modula-2: Remove uses of scalb*() and significand*() [PR107631]

The scalb*() functions are obsolete in Posix from 2004 and removed in
2008.

The significand*() functions are glibc-only and considered there to be
obsolescent (not supported for types such as _Float128).

We can remove them from Modula-2 since they are not required for ISO
support, but we need to provide an implementation of significand* for
the "fraction()" functions.

	PR modula2/107631

gcc/m2/ChangeLog:

	* gm2-gcc/m2builtins.cc: Remove scalb, scalbf, scalbl,
	significand, significandf, significandl.
	* gm2-libs/Builtins.def (significand): Likewise.
	* gm2-libs/Builtins.mod: Likewise.
	* target-independent/Builtins.texi: Likewise.
	* gm2-libs-iso/LowLong.mod: Implement fraction with scalbn*() and
	ilogb*().
	* gm2-libs-iso/LowReal.mod: Likewise.
	* gm2-libs-iso/LowShort.mod: Likewise.

7 files changed, 6 insertions, 71 deletions

diff --git a/gcc/m2/gm2-gcc/m2builtins.cc b/gcc/m2/gm2-gcc/m2builtins.cc
index bbfc605..35901a2 100644
--- a/gcc/m2/gm2-gcc/m2builtins.cc
+++ b/gcc/m2/gm2-gcc/m2builtins.cc
@@ -192,12 +192,6 @@ static struct builtin_function_entry list_of_builtins[] = {
     "signbitf", NULL, NULL },
   { "__builtin_signbitl", BT_FN_INT_LONG_DOUBLE, BUILT_IN_SIGNBITL,
     BUILT_IN_NORMAL, "signbitl", NULL, NULL },
-  { "__builtin_significand", BT_FN_DOUBLE_DOUBLE, BUILT_IN_SIGNIFICAND,
-    BUILT_IN_NORMAL, "significand", NULL, NULL },
-  { "__builtin_significandf", BT_FN_FLOAT_FLOAT, BUILT_IN_SIGNIFICANDF,
-    BUILT_IN_NORMAL, "significandf", NULL, NULL },
-  { "__builtin_significandl", BT_FN_LONG_DOUBLE_LONG_DOUBLE,
-    BUILT_IN_SIGNIFICANDL, BUILT_IN_NORMAL, "significandl", NULL, NULL },
   { "__builtin_modf", BT_FN_DOUBLE_DOUBLE_DOUBLEPTR, BUILT_IN_MODF,
     BUILT_IN_NORMAL, "modf", NULL, NULL },
   { "__builtin_modff", BT_FN_FLOAT_FLOAT_FLOATPTR, BUILT_IN_MODFF,
@@ -216,12 +210,6 @@ static struct builtin_function_entry list_of_builtins[] = {
     BUILT_IN_NEXTTOWARDF, BUILT_IN_NORMAL, "nexttowardf", NULL, NULL },
   { "__builtin_nexttowardl", BT_FN_LONG_DOUBLE_LONG_DOUBLE_LONG_DOUBLE,
     BUILT_IN_NEXTTOWARDL, BUILT_IN_NORMAL, "nexttowardl", NULL, NULL },
-  { "__builtin_scalb", BT_FN_DOUBLE_DOUBLE_DOUBLE, BUILT_IN_SCALB,
-    BUILT_IN_NORMAL, "scalb", NULL, NULL },
-  { "__builtin_scalbf", BT_FN_FLOAT_FLOAT_FLOAT, BUILT_IN_SCALBF,
-    BUILT_IN_NORMAL, "scalbf", NULL, NULL },
-  { "__builtin_scalbl", BT_FN_LONG_DOUBLE_LONG_DOUBLE_LONG_DOUBLE,
-    BUILT_IN_SCALBL, BUILT_IN_NORMAL, "scalbl", NULL, NULL },
   { "__builtin_scalbln", BT_FN_DOUBLE_DOUBLE_LONG, BUILT_IN_SCALBLN,
     BUILT_IN_NORMAL, "scalbln", NULL, NULL },
   { "__builtin_scalblnf", BT_FN_FLOAT_FLOAT_LONG, BUILT_IN_SCALBLNF,
diff --git a/gcc/m2/gm2-libs-iso/LowLong.mod b/gcc/m2/gm2-libs-iso/LowLong.mod
index 74f7ca9..9842679 100644
--- a/gcc/m2/gm2-libs-iso/LowLong.mod
+++ b/gcc/m2/gm2-libs-iso/LowLong.mod
@@ -27,7 +27,7 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 IMPLEMENTATION MODULE LowLong ;
 
 FROM SYSTEM IMPORT ADDRESS ;
-FROM Builtins IMPORT ilogbl, significandl, modfl, signbitl, scalbnl, huge_vall, nextafterl ;
+FROM Builtins IMPORT ilogbl, modfl, signbitl, scalbnl, huge_vall, nextafterl ;
 FROM dtoa IMPORT Mode, strtod, dtoa ;
 FROM libc IMPORT free ;
 FROM RealMath IMPORT power ;
@@ -64,10 +64,9 @@ END exponent ;
 
 PROCEDURE fraction (x: LONGREAL) : LONGREAL ;
 BEGIN
-   RETURN significandl(x)
+   RETURN scalbnl(x, -ilogbl (x))
 END fraction ;
 
-
 (*
    sign - returns the signum of x.  sign(x) = 1.0  for all x>0.0
           sign(x) = -1.0  for all x<0.0.
diff --git a/gcc/m2/gm2-libs-iso/LowReal.mod b/gcc/m2/gm2-libs-iso/LowReal.mod
index cc74f65..7db6ff0 100644
--- a/gcc/m2/gm2-libs-iso/LowReal.mod
+++ b/gcc/m2/gm2-libs-iso/LowReal.mod
@@ -27,7 +27,7 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 IMPLEMENTATION MODULE LowReal ;
 
 FROM SYSTEM IMPORT ADDRESS ;
-FROM Builtins IMPORT ilogb, significand, modf, signbit, scalbn, huge_val, nextafter ;
+FROM Builtins IMPORT ilogb, modf, signbit, scalbn, huge_val, nextafter ;
 FROM dtoa IMPORT Mode, strtod, dtoa ;
 FROM libc IMPORT free ;
 FROM RealMath IMPORT power ;
@@ -64,7 +64,7 @@ END exponent ;
 
 PROCEDURE fraction (x: REAL) : REAL ;
 BEGIN
-   RETURN significand(x)
+   RETURN scalbn (x, -ilogb (x))
 END fraction ;
 
 
diff --git a/gcc/m2/gm2-libs-iso/LowShort.mod b/gcc/m2/gm2-libs-iso/LowShort.mod
index 8921982..e820711 100644
--- a/gcc/m2/gm2-libs-iso/LowShort.mod
+++ b/gcc/m2/gm2-libs-iso/LowShort.mod
@@ -27,7 +27,7 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 IMPLEMENTATION MODULE LowShort ;
 
 FROM SYSTEM IMPORT ADDRESS ;
-FROM Builtins IMPORT ilogbf, significandf, modff, signbitf, scalbnf, huge_valf, nextafterf ;
+FROM Builtins IMPORT ilogbf, modff, signbitf, scalbnf, huge_valf, nextafterf ;
 FROM dtoa IMPORT Mode, strtod, dtoa ;
 FROM libc IMPORT free ;
 FROM RealMath IMPORT power ;
@@ -64,7 +64,7 @@ END exponent ;
 
 PROCEDURE fraction (x: SHORTREAL) : SHORTREAL ;
 BEGIN
-   RETURN significandf(x)
+   RETURN scalbnf (x, -ilogbf (x))
 END fraction ;
 
 
diff --git a/gcc/m2/gm2-libs/Builtins.def b/gcc/m2/gm2-libs/Builtins.def
index 1c32169..8d849be 100644
--- a/gcc/m2/gm2-libs/Builtins.def
+++ b/gcc/m2/gm2-libs/Builtins.def
@@ -78,10 +78,6 @@ PROCEDURE __BUILTIN__ huge_val () : REAL ;
 PROCEDURE __BUILTIN__ huge_valf () : SHORTREAL ;
 PROCEDURE __BUILTIN__ huge_vall () : LONGREAL ;
 
-PROCEDURE __BUILTIN__ significand (r: REAL) : REAL ;
-PROCEDURE __BUILTIN__ significandf (s: SHORTREAL) : SHORTREAL ;
-PROCEDURE __BUILTIN__ significandl (l: LONGREAL) : LONGREAL ;
-
 PROCEDURE __BUILTIN__ modf (x: REAL; VAR y: REAL) : REAL ;
 PROCEDURE __BUILTIN__ modff (x: SHORTREAL;
                              VAR y: SHORTREAL) : SHORTREAL ;
@@ -99,10 +95,6 @@ PROCEDURE __BUILTIN__ nexttoward (x, y: REAL) : LONGREAL ;
 PROCEDURE __BUILTIN__ nexttowardf (x, y: SHORTREAL) : LONGREAL ;
 PROCEDURE __BUILTIN__ nexttowardl (x, y: LONGREAL) : LONGREAL ;
 
-PROCEDURE __BUILTIN__ scalb (x, n: REAL) : REAL ;
-PROCEDURE __BUILTIN__ scalbf (x, n: SHORTREAL) : SHORTREAL ;
-PROCEDURE __BUILTIN__ scalbl (x, n: LONGREAL) : LONGREAL ;
-
 PROCEDURE __BUILTIN__ scalbln (x: REAL; n: LONGINT) : REAL ;
 PROCEDURE __BUILTIN__ scalblnf (x: SHORTREAL; n: LONGINT) : SHORTREAL ;
 PROCEDURE __BUILTIN__ scalblnl (x: LONGREAL; n: LONGINT) : LONGREAL ;
diff --git a/gcc/m2/gm2-libs/Builtins.mod b/gcc/m2/gm2-libs/Builtins.mod
index c679259..a5d9939 100644
--- a/gcc/m2/gm2-libs/Builtins.mod
+++ b/gcc/m2/gm2-libs/Builtins.mod
@@ -222,21 +222,6 @@ BEGIN
    RETURN cbuiltin.ilogbl (x)
 END ilogbl ;
 
-PROCEDURE __ATTRIBUTE__  __BUILTIN__ ((__builtin_significand)) significand (r: REAL) : REAL ;
-BEGIN
-   RETURN cbuiltin.significand (r)
-END significand ;
-
-PROCEDURE __ATTRIBUTE__  __BUILTIN__ ((__builtin_significandf)) significandf (s: SHORTREAL) : SHORTREAL ;
-BEGIN
-   RETURN cbuiltin.significandf (s)
-END significandf ;
-
-PROCEDURE __ATTRIBUTE__  __BUILTIN__ ((__builtin_significandl)) significandl (l: LONGREAL) : LONGREAL ;
-BEGIN
-   RETURN cbuiltin.significandl (l)
-END significandl ;
-
 PROCEDURE __ATTRIBUTE__  __BUILTIN__ ((__builtin_modf)) modf (x: REAL; VAR y: REAL) : REAL ;
 BEGIN
    RETURN cbuiltin.modf (x, y)
@@ -297,21 +282,6 @@ BEGIN
    RETURN cbuiltin.nexttowardl (x, y)
 END nexttowardl ;
 
-PROCEDURE __ATTRIBUTE__  __BUILTIN__ ((__builtin_scalb)) scalb (x, n: REAL) : REAL ;
-BEGIN
-   RETURN cbuiltin.scalb (x, n)
-END scalb ;
-
-PROCEDURE __ATTRIBUTE__  __BUILTIN__ ((__builtin_scalbf)) scalbf (x, n: SHORTREAL) : SHORTREAL ;
-BEGIN
-   RETURN cbuiltin.scalbf (x, n)
-END scalbf ;
-
-PROCEDURE __ATTRIBUTE__  __BUILTIN__ ((__builtin_scalbl)) scalbl (x, n: LONGREAL) : LONGREAL ;
-BEGIN
-   RETURN cbuiltin.scalbl (x, n)
-END scalbl ;
-
 PROCEDURE __ATTRIBUTE__  __BUILTIN__ ((__builtin_scalbln)) scalbln (x: REAL; n: LONGINT) : REAL ;
 BEGIN
    RETURN cbuiltin.scalbln (x, n)
diff --git a/gcc/m2/target-independent/Builtins.texi b/gcc/m2/target-independent/Builtins.texi
index 6ab1f2b..bf0afe1 100644
--- a/gcc/m2/target-independent/Builtins.texi
+++ b/gcc/m2/target-independent/Builtins.texi
@@ -90,13 +90,6 @@ PROCEDURE __BUILTIN__ huge_valf () : SHORTREAL ;
 @findex huge_vall
 PROCEDURE __BUILTIN__ huge_vall () : LONGREAL ;
 
-@findex significand
-PROCEDURE __BUILTIN__ significand (r: REAL) : REAL ;
-@findex significandf
-PROCEDURE __BUILTIN__ significandf (s: SHORTREAL) : SHORTREAL ;
-@findex significandl
-PROCEDURE __BUILTIN__ significandl (l: LONGREAL) : LONGREAL ;
-
 @findex modf
 PROCEDURE __BUILTIN__ modf (x: REAL; VAR y: REAL) : REAL ;
 @findex modff
@@ -126,13 +119,6 @@ PROCEDURE __BUILTIN__ nexttowardf (x, y: SHORTREAL) : LONGREAL ;
 @findex nexttowardl
 PROCEDURE __BUILTIN__ nexttowardl (x, y: LONGREAL) : LONGREAL ;
 
-@findex scalb
-PROCEDURE __BUILTIN__ scalb (x, n: REAL) : REAL ;
-@findex scalbf
-PROCEDURE __BUILTIN__ scalbf (x, n: SHORTREAL) : SHORTREAL ;
-@findex scalbl
-PROCEDURE __BUILTIN__ scalbl (x, n: LONGREAL) : LONGREAL ;
-
 @findex scalbln
 PROCEDURE __BUILTIN__ scalbln (x: REAL; n: LONGINT) : REAL ;
 @findex scalblnf