[PATCH] Fix leading zero with g0 editing

[Jerry DeLisle <jvdelisle@charter.net>]

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This minor patch brings the leading zero to emitting floats with g0 editing by
moving the block of code up a little before the g0 is handled.  This has been
lurking in my trunk for several moths and I would like to get it out of the way.
Updated Test case also.

Regression tested on x86-64-linux.

OK for trunk?

Jerry

2015-11-22  Jerry DeLisle  <jvdelisle@gcc.gnu.org>

	* io/write_float.def (output_float): Move block determining
	room for leading zero to before checkng g0 formatting.


Index: fmt_g0_1.f08
===================================================================
--- fmt_g0_1.f08	(revision 230725)
+++ fmt_g0_1.f08	(working copy)
@@ -8,9 +8,9 @@
     write(buffer, string) ':',0,':'
     if (buffer.ne.":0:") call abort
     write(buffer, string) ':',1.0_8/3.0_8,':'
-    if (buffer.ne.":.33333333333333331:") call abort
+    if (buffer.ne.":0.33333333333333331:") call abort
     write(buffer, '(1x,a,g0,a)') ':',1.0_8/3.0_8,':'
-    if (buffer.ne." :.33333333333333331:") call abort
+    if (buffer.ne." :0.33333333333333331:") call abort
     write(buffer, string) ':',"hello",':'
     if (buffer.ne.":hello:") call abort
     write(buffer, "(g0,g0,g0,g0)") ':',.true.,.false.,':'

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Index: write_float.def
===================================================================
--- write_float.def	(revision 230709)
+++ write_float.def	(working copy)
@@ -514,12 +514,21 @@ output_float (st_parameter_dt *dtp, const fnode *f
 	  w = w == 1 ? 2 : w;
 	}
     }
-  
+
   /* Work out how much padding is needed.  */
   nblanks = w - (nbefore + nzero + nafter + edigits + 1);
   if (sign != S_NONE)
     nblanks--;
 
+  /* See if we have space for a zero before the decimal point.  */
+  if (nbefore == 0 && nblanks > 0)
+    {
+      leadzero = 1;
+      nblanks--;
+    }
+  else
+    leadzero = 0;
+
   if (dtp->u.p.g0_no_blanks)
     {
       w -= nblanks;
@@ -544,15 +553,6 @@ output_float (st_parameter_dt *dtp, const fnode *f
       return false;
     }
 
-  /* See if we have space for a zero before the decimal point.  */
-  if (nbefore == 0 && nblanks > 0)
-    {
-      leadzero = 1;
-      nblanks--;
-    }
-  else
-    leadzero = 0;
-
   /* For internal character(kind=4) units, we duplicate the code used for
      regular output slightly modified.  This needs to be maintained
      consistent with the regular code that follows this block.  */