RFC: Patch to libgcc2.h

[Jason Merrill]

Jakub's December 27 patch to libgcc2.c broke a lot of libgcc bits for
16-bit targets; the #defines to change, say, the definition of
__floatdisf to actually define __floatsisf produced conflicts with
better versions from libgcc1 and fp-bit.c.  In the case I've been
looking at, that definition was used rather than the one from
fp-bit.c, and so any code that needed to use __floatsisf ended up
going into an infinite recursion.

It's wrong to assume that things just scale down to smaller word
sizes.  Or perhaps it's right, but libgcc1 (in all its various
incarnations) and fp-bit.c and the compiler optabs need to be adjusted
as well.

This patch returns us to the state of affairs from before
Jakub's patch, namely that 16-bit targets again get definitions of
dimode functions that they'll never use, but gcc seems perfectly happy
to generate code for them, at least for the h8300 (which, admittedly,
is not a pure 16-bit part).

Any other thoughts as to how to solve this problem?

2000-06-14  Jason Merrill  <jason@redhat.com>

	* libgcc2.h: Lose special handling of 8 and 16-bit targets.

Index: libgcc2.h
===================================================================
RCS file: /cvs/cvsfiles/devo/gcc/libgcc2.h,v
retrieving revision 1.3
diff -c -p -r1.3 libgcc2.h
*** libgcc2.h	2000/05/23 17:25:39	1.3
--- libgcc2.h	2000/06/15 16:08:21
*************** typedef		 int QItype	__attribute__ ((mod
*** 84,95 ****
  typedef unsigned int UQItype	__attribute__ ((mode (QI)));
  typedef		 int HItype	__attribute__ ((mode (HI)));
  typedef unsigned int UHItype	__attribute__ ((mode (HI)));
- #if MIN_UNITS_PER_WORD > 1
- /* These typedefs are usually forbidden on dsp's with UNITS_PER_WORD 1 */
  typedef 	 int SItype	__attribute__ ((mode (SI)));
  typedef unsigned int USItype	__attribute__ ((mode (SI)));
- #if MIN_UNITS_PER_WORD > 2
- /* These typedefs are usually forbidden on archs with UNITS_PER_WORD 2 */
  typedef		 int DItype	__attribute__ ((mode (DI)));
  typedef unsigned int UDItype	__attribute__ ((mode (DI)));
  #if MIN_UNITS_PER_WORD > 4
--- 84,91 ----
*************** typedef unsigned int UDItype	__attribute
*** 97,104 ****
  typedef		 int TItype	__attribute__ ((mode (TI)));
  typedef unsigned int UTItype	__attribute__ ((mode (TI)));
  #endif
- #endif
- #endif
  
  #if BITS_PER_UNIT == 8
  
--- 93,98 ----
*************** typedef int word_type __attribute__ ((mo
*** 161,167 ****
  #define UDWtype	UTItype
  #define __NW(a,b)	__ ## a ## di ## b
  #define __NDW(a,b)	__ ## a ## ti ## b
! #elif MIN_UNITS_PER_WORD > 2
  #define W_TYPE_SIZE (4 * BITS_PER_UNIT)
  #define Wtype	SItype
  #define UWtype	USItype
--- 155,161 ----
  #define UDWtype	UTItype
  #define __NW(a,b)	__ ## a ## di ## b
  #define __NDW(a,b)	__ ## a ## ti ## b
! #else
  #define W_TYPE_SIZE (4 * BITS_PER_UNIT)
  #define Wtype	SItype
  #define UWtype	USItype
*************** typedef int word_type __attribute__ ((mo
*** 171,196 ****
  #define UDWtype	UDItype
  #define __NW(a,b)	__ ## a ## si ## b
  #define __NDW(a,b)	__ ## a ## di ## b
- #elif MIN_UNITS_PER_WORD > 1
- #define W_TYPE_SIZE (2 * BITS_PER_UNIT)
- #define Wtype	HItype
- #define UWtype	UHItype
- #define HWtype	HItype
- #define UHWtype	UHItype
- #define DWtype	SItype
- #define UDWtype	USItype
- #define __NW(a,b)	__ ## a ## hi ## b
- #define __NDW(a,b)	__ ## a ## si ## b
- #else
- #define W_TYPE_SIZE BITS_PER_UNIT
- #define Wtype	QItype
- #define UWtype  UQItype
- #define HWtype	QItype
- #define UHWtype	UQItype
- #define DWtype	HItype
- #define UDWtype	UHItype
- #define __NW(a,b)	__ ## a ## qi ## b
- #define __NDW(a,b)	__ ## a ## hi ## b
  #endif
  
  #define __muldi3	__NDW(mul,3)
--- 165,170 ----