[Xtensa] make abs and addx/subx instructions optional

[Bob Wilson]

The Xtensa ABS and ADDX/SUBX instructions are currently part of the core 
Xtensa instruction set, but it's not necessary to use them.  With this patch, 
you can get GCC to avoid using these instructions.  This may be desireable if 
these instructions are expensive to use for some reason or if they become 
optional is some future Xtensa ISA.  Tested with the xtensa-elf target.  
Committed on mainline.

2003-05-20  Bob Wilson  <bob.wilson@acm.org>

	* config/xtensa/lib1funcs.asm: Avoid use of .Lfe* in .size directives.
	(do_abs, do_addx2, do_addx4, do_addx8): New assembler macros.
	(__mulsi3): Use do_addx* instead of ADDX* instructions.  Formatting.
	(nsau): Rename to do_nsau.  Provide alternate version for use when
	the NSAU instruction is available.
	(__udivsi3, __divsi3, __umodsi3, __modsi3): Use do_nsau macro.
	(__divsi3, __modsi3): Use do_abs macro instead of ABS instruction.
	* config/xtensa/xtensa-config.h: Update comments to match binutils.
	(XCHAL_HAVE_ABS, XCHAL_HAVE_ADDX): Define.
	* config/xtensa/xtensa.h (MASK_ABS, MASK_ADDX): Define.
	(TARGET_ABS, TARGET_ADDX): Define.
	(TARGET_DEFAULT): Conditionally add MASK_ABS and MASK_ADDX.
	(TARGET_SWITCHES): Add "abs", "no-abs", "addx", and "no-addx".
	* config/xtensa/xtensa.md (*addx2, *addx4, *addx8, *subx2, *subx4,
	*subx8): Set predicate condition to TARGET_ADDX.
	(abssi2): Set predicate condition to TARGET_ABS.
	* doc/invoke.texi (Option Summary): Document new "-mabs", "-mno-abs",
	"-maddx", and "-mno-addx" options.
	(Xtensa Options): Likewise.  Also tag some opcode names with @code.

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