[PATCH] libgcc/m68k: More fixes for soft float

Fix __extenddfxf2:

  * Remove bogus denorm handling block which would never execute --
    the converted exp value is always positive as EXCESSX > EXCESSD.

  * Compute the whole significand in dl instead of doing part of it in
    ldl.

    * Mask off exponent from dl.l.upper so the denorm shift test
      works.

    * Insert the hidden one bit into dl.l.upper as needed.

Fix __truncxfdf2 denorm handling. All that is required is to shift the
significand right by the correct amount; it already has all of the
necessary bits set including the explicit one. Compute the shift
amount, then perform the wide shift across both elements of the
significand.

Fix __fixxfsi:

  * The value  was off by a factor of two as the significand contains
    32 bits, not 31 so we need to shift by one more than the equivalent
    code in __fixdfsi.

  * Simplify the code having realized that the lower 32 bits of the
    significand can never appear in the results.

Return positive qNaN instead of negative. For floats, qNaN is 0x7fff_ffff. For
doubles, qNaN is 0x7fff_ffff_ffff_ffff.

Return correctly signed zero on float and double divide underflow. This means
that Ld$underflow now expects d7 to contain the sign bit, just like the other
return paths.

libgcc/
	* config/m68k/fpgnulib.c (extenddfxf2): Simplify code by removing code
	that should never execute.  Fix denorm shift test and insert hidden bit
	as needed.
	(__truncxfdf2): Properly compue and shift the significant right.
	* config/m68k/lb1sf68.S (__fixxfsi): Correct shift counts and simplify.
	(QUIET_NAN): Make it a positive quiet NaN and fix return values to inject
	sign properly.

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