git: 9a0d922f57f2 - stable/13 - [libm] Correct comments in s_cbrt[l].c

The branch stable/13 has been updated by dim:

URL: https://cgit.FreeBSD.org/src/commit/?id=9a0d922f57f2aacee8aee7a190f4dcc1cd5d8bf9

commit 9a0d922f57f2aacee8aee7a190f4dcc1cd5d8bf9
Author:     Steve Kargl <kargl@FreeBSD.org>
AuthorDate: 2022-08-04 17:31:57 +0000
Commit:     Dimitry Andric <dim@FreeBSD.org>
CommitDate: 2022-08-07 09:02:36 +0000

    [libm] Correct comments in s_cbrt[l].c
    
    Damian McGuckin <damianm at esi dot com dot au> noted that the accuracy
    claims in the code for cbrt(3) and cbrtl(3) were incorrect. Fix the
    comments to more accurately describe the accuracies.
    
    PR:             265603
    MFC after:      3 days
    
    (cherry picked from commit 369ea0520a3061c07400d7cd32172efb6af39815)
---
 lib/msun/src/s_cbrt.c  | 2 +-
 lib/msun/src/s_cbrtl.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/msun/src/s_cbrt.c b/lib/msun/src/s_cbrt.c
index 0e609e110d9a..4353d340a1ac 100644
--- a/lib/msun/src/s_cbrt.c
+++ b/lib/msun/src/s_cbrt.c
@@ -108,7 +108,7 @@ cbrt(double x)
 	r=x/s;				/* error <= 0.5 ulps; |r| < |t| */
 	w=t+t;				/* t+t is exact */
 	r=(r-t)/(w+r);			/* r-t is exact; w+r ~= 3*t */
-	t=t+t*r;			/* error <= 0.5 + 0.5/3 + epsilon */
+	t=t+t*r;			/* error <= (0.5 + 0.5/3) * ulp */
 
 	return(t);
 }
diff --git a/lib/msun/src/s_cbrtl.c b/lib/msun/src/s_cbrtl.c
index 2236c0fa0348..b15c96ecde03 100644
--- a/lib/msun/src/s_cbrtl.c
+++ b/lib/msun/src/s_cbrtl.c
@@ -136,7 +136,7 @@ cbrtl(long double x)
 	r=x/s;				/* error <= 0.5 ulps; |r| < |t| */
 	w=t+t;				/* t+t is exact */
 	r=(r-t)/(w+r);			/* r-t is exact; w+r ~= 3*t */
-	t=t+t*r;			/* error <= 0.5 + 0.5/3 + epsilon */
+	t=t+t*r;			/* error <= (0.5 + 0.5/3) * ulp */
 
 	t *= v.e;
 	RETURNI(t);