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Diffstat (limited to 'cpu/instructions/execution_control/call_conditional.txt')
| -rw-r--r-- | cpu/instructions/execution_control/call_conditional.txt | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/cpu/instructions/execution_control/call_conditional.txt b/cpu/instructions/execution_control/call_conditional.txt new file mode 100644 index 0000000..7663e54 --- /dev/null +++ b/cpu/instructions/execution_control/call_conditional.txt @@ -0,0 +1,22 @@ +Number of parameters: 2 + +Usage: call_conditional <type_and_index> <target> + type_and_index: + Lowest 3 bits: flags for each of the following checked, from lowest to highest: + Zero + Overflow + Carry + Next 3 bits: + Value for each of the above that it should match + Remaining bits: + Index into instruction queue for which result is to be compared + +Effect: + If all of the checked flags match the value to compare to: + IP pushed to stack + IP moved to <target> + + If no flags are to be checked, it will always set IP + +Exceptions: + Instruction reference nonexistent |