math: Move __signbitf to separate file

There's no reason to combine __signbit and __signbitf in one file.

Signed-off-by: Keith Packard <[email protected]>

Author: keith-packard

newlib/libm/common/CMakeLists.txt

@@ -120,6 +120,7 @@ picolibc_sources(
   sf_remquo.c
   sf_round.c
   sf_scalbln.c
+  sf_signbit.c
   sf_trunc.c
   sf_exp2_data.c
   sf_log_data.c

newlib/libm/common/meson.build

@@ -97,6 +97,7 @@ fsrcs_common = [
   'sf_copysign.c',
   'sf_modf.c',
   'sf_scalbn.c',
+  'sf_signbit.c',
   'sf_cbrt.c',
   'sf_exp10.c',
   'sf_expm1.c',

newlib/libm/common/s_signbit.c

@@ -37,18 +37,6 @@ C99, POSIX.
 
 #include "fdlibm.h"
 
-int
-__signbitf (float x)
-{
-  __uint32_t w;
-
-  GET_FLOAT_WORD(w,x);
-
-  return (w & 0x80000000) != 0;
-}
-
-_MATH_ALIAS_i_f(__signbit)
-
 #ifdef _NEED_FLOAT64
 int
 __signbit64(__float64 x)

newlib/libm/common/sf_signbit.c

@@ -0,0 +1,50 @@
+/* Copyright (C) 2002 by  Red Hat, Incorporated. All rights reserved.
+ *
+ * Permission to use, copy, modify, and distribute this software
+ * is freely granted, provided that this notice is preserved.
+ */
+/*
+FUNCTION
+<<signbit>>---Does floating-point number have negative sign?
+
+INDEX
+	signbit
+
+SYNOPSIS
+	#include <math.h>
+	int signbit(real-floating <[x]>);
+
+DESCRIPTION
+The <<signbit>> macro determines whether the sign of its argument value is
+negative.  The macro reports the sign of all values, including infinities,
+zeros, and NaNs.  If zero is unsigned, it is treated as positive.  As shown in
+the synopsis, the argument is "real-floating," meaning that any of the real
+floating-point types (float, double, etc.) may be given to it.
+
+Note that because of the possibilities of signed 0 and NaNs, the expression
+"<[x]> < 0.0" does not give the same result as <<signbit>> in all cases.
+
+RETURNS
+The <<signbit>> macro returns a nonzero value if and only if the sign of its
+argument value is negative.
+
+PORTABILITY
+C99, POSIX.
+
+*/
+
+#define _ADD_D_TO_DOUBLE_FUNCS
+
+#include "fdlibm.h"
+
+int
+__signbitf (float x)
+{
+  __uint32_t w;
+
+  GET_FLOAT_WORD(w,x);
+
+  return (w & 0x80000000) != 0;
+}
+
+_MATH_ALIAS_i_f(__signbit)