profile was calling vlong run-time support directly
which is counter-productive when those operations
are done by the compiler and might not even exist
in the library.  i've used A = A+B rather
than A += B to ensure the generated code is the same
(ie, calls to _addv and _subv) on those platforms
that still use them.  (those functions are handled specially for
profiling purposes in vlop.s on some platforms.)

it's probably time to put a bit more intelligent vlong
support into the portable part of cc, but this change
will allow alpha, amd64 and others to cope until i have
a chance to look at that (eg, for powerpc).

Reference: /n/sources/patch/applied/profilev
Date: Fri Mar 18 12:21:22 CET 2005

--- /sys/src/libc/port/profile.c	Fri Mar 18 12:16:42 2005
+++ /sys/src/libc/port/profile.c	Fri Mar 18 12:16:39 2005
@@ -4,8 +4,6 @@
 
 extern	long	_callpc(void**);
 extern	long	_savearg(void);
-extern	void	_addv(vlong*,vlong,vlong);
-extern	void	_subv(vlong*,vlong,vlong);
 
 ulong	khz;
 uvlong	cyclefreq;
@@ -61,19 +59,19 @@
 	p->count++;
 	switch(_tos->prof.what){
 	case Profkernel:
-		_subv(&p->time, p->time, _tos->pcycles);
+		p->time = p->time - _tos->pcycles;
 		goto proftime;
 	case Profuser:
 		/* Add kernel cycles on proc entry */
-		_addv(&p->time, p->time, _tos->kcycles);
+		p->time = p->time + _tos->kcycles;
 		/* fall through */
 	case Proftime:	
 	proftime:					/* Subtract cycle counter on proc entry */
 		cycles((uvlong*)&t);
-		_subv(&p->time, p->time, t);
+		p->time = p->time - t;
 		break;
 	case Profsample:
-		_subv(&p->time, p->time, (vlong)_tos->clock);
+		p->time = p->time - _tos->clock;
 		break;
 	}
 	return arg;		/* disgusting linkage */
@@ -92,18 +90,18 @@
 		return arg;	/* Not our process */
 	switch(_tos->prof.what){
 	case Profkernel:		/* Add proc cycles on proc entry */
-		_addv(&p->time, p->time, _tos->pcycles);
+		p->time = p->time + _tos->pcycles;
 		goto proftime;
 	case Profuser:			/* Subtract kernel cycles on proc entry */
-		_subv(&p->time, p->time, _tos->kcycles);
+		p->time = p->time - _tos->kcycles;
 		/* fall through */
 	case Proftime:	
 	proftime:				/* Add cycle counter on proc entry */
 		cycles((uvlong*)&t);
-		_addv(&p->time, p->time, t);
+		p->time = p->time + t;
 		break;
 	case Profsample:
-		_addv(&p->time, p->time, (vlong)_tos->clock);
+		p->time = p->time + _tos->clock;
 		break;
 	}
 	_tos->prof.pp = p->old;
@@ -137,11 +135,11 @@
 	switch(_tos->prof.what){
 	case Profkernel:
 		cycles((uvlong*)&_tos->prof.first->time);
-		_addv(&_tos->prof.first->time, _tos->prof.first->time, _tos->pcycles);
+		_tos->prof.first->time = _tos->prof.first->time + _tos->pcycles;
 		break;
 	case Profuser:
 		cycles((uvlong*)&_tos->prof.first->time);
-		_addv(&_tos->prof.first->time, _tos->prof.first->time, _tos->kcycles);
+		_tos->prof.first->time = _tos->prof.first->time + _tos->kcycles;
 		break;
 	case Proftime:
 		cycles((uvlong*)&_tos->prof.first->time);