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target/s390x: Use tcg_gen_atomic_cmpxchg_i128 for CDSG 

Acked-by: Ilya Leoshkevich <iii@linux.ibm.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2022-11-09 13:54:35 +11:00
parent 2b91240f95
commit 1fcd84fa0d
4 changed files with 33 additions and 78 deletions
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2
target/s390x/helper.h
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@ -35,8 +35,6 @@ DEF_HELPER_3(cxgb, i128, env, s64, i32)
DEF_HELPER_3(celgb, i64, env, i64, i32)
DEF_HELPER_3(cdlgb, i64, env, i64, i32)
DEF_HELPER_3(cxlgb, i128, env, i64, i32)
DEF_HELPER_4(cdsg, void, env, i64, i32, i32)
DEF_HELPER_4(cdsg_parallel, void, env, i64, i32, i32)
DEF_HELPER_4(csst, i32, env, i32, i64, i64)
DEF_HELPER_4(csst_parallel, i32, env, i32, i64, i64)
DEF_HELPER_FLAGS_3(aeb, TCG_CALL_NO_WG, i64, env, i64, i64)

2
target/s390x/tcg/insn-data.h.inc
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@ -276,7 +276,7 @@
/* COMPARE DOUBLE AND SWAP */
D(0xbb00, CDS, RS_a, Z, r3_D32, r1_D32, new, r1_D32, cs, 0, MO_TEUQ)
D(0xeb31, CDSY, RSY_a, LD, r3_D32, r1_D32, new, r1_D32, cs, 0, MO_TEUQ)
C(0xeb3e, CDSG, RSY_a, Z, 0, 0, 0, 0, cdsg, 0)
C(0xeb3e, CDSG, RSY_a, Z, la2, r3_D64, 0, r1_D64, cdsg, 0)
/* COMPARE AND SWAP AND STORE */
C(0xc802, CSST, SSF, CASS, la1, a2, 0, 0, csst, 0)

52
target/s390x/tcg/mem_helper.c
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@ -1771,58 +1771,6 @@ uint32_t HELPER(trXX)(CPUS390XState *env, uint32_t r1, uint32_t r2,
return cc;
}
void HELPER(cdsg)(CPUS390XState *env, uint64_t addr,
uint32_t r1, uint32_t r3)
{
uintptr_t ra = GETPC();
Int128 cmpv = int128_make128(env->regs[r1 + 1], env->regs[r1]);
Int128 newv = int128_make128(env->regs[r3 + 1], env->regs[r3]);
Int128 oldv;
uint64_t oldh, oldl;
bool fail;
check_alignment(env, addr, 16, ra);
oldh = cpu_ldq_data_ra(env, addr + 0, ra);
oldl = cpu_ldq_data_ra(env, addr + 8, ra);
oldv = int128_make128(oldl, oldh);
fail = !int128_eq(oldv, cmpv);
if (fail) {
newv = oldv;
}
cpu_stq_data_ra(env, addr + 0, int128_gethi(newv), ra);
cpu_stq_data_ra(env, addr + 8, int128_getlo(newv), ra);
env->cc_op = fail;
env->regs[r1] = int128_gethi(oldv);
env->regs[r1 + 1] = int128_getlo(oldv);
}
void HELPER(cdsg_parallel)(CPUS390XState *env, uint64_t addr,
uint32_t r1, uint32_t r3)
{
uintptr_t ra = GETPC();
Int128 cmpv = int128_make128(env->regs[r1 + 1], env->regs[r1]);
Int128 newv = int128_make128(env->regs[r3 + 1], env->regs[r3]);
int mem_idx;
MemOpIdx oi;
Int128 oldv;
bool fail;
assert(HAVE_CMPXCHG128);
mem_idx = cpu_mmu_index(env, false);
oi = make_memop_idx(MO_TE | MO_128 | MO_ALIGN, mem_idx);
oldv = cpu_atomic_cmpxchgo_be_mmu(env, addr, cmpv, newv, oi, ra);
fail = !int128_eq(oldv, cmpv);
env->cc_op = fail;
env->regs[r1] = int128_gethi(oldv);
env->regs[r1 + 1] = int128_getlo(oldv);
}
static uint32_t do_csst(CPUS390XState *env, uint32_t r3, uint64_t a1,
uint64_t a2, bool parallel)
{

55
target/s390x/tcg/translate.c
View File

@ -2224,31 +2224,25 @@ static DisasJumpType op_cs(DisasContext *s, DisasOps *o)
static DisasJumpType op_cdsg(DisasContext *s, DisasOps *o)
{
int r1 = get_field(s, r1);
int r3 = get_field(s, r3);
int d2 = get_field(s, d2);
int b2 = get_field(s, b2);
DisasJumpType ret = DISAS_NEXT;
TCGv_i64 addr;
TCGv_i32 t_r1, t_r3;
/* Note that R1:R1+1 = expected value and R3:R3+1 = new value. */
addr = get_address(s, 0, b2, d2);
t_r1 = tcg_const_i32(r1);
t_r3 = tcg_const_i32(r3);
if (!(tb_cflags(s->base.tb) & CF_PARALLEL)) {
gen_helper_cdsg(cpu_env, addr, t_r1, t_r3);
} else if (HAVE_CMPXCHG128) {
gen_helper_cdsg_parallel(cpu_env, addr, t_r1, t_r3);
} else {
gen_helper_exit_atomic(cpu_env);
ret = DISAS_NORETURN;
}
tcg_temp_free_i64(addr);
tcg_temp_free_i32(t_r1);
tcg_temp_free_i32(t_r3);
o->out_128 = tcg_temp_new_i128();
tcg_gen_concat_i64_i128(o->out_128, regs[r1 + 1], regs[r1]);
set_cc_static(s);
return ret;
/* Note out (R1:R1+1) = expected value and in2 (R3:R3+1) = new value. */
tcg_gen_atomic_cmpxchg_i128(o->out_128, o->addr1, o->out_128, o->in2_128,
get_mem_index(s), MO_BE | MO_128 | MO_ALIGN);
/*
* Extract result into cc_dst:cc_src, compare vs the expected value
* in the as yet unmodified input registers, then update CC_OP.
*/
tcg_gen_extr_i128_i64(cc_src, cc_dst, o->out_128);
tcg_gen_xor_i64(cc_dst, cc_dst, regs[r1]);
tcg_gen_xor_i64(cc_src, cc_src, regs[r1 + 1]);
tcg_gen_or_i64(cc_dst, cc_dst, cc_src);
set_cc_nz_u64(s, cc_dst);
return DISAS_NEXT;
}
static DisasJumpType op_csst(DisasContext *s, DisasOps *o)
@ -5488,6 +5482,13 @@ static void wout_r1_D32(DisasContext *s, DisasOps *o)
}
#define SPEC_wout_r1_D32 SPEC_r1_even
static void wout_r1_D64(DisasContext *s, DisasOps *o)
{
int r1 = get_field(s, r1);
tcg_gen_extr_i128_i64(regs[r1 + 1], regs[r1], o->out_128);
}
#define SPEC_wout_r1_D64 SPEC_r1_even
static void wout_r3_P32(DisasContext *s, DisasOps *o)
{
int r3 = get_field(s, r3);
@ -5935,6 +5936,14 @@ static void in2_r3(DisasContext *s, DisasOps *o)
}
#define SPEC_in2_r3 0
static void in2_r3_D64(DisasContext *s, DisasOps *o)
{
int r3 = get_field(s, r3);
o->in2_128 = tcg_temp_new_i128();
tcg_gen_concat_i64_i128(o->in2_128, regs[r3 + 1], regs[r3]);
}
#define SPEC_in2_r3_D64 SPEC_r3_even
static void in2_r3_sr32(DisasContext *s, DisasOps *o)
{
o->in2 = tcg_temp_new_i64();