"Mohamed Shafi" <[EMAIL PROTECTED]> writes: > Say the target has two delay slots for call instructions. > So we can have something like this > (define_attr "slottable" "no,yes,has_slot" (const_string "yes")) > > (define_delay (eq_attr "slottable" "has_slot") > [(eq_attr "slottable" "yes") (nil) (nil) > (eq_attr "slottable" "yes") (nil) (nil)]) > > So in define_insn for call i can have > (set_attr "slottable" "has_slot") > > > Now imagine that i have 3 patterns : Pattern A with two instructions > in its template, Pattern B and Pattern C with only one instruction in > its template. > When it comes to filling the call instruction delay slot if slot 1 is > filled with Pattern A then there is no need to fill slot 2. But if its > filled with Pattern C or Pattern B, then slot 2 should be filled with > Pattern B or Pattern C, but not Pattern A. > Will i be able to do this in the back-end?
Ah, OK. It's easy enough to say that you can't put pattern A in slot 2. But there is no way to say that if pattern A is in slot 1, then slot 2 is not available. Ian
