https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=295706
Bug ID: 295706
Summary: [libm] Fix up for recent rsqrt[fl] functions.
Product: Base System
Version: CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: bin
Assignee: [email protected]
Reporter: [email protected]
Created attachment 271330
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=271330&action=edit
Patch to correct rounding and a few comments.
Paul Zimmermann (of Core-Math and MPFR fame) graciously tested
the recently committed rsqrt[fl]() functions. He identified 127
incorrectly rounded values for rsqrtf() in round-to-nearest mode.
This patch fixes the rounding in RN. Exhaustive testing now shows
that rsqrtf() is corrected rounded for RN. He also tested rsqrt()
and rsqrtl() in the interval [1,4). Both appear to be correctly
rounded. Finally, the patch includes small changes to comments.
A concise list of changes is
* lib/msun/src/s_rsqrt.c:
. Fix comments.
* lib/msun/src/s_rsqrtf.c
. Fix comments.
. Exhaustive testing by Paul Zimmermann found 127 incorrectly
rounded values in round-to-nearests. These gave have the
form 0x1.13e07pN with N an odd integer. With this patch, all
values are now correctly rounded in round-to-nearest.
* lib/msun/src/s_rsqrtl.c
. Fix comments.
. Move all variable declarations to top of function and sort.
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