Add BID decimal support

Co-Authored-By: H.J. Lu <hongjiu.lu@intel.com>
Co-Authored-By: Marius Cornea <marius.cornea@intel.com>

From-SVN: r123185

1 files changed, 41 insertions, 10 deletions

diff --git a/gcc/configure.ac b/gcc/configure.ac
index f3a6236..226b62a 100644
--- a/gcc/configure.ac
+++ b/gcc/configure.ac
@@ -667,27 +667,58 @@ AC_ARG_ENABLE(__cxa_atexit,
 
 # Enable C extension for decimal float if target supports it.
 AC_ARG_ENABLE(decimal-float,
-[  --enable-decimal-float  enable decimal float extension to C],
+[  --enable-decimal-float={no,yes,bid,dpd}
+			enable decimal float extension to C.  Selecting 'bid'
+			or 'dpd' choses which decimal floating point format
+			to use],
 [
-  if test x$enablevar = xyes ; then
-    case $target in
-    powerpc*-*-linux* | i?86*-*-linux*)
+  case $enable_decimal_float in
+    yes | no | bid | dpd) ;;
+    *) AC_MSG_ERROR(['$enable_decimal_float' is an invalid value for --enable-decimal-float.
+Valid choices are 'yes', 'bid', 'dpd', and 'no'.]) ;;
+  esac
+],
+[
+  case $target in
+    powerpc*-*-linux* | i?86*-*-linux* | x86_64*-*-linux*)
       enable_decimal_float=yes
       ;;
     *)
       AC_MSG_WARN(decimal float is not supported for this target, ignored)
       enable_decimal_float=no
       ;;
-    esac
-  fi
-], [enable_decimal_float=no])
-
-AC_SUBST(enable_decimal_float)
+  esac
+])
 
-dfp=`if test $enable_decimal_float = yes; then echo 1; else echo 0; fi`
+dfp=`if test $enable_decimal_float != no; then echo 1; else echo 0; fi`
 AC_DEFINE_UNQUOTED(ENABLE_DECIMAL_FLOAT, $dfp,
 [Define to 1 to enable decimal float extension to C.])
 
+# x86's use BID format instead of DPD
+case x$enable_decimal_float in
+  xyes)
+    case $target in
+      i?86*-*-linux* | x86_64*-*-linux*)
+	enable_decimal_float=bid
+	;;
+      *)
+	enable_decimal_float=dpd
+	;;
+    esac
+    ;;
+  xno)
+    # ENABLE_DECIMAL_FLOAT is set to 0. But we have to have proper
+    # dependency on libdecnumber.
+    enable_decimal_float=dpd
+    ;;
+esac
+AC_SUBST(enable_decimal_float)
+
+bid=`if test $enable_decimal_float = bid; then echo 1; else echo 0; fi`
+AC_DEFINE_UNQUOTED(ENABLE_DECIMAL_BID_FORMAT, $bid,
+[Define to 1 to specify that we are using the BID decimal floating
+point format instead of DPD])
+
 # Enable threads
 # Pass with no value to take the default
 # Pass with a value to specify a thread package