Re: How to inline a huge m68k code?

[Ian Lance Taylor <iant at google dot com>]

ami_stuff <ami_stuff@o2.pl> writes:

> I want to ask for help with a huge m68k code which I try to inline.
>
> This is optimized 32x32->64 function for 68060 processor (68020/030/04 CPUs have
> this function in the hardware).

I don't understand what your actual question is.  What do you want gcc
to do differently?

gcc's longlong.h already has inlined assembly code for 32x32->64
multiplication.  For the 68060 it looks like this:

#define umul_ppmm(xh, xl, a, b) \
  __asm__ ("| Inlined umul_ppmm\n"					\
	   "	move%.l	%2,%/d0\n"					\
	   "	move%.l	%3,%/d1\n"					\
	   "	move%.l	%/d0,%/d2\n"					\
	   "	swap	%/d0\n"						\
	   "	move%.l	%/d1,%/d3\n"					\
	   "	swap	%/d1\n"						\
	   "	move%.w	%/d2,%/d4\n"					\
	   "	mulu	%/d3,%/d4\n"					\
	   "	mulu	%/d1,%/d2\n"					\
	   "	mulu	%/d0,%/d3\n"					\
	   "	mulu	%/d0,%/d1\n"					\
	   "	move%.l	%/d4,%/d0\n"					\
	   "	eor%.w	%/d0,%/d0\n"					\
	   "	swap	%/d0\n"						\
	   "	add%.l	%/d0,%/d2\n"					\
	   "	add%.l	%/d3,%/d2\n"					\
	   "	jcc	1f\n"						\
	   "	add%.l	%#65536,%/d1\n"					\
	   "1:	swap	%/d2\n"						\
	   "	moveq	%#0,%/d0\n"					\
	   "	move%.w	%/d2,%/d0\n"					\
	   "	move%.w	%/d4,%/d2\n"					\
	   "	move%.l	%/d2,%1\n"					\
	   "	add%.l	%/d1,%/d0\n"					\
	   "	move%.l	%/d0,%0"					\
	   : "=g" ((USItype) (xh)),					\
	     "=g" ((USItype) (xl))					\
	   : "g" ((USItype) (a)),					\
	     "g" ((USItype) (b))					\
	   : "d0", "d1", "d2", "d3", "d4")

Ian