msvcrt: Import exp2 implementation from musl.

configure

@@ -19619,20 +19619,6 @@ $as_echo "#define HAVE_ISNAN 1" >>confdefs.h
 
 fi
 
-for ac_func in \
-	exp2
-
-do :
-  as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
-ac_fn_c_check_func "$LINENO" "$ac_func" "$as_ac_var"
-if eval test \"x\$"$as_ac_var"\" = x"yes"; then :
-  cat >>confdefs.h <<_ACEOF
-#define `$as_echo "HAVE_$ac_func" | $as_tr_cpp` 1
-_ACEOF
-
-fi
-done
-
 LIBS="$ac_save_LIBS"
 
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for __builtin_popcount" >&5

configure.ac

@@ -2658,9 +2658,6 @@ then
     AC_DEFINE(HAVE_ISNAN, 1, [Define to 1 if you have the `isnan' function.])
 fi
 
-AC_CHECK_FUNCS(\
-	exp2
-)
 LIBS="$ac_save_LIBS"
 
 dnl Check for __builtin_popcount

dlls/msvcrt/unixlib.c

@@ -51,18 +51,6 @@ static double CDECL unix_exp( double x )
 }
 
 /*********************************************************************
- *      exp2
- */
-static double CDECL unix_exp2( double x )
-{
-#ifdef HAVE_EXP2
-    return exp2(x);
-#else
-    return pow(2, x);
-#endif
-}
-
-/*********************************************************************
  *      pow
  */
 static double CDECL unix_pow( double x, double y )
@@ -73,7 +61,6 @@ static double CDECL unix_pow( double x, double y )
 static const struct unix_funcs funcs =
 {
     unix_exp,
-    unix_exp2,
     unix_pow,
 };
 

dlls/msvcrt/unixlib.h

@@ -24,7 +24,6 @@
 struct unix_funcs
 {
     double          (CDECL *exp)(double x);
-    double          (CDECL *exp2)(double x);
     double          (CDECL *pow)(double x, double y);
 };
 

include/config.h.in

@@ -92,9 +92,6 @@
 /* Define to 1 if you have the `epoll_create' function. */
 #undef HAVE_EPOLL_CREATE
 
-/* Define to 1 if you have the `exp2' function. */
-#undef HAVE_EXP2
-
 /* Define to 1 if you have the `F3DAudioInitialize8' function. */
 #undef HAVE_F3DAUDIOINITIALIZE8