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math: Fix UB on logf (BZ 32920) 

The left shift overflows for 'int', use a literal instead.  It syncs
with OPTIMIZED-ROUTINES commit 0f87f607b976820ef41fe64d004fe67dc7af8236.

Checked on aarch64-linux-gnu, x86_64-linux-gnu, and i686-linux-gnu.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
This commit is contained in:
Adhemerval Zanella 2025-04-25 17:54:24 -03:00
parent 4a1b96bf52
commit de0c4adf94
1 changed files with 1 additions and 1 deletions
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sysdeps/ieee754/flt-32/e_logf.c
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@ -70,7 +70,7 @@ __logf (float x)
tmp = ix - OFF;
i = (tmp >> (23 - LOGF_TABLE_BITS)) % N;
k = (int32_t) tmp >> 23; /* arithmetic shift */
iz = ix - (tmp & 0x1ff << 23);
iz = ix - (tmp & 0xff800000);
invc = T[i].invc;
logc = T[i].logc;
z = (double_t) asfloat (iz);