Commit 8023ccda authored by Richard Henderson's avatar Richard Henderson
Browse files

tcg-i386: Try pc-relative lea for constant formation 



Use a 7 byte lea before the ultimate 10 byte movq.

Signed-off-by: default avatarRichard Henderson <rth@twiddle.net>
parent ac26eb69

tcg/i386/tcg-target.c

+20 −5
Original line number Diff line number Diff line
@@ -541,20 +541,35 @@ static inline void tcg_out_mov(TCGContext *s, TCGType type, 
static void tcg_out_movi(TCGContext *s, TCGType type,

                         TCGReg ret, tcg_target_long arg)

{

    tcg_target_long diff;



    if (arg == 0) {

        tgen_arithr(s, ARITH_XOR, ret, ret);

        return;

    } else if (arg == (uint32_t)arg || type == TCG_TYPE_I32) {

    }

    if (arg == (uint32_t)arg || type == TCG_TYPE_I32) {

        tcg_out_opc(s, OPC_MOVL_Iv + LOWREGMASK(ret), 0, ret, 0);

        tcg_out32(s, arg);

    } else if (arg == (int32_t)arg) {

        return;

    }

    if (arg == (int32_t)arg) {

        tcg_out_modrm(s, OPC_MOVL_EvIz + P_REXW, 0, ret);

        tcg_out32(s, arg);

    } else {

        return;

    }



    /* Try a 7 byte pc-relative lea before the 10 byte movq.  */

    diff = arg - ((tcg_target_long)s->code_ptr + 7);

    if (diff == (int32_t)diff) {

        tcg_out_opc(s, OPC_LEA | P_REXW, ret, 0, 0);

        tcg_out8(s, (LOWREGMASK(ret) << 3) | 5);

        tcg_out32(s, diff);

        return;

    }



    tcg_out_opc(s, OPC_MOVL_Iv + P_REXW + LOWREGMASK(ret), 0, ret, 0);

    tcg_out64(s, arg);

}

}



static inline void tcg_out_pushi(TCGContext *s, tcg_target_long val)

{