In the following two files:
gcc/libquadmath/math/expq.c
glibc/blob/master/sysdeps/ieee754/ldbl-128/e_expl.c
--------------------------------------------------------------------
static const __float128 C[] = {
/* Smallest integer x for which e^x overflows. */
#define himark C[0]
11356.523406294143949491931077970765Q,
/* Largest integer x for which e^x underflows. */
#define lomark C[1]
-11433.4627433362978788372438434526231Q,
/* 3x2^96 */
#define THREEp96 C[2]
237684487542793012780631851008.0Q,
/* 3x2^103 */
#define THREEp103 C[3]
30423614405477505635920876929024.0Q,
/* 3x2^111 */
#define THREEp111 C[4]
7788445287802241442795744493830144.0Q,
--------------------------------------------------------------------
Why is 3x2^96 defined as 59421121885698253195157962752 instead of
237684487542793012780631851008?
3x2^94=59421121885698253195157962752,
3x2^96=237684487542793012780631851008,
3x2^103=30423614405477505635920876929024,
3x2^111=7788445287802241442795744493830144.
