diff options
| -rw-r--r-- | sim/tic80/ChangeLog | 3 | ||||
| -rw-r--r-- | sim/tic80/insns | 6 |
2 files changed, 6 insertions, 3 deletions
diff --git a/sim/tic80/ChangeLog b/sim/tic80/ChangeLog index 33d6b1b..b1f9d09 100644 --- a/sim/tic80/ChangeLog +++ b/sim/tic80/ChangeLog @@ -3,7 +3,8 @@ 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. + (bbo,bbz): Complement bit number to reverse the one's complement + that the assembler is required to do. * misc.c (tic80_trace_*): Change format slightly to accomidate real large decimal values. diff --git a/sim/tic80/insns b/sim/tic80/insns index 6527833..c1a4467 100644 --- a/sim/tic80/insns +++ b/sim/tic80/insns @@ -107,7 +107,8 @@ 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, 32 - bitnum, 32 - bitnum)) + bitnum = (~ bitnum) & 0x1f; + if (MASKED32 (source, bitnum, bitnum)) { if (annul) nia.ip = -1; @@ -131,7 +132,8 @@ 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, 32 - bitnum, 32 - bitnum)) + bitnum = (~ bitnum) & 0x1f; + if (!MASKED32 (source, bitnum, bitnum)) { if (annul) nia.ip = -1; |