Date: Fri, 29 May 2026 19:24:00 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 295706] [libm] Fix up for recent rsqrt[fl] functions. Message-ID: <bug-295706-227@https.bugs.freebsd.org/bugzilla/>
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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: bugs@FreeBSD.org Reporter: kargl@FreeBSD.org 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. -- You are receiving this mail because: You are the assignee for the bug.home | help
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