---------------------------------------------------------------------------
LLTRACE introduced well before 1.0
-Compile in support of Low Level TRACE-ing of the main interpreter loop.
+Compile in support for Low Level TRACE-ing of the main interpreter loop.
-When this preprocessor symbol is defined, before eval_frame
-(eval_code2 before 2.2) executes a frame's code it checks the frame's
-global namespace for a variable "__lltrace__". If such a variable is
-found, mounds of information about what the interpreter is doing are
-sprayed to stdout, such as every opcode and opcode argument and values
-pushed onto and popped off the value stack.
+When this preprocessor symbol is defined, before PyEval_EvalFrame
+(eval_frame in 2.3 and 2.2, eval_code2 before that) executes a frame's code
+it checks the frame's global namespace for a variable "__lltrace__". If
+such a variable is found, mounds of information about what the interpreter
+is doing are sprayed to stdout, such as every opcode and opcode argument
+and values pushed onto and popped off the value stack.
Not useful very often, but very useful when needed.
On the PowerPC the rate at which the time base register is incremented
is not defined by the architecture specification, so you'll need to
-find the manual for your specific processor. For the 750CX, 750CXe,
-750FX (all sold as the G3) we find:
+find the manual for your specific processor. For the 750CX, 750CXe
+and 750FX (all sold as the G3) we find:
The time base counter is clocked at a frequency that is
one-fourth that of the bus clock.