Commit 60e57346 authored by Emilio G. Cota's avatar Emilio G. Cota Committed by Richard Henderson
Browse files

target-i386: emulate LOCK'ed INC using atomic helper 



[rth: Merge gen_inc_locked back into gen_inc to share cc update.]

Signed-off-by: default avatarEmilio G. Cota <cota@braap.org>
Message-Id: <1467054136-10430-14-git-send-email-cota@braap.org>
Signed-off-by: default avatarRichard Henderson <rth@twiddle.net>
parent a7cee522

target-i386/translate.c

+13 −11
Original line number Diff line number Diff line
@@ -1361,21 +1361,23 @@ static void gen_op(DisasContext *s1, int op, TCGMemOp ot, int d) 
/* if d == OR_TMP0, it means memory operand (address in A0) */

static void gen_inc(DisasContext *s1, TCGMemOp ot, int d, int c)

{

    if (s1->prefix & PREFIX_LOCK) {

        tcg_gen_movi_tl(cpu_T0, c > 0 ? 1 : -1);

        tcg_gen_atomic_add_fetch_tl(cpu_T0, cpu_A0, cpu_T0,

                                    s1->mem_index, ot | MO_LE);

    } else {

        if (d != OR_TMP0) {

            gen_op_mov_v_reg(ot, cpu_T0, d);

        } else {

            gen_op_ld_v(s1, ot, cpu_T0, cpu_A0);

        }

    gen_compute_eflags_c(s1, cpu_cc_src);

    if (c > 0) {

        tcg_gen_addi_tl(cpu_T0, cpu_T0, 1);

        set_cc_op(s1, CC_OP_INCB + ot);

    } else {

        tcg_gen_addi_tl(cpu_T0, cpu_T0, -1);

        set_cc_op(s1, CC_OP_DECB + ot);

    }

        tcg_gen_addi_tl(cpu_T0, cpu_T0, (c > 0 ? 1 : -1));

        gen_op_st_rm_T0_A0(s1, ot, d);

    }



    gen_compute_eflags_c(s1, cpu_cc_src);

    tcg_gen_mov_tl(cpu_cc_dst, cpu_T0);

    set_cc_op(s1, (c > 0 ? CC_OP_INCB : CC_OP_DECB) + ot);

}



static void gen_shift_flags(DisasContext *s, TCGMemOp ot, TCGv result,