reverse bit number for bbo/bbz instructions.

diff --git a/sim/tic80/ChangeLog b/sim/tic80/ChangeLog
index 4a458e428fb9d59066991fd54435584ebcbfea20..33d6b1b3ba2cd29e73a591283f9e02fdab49bcef 100644 (file)
--- a/sim/tic80/ChangeLog
+++ b/sim/tic80/ChangeLog
@@ -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.

diff --git a/sim/tic80/insns b/sim/tic80/insns
index 7c16213a775d473c1449d8cd57d89051a77a11c1..65278338f20ed2e6725383c24753049615d313c6 100644 (file)
--- a/sim/tic80/insns
+++ b/sim/tic80/insns
@@ -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;