A quicker check for quit
On some microbenchmarks this lets Emacs run 60% faster on my platform (AMD Phenom II X4 910e, Fedora 25 x86-64). * src/atimer.c: Include keyboard.h, for pending_signals. * src/editfns.c (Fcompare_buffer_substrings): * src/fns.c (Fnthcdr, Fmemq, Fmemql, Fassq, Frassq, Fplist_put) (Fnconc, Fplist_member): Set and clear immediate_quit before and after loop instead of executing QUIT each time through the loop. This is OK for loops that affect only locals. * src/eval.c (process_quit_flag): Now static. (maybe_quit): New function, containing QUIT’s old body. * src/fns.c (rarely_quit): New function. (Fmember, Fassoc, Frassoc, Fdelete, Fnreverse, Freverse) (Flax_plist_get, Flax_plist_put, internal_equal, Fnconc): Use it instead of QUIT, for speed in tight loops that might modify non-locals. * src/keyboard.h (pending_signals, process_pending_signals): These belong to keyboard.c, so move them here ... * src/lisp.h: ... from here. (QUIT): Redefine in terms of the new maybe_quit function, which contains this macro’s old definiens. This works well with branch prediction on processors with return stack buffers, e.g., x86 other than the original Pentium.
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