On 05/05/2015 05:19 PM, Peter T. Breuer wrote:
Please .. where (in what file, dir) of the gcc (4.9.1) source should I
rummage in order to change the sequence of instructions eventually
emitted to do a function call?
Are you trying to change the caller or the callee?
For the callee, or1k_compute_frame_size calculates the frame size, which
depends on the frame layout. or1k_expand_prologue emits the RTL for the
prologue. or1k_expand_epilogue emits the RTL for the epilogue. There
are also a few other closely related helper functions. These are all in
gcc/config/or1k/or1k.c.
For the caller, I see that the or1k port already sets
ACCUMULATE_OUTGOING_ARGS, so there should be no stack pointer inc/dec
around a call. Only in the prologue/epilogue.
Jim
