Commit f940fb08 authored by Richard Henderson's avatar Richard Henderson
Browse files

tcg-ia64: Use SUB_A3 and ADDS_A4 for subtraction 



We can subtract from more small constants that just 0 with one insn,
and we can add the negative for most small constants.

Acked-by: default avatarAurelien Jarno <aurelien@aurel32.net>
Signed-off-by: default avatarRichard Henderson <rth@twiddle.net>
parent 8642088a

tcg/ia64/tcg-target.c

+23 −2
Original line number Diff line number Diff line
@@ -1080,6 +1080,28 @@ static inline void tcg_out_add(TCGContext *s, TCGReg ret, TCGReg arg1, 
    }

}



static inline void tcg_out_sub(TCGContext *s, TCGReg ret, TCGArg arg1,

                               int const_arg1, TCGArg arg2, int const_arg2)

{

    if (const_arg1 && arg1 == (int8_t)arg1) {

        if (const_arg2) {

            tcg_out_movi(s, TCG_TYPE_I64, ret, arg1 - arg2);

            return;

        }

        tcg_out_bundle(s, mmI,

                       INSN_NOP_M,

                       INSN_NOP_M,

                       tcg_opc_a3(TCG_REG_P0, OPC_SUB_A3, ret, arg1, arg2));

    } else if (const_arg2 && -arg2 == sextract64(-arg2, 0, 14)) {

        tcg_out_bundle(s, mmI,

                       INSN_NOP_M,

                       INSN_NOP_M,

                       tcg_opc_a4(TCG_REG_P0, OPC_ADDS_A4, ret, -arg2, arg1));

    } else {

        tcg_out_alu(s, OPC_SUB_A1, ret, arg1, const_arg1, arg2, const_arg2);

    }

}



static inline void tcg_out_eqv(TCGContext *s, TCGArg ret,

                               TCGArg arg1, int const_arg1,

                               TCGArg arg2, int const_arg2)
@@ -2085,8 +2107,7 @@ static inline void tcg_out_op(TCGContext *s, TCGOpcode opc, 
        break;

    case INDEX_op_sub_i32:

    case INDEX_op_sub_i64:

        tcg_out_alu(s, OPC_SUB_A1, args[0], args[1], const_args[1],

                    args[2], const_args[2]);

        tcg_out_sub(s, args[0], args[1], const_args[1], args[2], const_args[2]);

        break;



    case INDEX_op_and_i32: