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Power 6/32 Unix version 1.21

	4.3 libF77 port & performance enhancement changes
	-------------------------------------------------

1. Trap related routines - traper_.c trapov_.c trpfpe_.c - had been
   adapted to fit TAHOE machine. See comments in source files.

2. Variables had been declared as register variables whenever that seemed
   appropriate.

3. The following C files had been modified (in addition to 2. above):
	* bit.c - got rid of parameter check and internal calls.
	* cabs.c - cast everything to single precision; uses sign bit negation.
	* d_cnjg.c - uses sign bit negation.
	* d_mod.c - uses sign bit negation.
	* d_sign - uses sign bit negation; slightly changed algorithm.
	* string routines had been rewritten in asm in order to use string
	  instructions; asm files have "_s" suffix:
		- s_copy.c	-> s_copy_s.s
		- s_cmp.c	-> scmp_s.s
		- rindex_.c	-> rindex_s.s
		- i_indx.c	-> i_indx_s.s
		- h_indx.c	-> h_indx_s.s
		- hl_ge.c	-> hl_ge_s.s
		- hl_gt.c	-> hl_gt_s.s
		- hl_le.c	-> hl_le_s.s
		- hl_lt.c	-> hl_lt_s.s
		- l_ge.c	-> hl_ge_s.s
		- l_gt.c	-> hl_gt_s.s
		- l_le.c	-> hl_le_s.s
		- l_lt.c	-> hl_lt_s.s
		- s_cat.c	-> s_cat_s.s
	* pow_ci.c - rewritten for single precision computation; may loose some 
		     precision (last bit), but this should be expected when 
		     using a single precision function; if double precision is
		     needed, pow_zi has to be used.
	* pow_hh.c - got rid of a redundant statement.
	* pow_ii.c - got rid of a redundant statement.
	* r_mod.c - uses sign bit negation.
	* r_tan - rewritten for single precision computation, and use of sinf &
		  cosf machine instructions; precision is lost up to 4E-7;
		  if more precision is needed, d_tan has to be used.
	* range.c - rewritten in asm to avoid stack variables; became range_s.s.
	* system_.c - rewritten in asm to use string instructions;
		      became system_s.s
	* z_div - uses sign bit negation.
	* z_sqrt - uses sign bit negation.
	* zabs.c - uses sign bit negation; minor statement change.

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