DisasOps *o)
{
- gen_op_update3_cc_i64(s, CC_OP_ADDU_64, o->in1, o->in2, o->out);
+ gen_op_update2_cc_i64(s, CC_OP_ADDU, cc_src, o->out);
}
static void cout_addc32(DisasContext *s, DisasOps *o)
@@ -5637,6 +5661,13 @@ static void in1_r2_sr32(DisasContext *s, DisasOps *o)
}
#define SPEC_in1_r2_sr32 0
+static void in1_r2_32u(DisasContext *s, DisasOps *o)
+{
+ o->in1 = tcg_temp_new_i64();
+ tcg_gen_ext32u_i64(o->in1, regs[get_field(s, r2)]);
+}
+#define SPEC_in1_r2_32u 0
+
static void in1_r3(DisasContext *s, DisasOps *o)
{
o->in1 = load_reg(get_field(s, r3));
diff --git a/target/s390x/insn-data.def b/target/s390x/insn-data.def
index b95bc98d35..5461e6aa3b 100644
--- a/target/s390x/insn-data.def
+++ b/target/s390x/insn-data.def
@@ -58,29 +58,29 @@
C(0xa70b, AGHI, RI_a, Z, r1, i2, r1, 0, add, adds64)
/* ADD LOGICAL */
- C(0x1e00, ALR, RR_a, Z, r1, r2, new, r1_32, add, addu32)
- C(0xb9fa, ALRK, RRF_a, DO, r2, r3, new, r1_32, add, addu32)
- C(0x5e00, AL, RX_a, Z, r1, m2_32u, new, r1_32, add, addu32)
- C(0xe35e, ALY, RXY_a, LD, r1, m2_32u, new, r1_32, add, addu32)
- C(0xb90a, ALGR, RRE, Z, r1, r2, r1, 0, add, addu64)
- C(0xb91a, ALGFR, RRE, Z, r1, r2_32u, r1, 0, add, addu64)
- C(0xb9ea, ALGRK, RRF_a, DO, r2, r3, r1, 0, add, addu64)
- C(0xe30a, ALG, RXY_a, Z, r1, m2_64, r1, 0, add, addu64)
- C(0xe31a, ALGF, RXY_a, Z, r1, m2_32u, r1, 0, add, addu64)
+ C(0x1e00, ALR, RR_a, Z, r1_32u, r2_32u, new, r1_32, add, addu32)
+ C(0xb9fa, ALRK, RRF_a, DO, r2_32u, r3_32u, new, r1_32, add, addu32)
+ C(0x5e00, AL, RX_a, Z, r1_32u, m2_32u, new, r1_32, add, addu32)
+ C(0xe35e, ALY, RXY_a, LD, r1_32u, m2_32u, new, r1_32, add, addu32)
+ C(0xb90a, ALGR, RRE, Z, r1, r2, r1, 0, addu64, addu64)
+ C(0xb91a, ALGFR, RRE, Z, r1, r2_32u, r1, 0, addu64, addu64)
+ C(0xb9ea, ALGRK, RRF_a, DO, r2, r3, r1, 0, addu64, addu64)
+ C(0xe30a, ALG, RXY_a, Z, r1, m2_64, r1, 0, addu64, addu64)
+ C(0xe31a, ALGF, RXY_a, Z, r1, m2_32u, r1, 0, addu64, addu64)
/* ADD LOGICAL HIGH */
C(0xb9ca, ALHHHR, RRF_a, HW, r2_sr32, r3_sr32, new, r1_32h, add, addu32)
- C(0xb9da, ALHHLR, RRF_a, HW, r2_sr32, r3, new, r1_32h, add, addu32)
+ C(0xb9da, ALHHLR, RRF_a, HW, r2_sr32, r3_32u, new, r1_32h, add, addu32)
/* ADD LOGICAL IMMEDIATE */
- C(0xc20b, ALFI, RIL_a, EI, r1, i2_32u, new, r1_32, add, addu32)
- C(0xc20a, ALGFI, RIL_a, EI, r1, i2_32u, r1, 0, add, addu64)
+ C(0xc20b, ALFI, RIL_a, EI, r1_32u, i2_32u, new, r1_32, add, addu32)
+ C(0xc20a, ALGFI, RIL_a, EI, r1, i2_32u, r1, 0, addu64, addu64)
/* ADD LOGICAL WITH SIGNED IMMEDIATE */
- D(0xeb6e, ALSI, SIY, GIE, la1, i2, new, 0, asi, addu32, MO_TEUL)
- C(0xecda, ALHSIK, RIE_d, DO, r3, i2, new, r1_32, add, addu32)
- D(0xeb7e, ALGSI, SIY, GIE, la1, i2, new, 0, asi, addu64, MO_TEQ)
- C(0xecdb, ALGHSIK, RIE_d, DO, r3, i2, r1, 0, add, addu64)
+ D(0xeb6e, ALSI, SIY, GIE, la1, i2_32u, new, 0, asi, addu32, MO_TEUL)
+ C(0xecda, ALHSIK, RIE_d, DO, r3_32u, i2_32u, new, r1_32, add, addu32)
+ C(0xeb7e, ALGSI, SIY, GIE, la1, i2, r1, 0, asiu64, addu64)
+ C(0xecdb, ALGHSIK, RIE_d, DO, r3, i2, r1, 0, addu64, addu64)
/* ADD LOGICAL WITH SIGNED IMMEDIATE HIGH */
- C(0xcc0a, ALSIH, RIL_a, HW, r1_sr32, i2, new, r1_32h, add, addu32)
- C(0xcc0b, ALSIHN, RIL_a, HW, r1_sr32, i2, new, r1_32h, add, 0)
+ C(0xcc0a, ALSIH, RIL_a, HW, r1_sr32, i2_32u, new, r1_32h, add, addu32)
+ C(0xcc0b, ALSIHN, RIL_a, HW, r1_sr32, i2_32u, new, r1_32h, add, 0)
/* ADD LOGICAL WITH CARRY */
C(0xb998, ALCR, RRE, Z, r1, r2, new, r1_32, addc, addc32)
C(0xb988, ALCGR, RRE, Z, r1, r2, r1, 0, addc, addc64)
--
2.25.1
- [PATCH v3 0/4] target/s390x: Improve carry computation, Richard Henderson, 2020/12/14
- [PATCH v3 1/4] target/s390x: Improve cc computation for ADD LOGICAL,
Richard Henderson <=
- [PATCH v3 2/4] target/s390x: Improve ADD LOGICAL WITH CARRY, Richard Henderson, 2020/12/14
- [PATCH v3 3/4] target/s390x: Improve cc computation for SUBTRACT LOGICAL, Richard Henderson, 2020/12/14
- [PATCH v3 4/4] target/s390x: Improve SUB LOGICAL WITH BORROW, Richard Henderson, 2020/12/14
- Re: [PATCH v3 0/4] target/s390x: Improve carry computation, David Hildenbrand, 2020/12/16
- Re: [PATCH v3 0/4] target/s390x: Improve carry computation, Cornelia Huck, 2020/12/16