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reverse bit number for bbo/bbz instructions.

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This commit is contained in:
Michael Meissner 1997-05-08 19:58:20 +00:00
parent 53dcd669e5
commit 1e0e7911a5
2 changed files with 3 additions and 2 deletions
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1
sim/tic80/ChangeLog
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@ -3,6 +3,7 @@ Thu May 8 11:57:47 1997 Michael Meissner <meissner@cygnus.com>
* insns (jsr,bsr): For non-allulled calls, set r31 so that the
return address does not reexecute the instruction in the delay
slot.
(bbo,bbz): Reverse bit number.
* misc.c (tic80_trace_*): Change format slightly to accomidate
real large decimal values.

4
sim/tic80/insns
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@ -107,7 +107,7 @@ void::function::do_and:signed32 *rDest, signed32 Source1, signed32 Source2
instruction_address::function::do_bbo:instruction_address nia, int bitnum, unsigned32 source, int annul, unsigned32 offset
int jump_p;
unsigned32 target = cia.ip + 4 * offset;
if (MASKED32 (source, bitnum, bitnum))
if (MASKED32 (source, 32 - bitnum, 32 - bitnum))
{
if (annul)
nia.ip = -1;
@ -131,7 +131,7 @@ instruction_address::function::do_bbo:instruction_address nia, int bitnum, unsig
instruction_address::function::do_bbz:instruction_address nia, int bitnum, unsigned32 source, int annul, unsigned32 offset
int jump_p;
unsigned32 target = cia.ip + 4 * offset;
if (!MASKED32 (source, bitnum, bitnum))
if (!MASKED32 (source, 32 - bitnum, 32 - bitnum))
{
if (annul)
nia.ip = -1;