[newlib-cygwin] Fix expf overflow limit

[Corinna Vinschen <corinna@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=8f2bd6f046cf2c7a6d7332bf056ebdb294077747

commit 8f2bd6f046cf2c7a6d7332bf056ebdb294077747
Author: Andoni Arregi <andoni.arregui@gtd-gmbh.de>
Date:   Wed Feb 9 14:52:07 2022 +0100

    Fix expf overflow limit
    
    Correct the overflow limit in the variable o_threshold to be consistent
    with the FLT_UWORD_LOG_MAX variable used by the internal implementation
    of the expf algorithm itself.
    The u_threshold variable has also been modified to be written in the
    same format.
    
    Note that this fix improves the situation but does not completely
    correct the inconsistencies regarding the overflow and underflow limits
    between the expf wrapper (wf_exp.c) and the expf algorithm itself
    (ef_exp.c).
    
    Currently these limits are different for the
    _FLT_LARGEST_EXPONENT_IS_NORMAL and _FLT_NO_DENORMALS cases as well as
    for the case where __OBSOLETE_MATH is not defined (only for the
    underflow limit in this case).

Diff:
---
 newlib/libm/math/wf_exp.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/newlib/libm/math/wf_exp.c b/newlib/libm/math/wf_exp.c
index 38cacd95a..075b5bb0a 100644
--- a/newlib/libm/math/wf_exp.c
+++ b/newlib/libm/math/wf_exp.c
@@ -26,8 +26,8 @@ static const float
 #else
 static float
 #endif
-o_threshold=  8.8721679688e+01,  /* 0x42b17180 */
-u_threshold= -1.0397208405e+02;  /* 0xc2cff1b5 */
+o_threshold=  0x1.62e42ep+06,  /* 0x42b17217 */
+u_threshold= -0x1.9fe36ap+06;  /* 0xc2cff1b5 */
 
 #ifdef __STDC__
 	float expf(float x)		/* wrapper expf */