[Bug ports/2749] powerpc32 does not build --without-fp

["sjmunroe at us dot ibm dot com" <sourceware-bugzilla@sourceware.org>]

------- Additional Comments From sjmunroe at us dot ibm dot com  2006-09-15 14:08 -------
Update: David Edelsohn provided version of darwin-ldouble with a fmsub
implementation based on the soft-fp quad support macros. This was required to
produce the 106 intermediate result from the multiple to the final subtract.

Unfortunately the expansion of FP_SUB_Q produced incorrect results. Final
tracted this down to the __FP_FRAC_SUB_4 macro from op-4.h. The current version
does not propagate the borrows correctly for the 3rd anf 4th words. Corrected
this and we are see a big improvement in the results. Because IBM extented is
only gives 106 vs 113 for for IEEE we are seeing ULPS failures up to 8 bits, but
this expected for IBM extented and equivalent to hardware IBM extented results.
This is fixed in the no-fpu/libm-test-ulps.

Net test-float and test-double are clean and test-ldouble is down to 18 failures
(mostly incorrect sign of 0.0 or inf). Debugging continues but good progress.

-- 


http://sourceware.org/bugzilla/show_bug.cgi?id=2749

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