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Implements a missing form of BTST.

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This commit is contained in:
Thomas Harte 2019-04-28 23:20:50 -04:00
parent d9278e9827
commit 412f091d76
1 changed files with 10 additions and 7 deletions
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17
Processors/68000/Implementation/68000Storage.cpp
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@ -1739,6 +1739,9 @@ struct ProcessorStorageConstructor {
op(Action::PerformOperation, is_bclr ? seq("nw", { a(ea_register) }, false) : nullptr);
break;
case XXXl: // BTST.b Dn, (xxx).l
op(Action::None, seq("np"));
case XXXw: // BTST.b Dn, (xxx).w
case d16An: // BTST.b Dn, (d16, An)
case d8AnXn: // BTST.b Dn, (d8, An, Xn)
case d16PC: // BTST.b Dn, (d16, PC)
@ -1746,17 +1749,17 @@ struct ProcessorStorageConstructor {
// PC-relative addressing isn't support for BCLR.
if((mode == d16PC || mode == d8PCXn) && is_bclr) continue;
op( calc_action_for_mode(mode) | MicroOp::DestinationMask,
op( address_action_for_mode(mode) | MicroOp::DestinationMask,
seq(pseq("np nrd np", mode), { ea(1) }, false));
op(Action::PerformOperation, is_bclr ? seq("nw", { ea(1) }, false) : nullptr);
break;
case XXXl: // BTST.b Dn, (xxx).l
op(Action::None, seq("np"));
case XXXw: // BTST.b Dn, (xxx).w
op( address_assemble_for_mode(mode) | MicroOp::DestinationMask,
seq("np nrd np", { ea(1) }, false));
op(Action::PerformOperation, is_bclr ? seq("nw", { ea(1) }, false) : nullptr);
case Imm: // BTST.b Dn, #
if(is_bclr) continue;
/* Yacht.txt doesn't cover this; this is a guess. */
op(int(Action::AssembleWordDataFromPrefetch) | MicroOp::DestinationMask, seq("np"));
op(Action::PerformOperation, seq("np"));
break;
}
} break;