git: 93fc67896550 - main - Fix incorrect powf(3) result with x near 1 and |y| much larger than 1

[Dimitry Andric]

The branch main has been updated by dim:

URL: https://cgit.FreeBSD.org/src/commit/?id=93fc67896550548f91b307dbe3053f11db5d4a8a

commit 93fc67896550548f91b307dbe3053f11db5d4a8a
Author:     Steve Kargl <sgk at troutmask.apl.washington.edu>
AuthorDate: 2021-02-08 19:45:30 +0000
Commit:     Dimitry Andric <dim at FreeBSD.org>
CommitDate: 2021-02-08 19:48:43 +0000

    Fix incorrect powf(3) result with x near 1 and |y| much larger than 1
    
    This adjusts the check to trigger overflow/underflow to a slightly lower
    value.
    
    Before: powf(9.999995e-01, -1.342177e+08) -> inf
    After:  powf(9.999995e-01, -1.342177e+08) -> 1.858724e+31
    
    MFC after:      1 week
---
 lib/msun/src/e_powf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/msun/src/e_powf.c b/lib/msun/src/e_powf.c
index 53f1d37d6bec..33eedad50b16 100644
--- a/lib/msun/src/e_powf.c
+++ b/lib/msun/src/e_powf.c
@@ -136,7 +136,7 @@ __ieee754_powf(float x, float y)
     /* |y| is huge */
 	if(iy>0x4d000000) { /* if |y| > 2**27 */
 	/* over/underflow if x is not close to one */
-	    if(ix<0x3f7ffff8) return (hy<0)? sn*huge*huge:sn*tiny*tiny;
+	    if(ix<0x3f7ffff7) return (hy<0)? sn*huge*huge:sn*tiny*tiny;
 	    if(ix>0x3f800007) return (hy>0)? sn*huge*huge:sn*tiny*tiny;
 	/* now |1-x| is tiny <= 2**-20, suffice to compute
 	   log(x) by x-x^2/2+x^3/3-x^4/4 */