alpha.c (alpha_expand_prologue): Fix off-by-one bug in the stack probing loop.

	* config/alpha/alpha.c (alpha_expand_prologue): Fix off-by-one bug
	in the stack probing loop.

From-SVN: r107069

gcc/ChangeLog

+2005-11-16  Eric Botcazou <ebotcazou@adacore.com>
+
+	* config/alpha/alpha.c (alpha_expand_prologue): Fix off-by-one bug
+	in the stack probing loop.
+
 2005-11-15  David Edelsohn  <edelsohn@gnu.org>
 
 	* configure.ac: Use .machine power5 not power5x.

gcc/config/alpha/alpha.c

@@ -7546,16 +7546,15 @@ alpha_expand_prologue (void)
     {
       if (frame_size > 4096)
 	{
-	  int probed = 4096;
+	  int probed;
 
-	  do
+	  for (probed = 4096; probed < frame_size; probed += 8192)
 	    emit_insn (gen_probe_stack (GEN_INT (TARGET_ABI_UNICOSMK
 						 ? -probed + 64
 						 : -probed)));
-	  while ((probed += 8192) < frame_size);
 
 	  /* We only have to do this probe if we aren't saving registers.  */
-	  if (sa_size == 0 && probed + 4096 < frame_size)
+	  if (sa_size == 0 && frame_size > probed - 4096)
 	    emit_insn (gen_probe_stack (GEN_INT (-frame_size)));
 	}