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val extern ( nat * nat ) -> nat effect pure (deinfix + ) = "add"
(* XXX type is wrong *)
val extern ( bit * bit ) -> bit effect pure (deinfix : ) = "vec_concat"
val extern forall Type 'a . ( 'a * 'a ) -> bool effect pure (deinfix != ) = "neq"
val extern bit -> bit effect pure (deinfix ~ ) = "bitwise-not"
val extern ( bit * bit ) -> bit effect pure (deinfix ^ ) = "bitwise-xor"
val extern ( bit * bit ) -> bit effect pure (deinfix & ) = "bitwise-and"
val extern bit -> bool effect pure is_one = "is_one"
(* XXX sign extension *)
function forall Type 'a . 'a exts ( x ) = x
register (bit[32]) NIA (* next instruction address *)
register (bit[32]) CIA (* current instruction address *)
register bool mode64bit
scattered function unit execute
scattered typedef ast = const union
scattered function ast decode
union ast member bit (* AA *) * bit [ 23 ] (* LI *) * bit (* LK *) Branch
function clause decode (([ 0 = bitzero, 1 = bitone, 2 = bitzero, 3 = bitzero, 4 = bitone, 5 = bitzero ] as instr)) =
Branch ( instr[30] (* AA *), instr[6..29] (* LI *), instr[31] (* LK *) )
function clause execute ( Branch ( AA, LI, LK ) ) =
{
if AA then NIA := ( exts ( ( LI : 0b00 ) )) else NIA := ( CIA + ( exts ( ( LI : 0b00 ) )) ) ;
if LK then LR := ( CIA + 4 ) ;
}
union ast member bit (* AA *) * bit [ 13 ] (* BD *) * bit [ 4 ] (* BI *) * bit [ 4 ] (* BO *) * bit (* LK *) BranchConditional
function clause decode (([ 0 = bitzero, 1 = bitone, 2 = bitzero, 3 = bitzero, 4 = bitzero, 5 = bitzero ] as instr)) =
BranchConditional ( instr[30] (* AA *), instr[16..29] (* BD *), instr[11..15] (* BI *), instr[6..10] (* BO *), instr[31] (* LK *) )
function clause execute ( BranchConditional ( AA, BD, BI, BO, LK ) ) =
{
if mode64bit then M := 0 else M := 32 ;
if ( ~ ( (( BO )[ 2 ]) )) then CTR := ( CTR - 1 ) ;
ctr_ok := ( (( BO )[ 2 ]) | ( ( (( CTR )[ M .. 63 ]) != 0 ) ^ (( BO )[ 3 ]) ) ) ;
cond_ok := ( (( BO )[ 0 ]) | ( (( CR )[ ( BI + 32 ) ]) ^ ( ~ ( (( BO )[ 1 ]) )) ) ) ;
if ( ctr_ok & cond_ok ) then {
if AA then NIA := ( exts ( ( BD : 0b00 ) )) else NIA := ( CIA + ( exts ( ( BD : 0b00 ) )) ) ;
} ;
if LK then LR := ( CIA + 4 ) ;
}
union ast member bit [ 1 ] (* BH *) * bit [ 4 ] (* BI *) * bit [ 4 ] (* BO *) * bit (* LK *) BranchConditionaltoLinkRegister
function clause decode (([ 0 = bitzero, 1 = bitone, 2 = bitzero, 3 = bitzero, 4 = bitone, 5 = bitone, 21 = bitzero, 22 = bitzero, 23 = bitzero, 24 = bitzero, 25 = bitzero, 26 = bitone, 27 = bitzero, 28 = bitzero, 29 = bitzero, 30 = bitzero ] as instr)) =
BranchConditionaltoLinkRegister ( instr[19..20] (* BH *), instr[11..15] (* BI *), instr[6..10] (* BO *), instr[31] (* LK *) )
function clause execute ( BranchConditionaltoLinkRegister ( BH, BI, BO, LK ) ) =
{
if mode64bit then M := 0 else M := 32 ;
if ( ~ ( (( BO )[ 2 ]) )) then CTR := ( CTR - 1 ) ;
ctr_ok := ( (( BO )[ 2 ]) | ( ( (( CTR )[ M .. 63 ]) != 0 ) ^ (( BO )[ 3 ]) ) ) ;
cond_ok := ( (( BO )[ 0 ]) | ( (( CR )[ ( BI + 32 ) ]) ^ ( ~ ( (( BO )[ 1 ]) )) ) ) ;
if ( ctr_ok & cond_ok ) then NIA := ( (( LR )[ 0 .. 61 ]) : 0b00 ) ;
if LK then LR := ( CIA + 4 ) ;
}
union ast member bit [ 1 ] (* BH *) * bit [ 4 ] (* BI *) * bit [ 4 ] (* BO *) * bit (* LK *) BranchConditionaltoCountRegister
function clause decode (([ 0 = bitzero, 1 = bitone, 2 = bitzero, 3 = bitzero, 4 = bitone, 5 = bitone, 21 = bitone, 22 = bitzero, 23 = bitzero, 24 = bitzero, 25 = bitzero, 26 = bitone, 27 = bitzero, 28 = bitzero, 29 = bitzero, 30 = bitzero ] as instr)) =
BranchConditionaltoCountRegister ( instr[19..20] (* BH *), instr[11..15] (* BI *), instr[6..10] (* BO *), instr[31] (* LK *) )
function clause execute ( BranchConditionaltoCountRegister ( BH, BI, BO, LK ) ) =
{
cond_ok := ( (( BO )[ 0 ]) | ( (( CR )[ ( BI + 32 ) ]) ^ ( ~ ( (( BO )[ 1 ]) )) ) ) ;
if cond_ok then NIA := ( (( CTR )[ 0 .. 61 ]) : 0b00 ) ;
if LK then LR := ( CIA + 4 ) ;
}
union ast member bit [ 4 ] (* BA *) * bit [ 4 ] (* BB *) * bit [ 4 ] (* BT *) ConditionRegisterAND
function clause decode (([ 0 = bitzero, 1 = bitone, 2 = bitzero, 3 = bitzero, 4 = bitone, 5 = bitone, 21 = bitzero, 22 = bitone, 23 = bitzero, 24 = bitzero, 25 = bitzero, 26 = bitzero, 27 = bitzero, 28 = bitzero, 29 = bitzero, 30 = bitone ] as instr)) =
ConditionRegisterAND ( instr[11..15] (* BA *), instr[16..20] (* BB *), instr[6..10] (* BT *) )
function clause execute ( ConditionRegisterAND ( BA, BB, BT ) ) =
( CR )[ ( BT + 32 ) ] := ( (( CR )[ ( BA + 32 ) ]) & (( CR )[ ( BB + 32 ) ]) )
union ast member bit [ 4 ] (* BA *) * bit [ 4 ] (* BB *) * bit [ 4 ] (* BT *) ConditionRegisterNAND
function clause decode (([ 0 = bitzero, 1 = bitone, 2 = bitzero, 3 = bitzero, 4 = bitone, 5 = bitone, 21 = bitzero, 22 = bitzero, 23 = bitone, 24 = bitone, 25 = bitone, 26 = bitzero, 27 = bitzero, 28 = bitzero, 29 = bitzero, 30 = bitone ] as instr)) =
ConditionRegisterNAND ( instr[11..15] (* BA *), instr[16..20] (* BB *), instr[6..10] (* BT *) )
function clause execute ( ConditionRegisterNAND ( BA, BB, BT ) ) =
( CR )[ ( BT + 32 ) ] := ( ~ ( ( (( CR )[ ( BA + 32 ) ]) & (( CR )[ ( BB + 32 ) ]) ) ))
union ast member bit [ 4 ] (* BA *) * bit [ 4 ] (* BB *) * bit [ 4 ] (* BT *) ConditionRegisterOR
function clause decode (([ 0 = bitzero, 1 = bitone, 2 = bitzero, 3 = bitzero, 4 = bitone, 5 = bitone, 21 = bitzero, 22 = bitone, 23 = bitone, 24 = bitone, 25 = bitzero, 26 = bitzero, 27 = bitzero, 28 = bitzero, 29 = bitzero, 30 = bitone ] as instr)) =
ConditionRegisterOR ( instr[11..15] (* BA *), instr[16..20] (* BB *), instr[6..10] (* BT *) )
function clause execute ( ConditionRegisterOR ( BA, BB, BT ) ) =
( CR )[ ( BT + 32 ) ] := ( (( CR )[ ( BA + 32 ) ]) | (( CR )[ ( BB + 32 ) ]) )
union ast member bit [ 4 ] (* BA *) * bit [ 4 ] (* BB *) * bit [ 4 ] (* BT *) ConditionRegisterXOR
function clause decode (([ 0 = bitzero, 1 = bitone, 2 = bitzero, 3 = bitzero, 4 = bitone, 5 = bitone, 21 = bitzero, 22 = bitzero, 23 = bitone, 24 = bitone, 25 = bitzero, 26 = bitzero, 27 = bitzero, 28 = bitzero, 29 = bitzero, 30 = bitone ] as instr)) =
ConditionRegisterXOR ( instr[11..15] (* BA *), instr[16..20] (* BB *), instr[6..10] (* BT *) )
function clause execute ( ConditionRegisterXOR ( BA, BB, BT ) ) =
( CR )[ ( BT + 32 ) ] := ( (( CR )[ ( BA + 32 ) ]) ^ (( CR )[ ( BB + 32 ) ]) )
union ast member bit [ 4 ] (* BA *) * bit [ 4 ] (* BB *) * bit [ 4 ] (* BT *) ConditionRegisterNOR
function clause decode (([ 0 = bitzero, 1 = bitone, 2 = bitzero, 3 = bitzero, 4 = bitone, 5 = bitone, 21 = bitzero, 22 = bitzero, 23 = bitzero, 24 = bitzero, 25 = bitone, 26 = bitzero, 27 = bitzero, 28 = bitzero, 29 = bitzero, 30 = bitone ] as instr)) =
ConditionRegisterNOR ( instr[11..15] (* BA *), instr[16..20] (* BB *), instr[6..10] (* BT *) )
function clause execute ( ConditionRegisterNOR ( BA, BB, BT ) ) =
( CR )[ ( BT + 32 ) ] := ( ~ ( ( (( CR )[ ( BA + 32 ) ]) | (( CR )[ ( BB + 32 ) ]) ) ))
union ast member bit [ 4 ] (* BA *) * bit [ 4 ] (* BB *) * bit [ 4 ] (* BT *) ConditionRegisterEquivalent
function clause decode (([ 0 = bitzero, 1 = bitone, 2 = bitzero, 3 = bitzero, 4 = bitone, 5 = bitone, 21 = bitzero, 22 = bitone, 23 = bitzero, 24 = bitzero, 25 = bitone, 26 = bitzero, 27 = bitzero, 28 = bitzero, 29 = bitzero, 30 = bitone ] as instr)) =
ConditionRegisterEquivalent ( instr[11..15] (* BA *), instr[16..20] (* BB *), instr[6..10] (* BT *) )
function clause execute ( ConditionRegisterEquivalent ( BA, BB, BT ) ) =
( CR )[ ( BT + 32 ) ] := ( (( CR )[ ( BA + 32 ) ]) ^ ( ~ ( (( CR )[ ( BB + 32 ) ]) )) )
union ast member bit [ 4 ] (* BA *) * bit [ 4 ] (* BB *) * bit [ 4 ] (* BT *) ConditionRegisterANDwithComplement
function clause decode (([ 0 = bitzero, 1 = bitone, 2 = bitzero, 3 = bitzero, 4 = bitone, 5 = bitone, 21 = bitzero, 22 = bitzero, 23 = bitone, 24 = bitzero, 25 = bitzero, 26 = bitzero, 27 = bitzero, 28 = bitzero, 29 = bitzero, 30 = bitone ] as instr)) =
ConditionRegisterANDwithComplement ( instr[11..15] (* BA *), instr[16..20] (* BB *), instr[6..10] (* BT *) )
function clause execute ( ConditionRegisterANDwithComplement ( BA, BB, BT ) ) =
( CR )[ ( BT + 32 ) ] := ( (( CR )[ ( BA + 32 ) ]) & ( ~ ( (( CR )[ ( BB + 32 ) ]) )) )
union ast member bit [ 4 ] (* BA *) * bit [ 4 ] (* BB *) * bit [ 4 ] (* BT *) ConditionRegisterORwithComplement
function clause decode (([ 0 = bitzero, 1 = bitone, 2 = bitzero, 3 = bitzero, 4 = bitone, 5 = bitone, 21 = bitzero, 22 = bitone, 23 = bitone, 24 = bitzero, 25 = bitone, 26 = bitzero, 27 = bitzero, 28 = bitzero, 29 = bitzero, 30 = bitone ] as instr)) =
ConditionRegisterORwithComplement ( instr[11..15] (* BA *), instr[16..20] (* BB *), instr[6..10] (* BT *) )
function clause execute ( ConditionRegisterORwithComplement ( BA, BB, BT ) ) =
( CR )[ ( BT + 32 ) ] := ( (( CR )[ ( BA + 32 ) ]) | ( ~ ( (( CR )[ ( BB + 32 ) ]) )) )
union ast member bit [ 2 ] (* BF *) * bit [ 2 ] (* BFA *) MoveConditionRegisterField
function clause decode (([ 0 = bitzero, 1 = bitone, 2 = bitzero, 3 = bitzero, 4 = bitone, 5 = bitone, 21 = bitzero, 22 = bitzero, 23 = bitzero, 24 = bitzero, 25 = bitzero, 26 = bitzero, 27 = bitzero, 28 = bitzero, 29 = bitzero, 30 = bitzero ] as instr)) =
MoveConditionRegisterField ( instr[6..8] (* BF *), instr[11..13] (* BFA *) )
function clause execute ( MoveConditionRegisterField ( BF, BFA ) ) =
( CR )[ ( ( 4 * BF ) + 32 ) .. ( ( 4 * BF ) + 35 ) ] := (( CR )[ ( ( 4 * BFA ) + 32 ) .. ( ( 4 * BFA ) + 35 ) ])
union ast member bit [ 6 ] (* LEV *) SystemCall
function clause decode (([ 0 = bitzero, 1 = bitone, 2 = bitzero, 3 = bitzero, 4 = bitzero, 5 = bitone, 30 = bitone ] as instr)) =
SystemCall ( instr[20..26] (* LEV *) )
function clause execute ( SystemCall ( LEV ) ) =
()
union ast member bit [ 6 ] (* LEV *) SystemCallVectored
function clause decode (([ 0 = bitzero, 1 = bitone, 2 = bitzero, 3 = bitzero, 4 = bitzero, 5 = bitone, 30 = bitzero, 31 = bitone ] as instr)) =
SystemCallVectored ( instr[20..26] (* LEV *) )
function clause execute ( SystemCallVectored ( LEV ) ) =
()
end decode
end execute
end ast
function unit main _ = {
(* init *)
CIA := 0b0;
NIA := 0b0;
(* should decode as Branch *)
execute(decode(0b01001000000000000000000000000000));
()
}
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