[Bug inline-asm/57299] Inline assembly memory dependencies produce spurious loads, register pressure, compilation failures

[umbricola at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57299

--- Comment #2 from Chris Mihelich <umbricola at gmail dot com> ---
The asm statement uses only two registers.  Of the six inputs and outputs, only
"r" (p) and "r" (q) are registers; the four "=m" and "m" entries only declare
that memory is read or written in the assembly code.  See the part of
http://gcc.gnu.org/onlinedocs/gcc/Extended-Asm.html about memory operands
(search for "If your assembler instructions access memory").