re PR rtl-optimization/8750 (Cygwin prolog generation erroneously emitting…

re PR rtl-optimization/8750 (Cygwin prolog generation erroneously emitting __alloca as regular function call)

        PR optimization/8750
        * config/i386/i386.c (ix86_expand_prologue): Don't allow
        scheduling pass to move insns across __alloca call.

From-SVN: r61068

gcc/ChangeLog

+2003-01-08  Danny Smith  <dannysmith@users.sourceforge.net>
+
+        PR optimization/8750
+        * config/i386/i386.c (ix86_expand_prologue): Don't allow
+        scheduling pass to move insns across __alloca call.
+
 2003-01-08  Dale Johannesen  <dalej@apple.com>
 
         * config/rs6000/rs6000.md:  Replace *store_multiple_string

gcc/config/i386/i386.c

@@ -4800,6 +4800,10 @@ ix86_expand_prologue ()
       CALL_INSN_FUNCTION_USAGE (insn)
 	= gen_rtx_EXPR_LIST (VOIDmode, gen_rtx_USE (VOIDmode, arg0),
 			     CALL_INSN_FUNCTION_USAGE (insn));
+
+      /* Don't allow scheduling pass to move insns across __alloca
+         call.  */
+      emit_insn (gen_blockage (const0_rtx));
     }
   if (use_mov)
     {