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target/i386: convert XADD to new decoder

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Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2024-05-14 16:40:32 +02:00
parent 11ffaf8c73
commit 7b1f25ac3a
3 changed files with 26 additions and 36 deletions
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3
target/i386/tcg/decode-new.c.inc
View file

@ -1171,6 +1171,8 @@ static const X86OpEntry opcodes_0F[256] = {
[0xb6] = X86_OP_ENTRY3(MOV, G,v, E,b, None, None, zextT0), /* MOVZX */
[0xb7] = X86_OP_ENTRY3(MOV, G,v, E,w, None, None, zextT0), /* MOVZX */
[0xc0] = X86_OP_ENTRY2(XADD, E,b, G,b, lock),
[0xc1] = X86_OP_ENTRY2(XADD, E,v, G,v, lock),
[0xc2] = X86_OP_ENTRY4(VCMP, V,x, H,x, W,x, vex2_rep3 p_00_66_f3_f2),
[0xc3] = X86_OP_ENTRY3(MOV, EM,y,G,y, None,None, cpuid(SSE2)), /* MOVNTI */
[0xc4] = X86_OP_ENTRY4(PINSRW, V,dq,H,dq,E,w, vex5 mmx p_00_66),
@ -2598,7 +2600,6 @@ static void disas_insn(DisasContext *s, CPUState *cpu)
case 0xb0 ... 0xb1: /* cmpxchg */
case 0xb3: /* btr */
case 0xba ... 0xbb: /* grp8, btc */
case 0xc0 ... 0xc1: /* xadd */
case 0xc7: /* grp9 */
disas_insn_old(s, cpu, b + 0x100);
return;

24
target/i386/tcg/emit.c.inc
View file

@ -4372,6 +4372,30 @@ static void gen_WRxxBASE(DisasContext *s, X86DecodedInsn *decode)
tcg_gen_mov_tl(base, s->T0);
}
static void gen_XADD(DisasContext *s, X86DecodedInsn *decode)
{
MemOp ot = decode->op[1].ot;
decode->cc_dst = tcg_temp_new();
decode->cc_src = s->T1;
decode->cc_op = CC_OP_ADDB + ot;
if (s->prefix & PREFIX_LOCK) {
tcg_gen_atomic_fetch_add_tl(s->T0, s->A0, s->T1, s->mem_index, ot | MO_LE);
tcg_gen_add_tl(decode->cc_dst, s->T0, s->T1);
} else {
tcg_gen_add_tl(decode->cc_dst, s->T0, s->T1);
/*
* NOTE: writing memory first is important for MMU exceptions,
* but "new result" wins for XADD AX, AX.
*/
gen_writeback(s, decode, 0, decode->cc_dst);
}
if (decode->op[0].has_ea || decode->op[2].n != decode->op[0].n) {
gen_writeback(s, decode, 2, s->T0);
}
}
static void gen_XCHG(DisasContext *s, X86DecodedInsn *decode)
{
if (s->prefix & PREFIX_LOCK) {

35
target/i386/tcg/translate.c
View file

@ -823,12 +823,6 @@ static void gen_movs(DisasContext *s, MemOp ot)
gen_op_add_reg(s, s->aflag, R_EDI, dshift);
}
static void gen_op_update2_cc(DisasContext *s)
{
tcg_gen_mov_tl(cpu_cc_src, s->T1);
tcg_gen_mov_tl(cpu_cc_dst, s->T0);
}
/* compute all eflags to reg */
static void gen_mov_eflags(DisasContext *s, TCGv reg)
{
@ -3011,35 +3005,6 @@ static void disas_insn_old(DisasContext *s, CPUState *cpu, int b)
switch (b) {
/**************************/
/* arith & logic */
case 0x1c0:
case 0x1c1: /* xadd Ev, Gv */
ot = mo_b_d(b, dflag);
modrm = x86_ldub_code(env, s);
reg = ((modrm >> 3) & 7) | REX_R(s);
mod = (modrm >> 6) & 3;
gen_op_mov_v_reg(s, ot, s->T0, reg);
if (mod == 3) {
rm = (modrm & 7) | REX_B(s);
gen_op_mov_v_reg(s, ot, s->T1, rm);
tcg_gen_add_tl(s->T0, s->T0, s->T1);
gen_op_mov_reg_v(s, ot, reg, s->T1);
gen_op_mov_reg_v(s, ot, rm, s->T0);
} else {
gen_lea_modrm(env, s, modrm);
if (s->prefix & PREFIX_LOCK) {
tcg_gen_atomic_fetch_add_tl(s->T1, s->A0, s->T0,
s->mem_index, ot | MO_LE);
tcg_gen_add_tl(s->T0, s->T0, s->T1);
} else {
gen_op_ld_v(s, ot, s->T1, s->A0);
tcg_gen_add_tl(s->T0, s->T0, s->T1);
gen_op_st_v(s, ot, s->T0, s->A0);
}
gen_op_mov_reg_v(s, ot, reg, s->T1);
}
gen_op_update2_cc(s);
set_cc_op(s, CC_OP_ADDB + ot);
break;
case 0x1b0:
case 0x1b1: /* cmpxchg Ev, Gv */
{