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Fix shift/lmo insns; Subu does arithmetic unsigned

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This commit is contained in:
Michael Meissner
1997-05-11 14:32:32 +00:00
parent 20b2f9bc83
commit 450be2349a
4 changed files with 88 additions and 24 deletions
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35
sim/tic80/insns
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@ -706,7 +706,7 @@ void::function::do_ld_u:unsigned32 *rDest, unsigned32 Base, unsigned32 *rBase, i
// lmo
31.Dest,26.Source,21.111111000,12.0,11./::::lmo
31.Dest,26.Source,21.0b111111000,12.0,11./::::lmo
int b;
for (b = 0; b < 32; b++)
if (rSource & BIT32 (31 - b))
@ -820,7 +820,7 @@ void::function::do_shift:int Dest, int Source, int Merge, int i, int n, int EndM
}
/* form the end mask */
if (EndMask == 0)
endmask = -1;
endmask = ~ (unsigned32)0;
else
endmask = (1 << EndMask) - 1;
if (i)
@ -829,13 +829,13 @@ void::function::do_shift:int Dest, int Source, int Merge, int i, int n, int EndM
switch (Merge)
{
case 0: case 1: case 2:
shiftmask = -1; /* disabled */
shiftmask = ~ (unsigned32)0; /* disabled */
break;
case 3: case 4: case 5:
shiftmask = ((1 << nRotate) - 1); /* enabled */
shiftmask = ((1 << nRotate) - 1); /* enabled */
break;
case 6: case 7:
shiftmask = ~((1 << nRotate) - 1); /* inverted */
shiftmask = ~((1 << nRotate) - 1); /* inverted */
break;
default:
engine_error (SD, CPU, cia,
@ -848,13 +848,13 @@ void::function::do_shift:int Dest, int Source, int Merge, int i, int n, int EndM
/* and merge */
switch (Merge)
{
case 0: case 3: case 6: /* zero */
case 0: case 3: case 6: /* zero */
GPR (Dest) = rotated & cm;
break;
case 1: case 4: case 7: /* merge */
case 1: case 4: case 7: /* merge */
GPR (Dest) = (rotated & cm) | (GPR (Dest) & ~cm);
break;
case 2: case 5: /* sign */
case 2: case 5: /* sign */
{
int b;
GPR (Dest) = rotated & cm;
@ -870,22 +870,11 @@ void::function::do_shift:int Dest, int Source, int Merge, int i, int n, int EndM
cia.ip, Source);
}
TRACE_ALU2 (MY_INDEX, GPR (Dest), input);
TRACE_SHIFT (MY_INDEX, GPR (Dest), input, i, n, Merge, EndMask, Rotate);
31.Dest,26.Source,21.0b0001,17.Merge,14./,11.i,10.n,9.EndMask,4.Rotate::::sl i
do_shift (_SD, Dest, Source, Merge, i, n, EndMask, Rotate);
31.Dest,26.Source,21.0b110001,15.Merge,12.0,11.i,10.n,9.EndMask,4.RotReg::::sl r
int endmask;
if (EndMask == 0)
endmask = EndMask;
else
{
if (Source & 1)
engine_error (SD, CPU, cia,
"0x%lx: Invalid source (%d) for shift",
cia.ip, Source);
endmask = GPR (Source + 1) & 31;
}
do_shift (_SD, Dest, Source, Merge, i, n, endmask, GPR (RotReg) & 31);
do_shift (_SD, Dest, Source, Merge, i, n, EndMask, GPR (RotReg) & 31);
// sli.{d|e|i}{m|s|z} - see shift
@ -959,12 +948,12 @@ void::function::do_sub:signed32 *rDest, signed32 Source1, signed32 Source2
// subu
void::function::do_subu:signed32 *rDest, signed32 Source1, signed32 Source2
void::function::do_subu:unsigned32 *rDest, unsigned32 Source1, signed32 Source2
unsigned32 result = Source1 - Source2;
TRACE_ALU3 (MY_INDEX, result, Source1, Source2);
*rDest = result;
// NOTE - the book has 15.1 which conflicts with subu.
31.Dest,26.Source2,21.0b101101,15.1,14.SignedImmediate::::subu i
31.Dest,26.Source2,21.0b101101,15.1,14.UnsignedImmediate::::subu i
do_subu (_SD, rDest, vSource1, rSource2);
31.Dest,26.Source2,21.0b11101101,13.1,12.0,11./,4.Source1::::subu r
do_subu (_SD, rDest, rSource1, rSource2);