math: Fix UB on atanhf (BZ 32918)

The left shift overflows for 'int', use unsigned instead.  It syncs
with CORE-MATH commit 4d6192d2.

Checked on aarch64-linux-gnu, x86_64-linux-gnu, and i686-linux-gnu.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>

diff --git a/sysdeps/ieee754/flt-32/e_atanhf.c b/sysdeps/ieee754/flt-32/e_atanhf.c
index 513840832429eb85345cff7f3d735e35a4175230..eeb1aae6a13f6111f8c2096a570594e7824a79d0 100644 (file)
--- a/sysdeps/ieee754/flt-32/e_atanhf.c
+++ b/sysdeps/ieee754/flt-32/e_atanhf.c
@@ -3,7 +3,7 @@
 Copyright (c) 2023-2024 Alexei Sibidanov.
 
 The original version of this file was copied from the CORE-MATH
-project (file src/binary32/acosh/acoshf.c, revision bc385c2).
+project (file src/binary32/acosh/acoshf.c, revision 4d6192d2).
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
@@ -135,7 +135,7 @@ __ieee754_atanhf (float x)
     }
   double sgn = s[ux >> 31];
   unsigned int e = ax >> 24;
-  unsigned int md = ((ux << 8) | 1 << 31) >> (126 - e);
+  unsigned int md = ((ux << 8) | 1U << 31) >> (126 - e);
   unsigned int mn = -md;
   int nz = __builtin_clz (mn) + 1;
   mn <<= nz;