Commit 8bcb5c8f authored by Aurelien Jarno's avatar Aurelien Jarno Committed by Richard Henderson
Browse files

tcg/optimize: add optimizations for ext_i32_i64 and extu_i32_i64 ops 



They behave the same as ext32s_i64 and ext32u_i64 from the constant
folding and zero propagation point of view, except that they can't
be replaced by a mov, so we don't compute the affected value.

Signed-off-by: default avatarAurelien Jarno <aurelien@aurel32.net>
Signed-off-by: default avatarRichard Henderson <rth@twiddle.net>
parent 4f2331e5

tcg/optimize.c

+13 −0
Original line number Diff line number Diff line
@@ -343,9 +343,11 @@ static TCGArg do_constant_folding_2(TCGOpcode op, TCGArg x, TCGArg y) 
    CASE_OP_32_64(ext16u):

        return (uint16_t)x;



    case INDEX_op_ext_i32_i64:

    case INDEX_op_ext32s_i64:

        return (int32_t)x;



    case INDEX_op_extu_i32_i64:

    case INDEX_op_ext32u_i64:

        return (uint32_t)x;
@@ -837,6 +839,15 @@ void tcg_optimize(TCGContext *s) 
            mask = temps[args[1]].mask & mask;

            break;



        case INDEX_op_ext_i32_i64:

            if ((temps[args[1]].mask & 0x80000000) != 0) {

                break;

            }

        case INDEX_op_extu_i32_i64:

            /* We do not compute affected as it is a size changing op.  */

            mask = (uint32_t)temps[args[1]].mask;

            break;



        CASE_OP_32_64(andc):

            /* Known-zeros does not imply known-ones.  Therefore unless

               args[2] is constant, we can't infer anything from it.  */
@@ -1015,6 +1026,8 @@ void tcg_optimize(TCGContext *s) 
        CASE_OP_32_64(ext16u):

        case INDEX_op_ext32s_i64:

        case INDEX_op_ext32u_i64:

        case INDEX_op_ext_i32_i64:

        case INDEX_op_extu_i32_i64:

            if (temp_is_const(args[1])) {

                tmp = do_constant_folding(opc, temps[args[1]].val, 0);

                tcg_opt_gen_movi(s, op, args, args[0], tmp);