[Bug math/16414] IBM long double truncl assembly implementation showing wrong results

["azanella at linux dot vnet.ibm.com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=16414

Adhemerval Zanella Netto <azanella at linux dot vnet.ibm.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED

--- Comment #1 from Adhemerval Zanella Netto <azanella at linux dot vnet.ibm.com> ---
While seeking why some tgammal results shows wrong signal on PPC64, I found
out that the assembly implementation truncl
(sysdeps/powerpc/powerpc64/fpu/s_truncl.S)
for is in fact returning wrong results for some inputs. More specifically,
for number where the first double is a exact integer and the precision
is determined by second long double.

Checking on implementation comments and history, I am very confident the
assembly implementation was based on a version before commit
5c68d401698a58cf7da150d9cce769fa6679ba5f that fixes BZ#2423 (Errors in
long double (ldbl-128ibm) rounding functions in glibc-2.4), since
the implementation indeed does not handle some inputs correctly.

A possible solutions is just remove the implementation and make the build
select 
sysdeps/ieee754/ldbl-128ibm/s_truncl.c instead (which contains all the
appropriated fixes).

(Hit enter button before finishing editing, this comments is the bug
description).

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