Commit e201b564 authored by Richard Henderson's avatar Richard Henderson
Browse files

tcg/optimize: Simply some logical ops to NOT 



Given, of course, an appropriate constant.  These could be generated
from the "canonical" operation for inversion on the guest, or via
other optimizations.

Reviewed-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
Reviewed-by: default avatarAurelien Jarno <aurelien@aurel32.net>
Signed-off-by: default avatarRichard Henderson <rth@twiddle.net>
parent 23ec69ed

tcg/optimize.c

+57 −0
Original line number Diff line number Diff line
@@ -655,6 +655,63 @@ static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr, 
                }

            }

            break;

        CASE_OP_32_64(xor):

        CASE_OP_32_64(nand):

            if (temps[args[1]].state != TCG_TEMP_CONST

                && temps[args[2]].state == TCG_TEMP_CONST

                && temps[args[2]].val == -1) {

                i = 1;

                goto try_not;

            }

            break;

        CASE_OP_32_64(nor):

            if (temps[args[1]].state != TCG_TEMP_CONST

                && temps[args[2]].state == TCG_TEMP_CONST

                && temps[args[2]].val == 0) {

                i = 1;

                goto try_not;

            }

            break;

        CASE_OP_32_64(andc):

            if (temps[args[2]].state != TCG_TEMP_CONST

                && temps[args[1]].state == TCG_TEMP_CONST

                && temps[args[1]].val == -1) {

                i = 2;

                goto try_not;

            }

            break;

        CASE_OP_32_64(orc):

        CASE_OP_32_64(eqv):

            if (temps[args[2]].state != TCG_TEMP_CONST

                && temps[args[1]].state == TCG_TEMP_CONST

                && temps[args[1]].val == 0) {

                i = 2;

                goto try_not;

            }

            break;

        try_not:

            {

                TCGOpcode not_op;

                bool have_not;



                if (def->flags & TCG_OPF_64BIT) {

                    not_op = INDEX_op_not_i64;

                    have_not = TCG_TARGET_HAS_not_i64;

                } else {

                    not_op = INDEX_op_not_i32;

                    have_not = TCG_TARGET_HAS_not_i32;

                }

                if (!have_not) {

                    break;

                }

                s->gen_opc_buf[op_index] = not_op;

                reset_temp(args[0]);

                gen_args[0] = args[0];

                gen_args[1] = args[i];

                args += 3;

                gen_args += 2;

                continue;

            }

        default:

            break;

        }