[Bug math/16369] New: Typo in csloww () in sysdeps/ieee754/dbl-64/s_sin.c

["ilmalakhov at yandex dot ru" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=16369

            Bug ID: 16369
           Summary: Typo in csloww () in sysdeps/ieee754/dbl-64/s_sin.c
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: math
          Assignee: unassigned at sourceware dot org
          Reporter: ilmalakhov at yandex dot ru

Hi.

 It's likely that there is a misprint in `sysdeps/ieee754/dbl-64/s_sin.c'
introduced by commit 4aafb73cb29df05f040b150fc06f756921825bbd while
consolidating common Taylor series polynomials into macros:

static double
SECTION
csloww (double x, double dx, double orig)
{
. . .
  /* Taylor series */
  t = TAYLOR_SLOW (x, dx, cor);
. . .
 if (res == res + cor)
    return res;
. . .

 The previous code should have been replaced with `res = TAYLOR_SLOW (. . .)' 
instead by analogy with `bsloww ()' and others. Currently `res' in `csloww ()'
remains uninitialized, which leads to an unpredictable result of this function.

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