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[Bug ports/2749] powerpc32 does not build --without-fp
- From: "sjmunroe at us dot ibm dot com" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sources dot redhat dot com
- Date: 15 Sep 2006 14:08:40 -0000
- Subject: [Bug ports/2749] powerpc32 does not build --without-fp
- References: <20060609223502.2749.sjmunroe@us.ibm.com>
- Reply-to: sourceware-bugzilla at sourceware dot 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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