re PR middle-end/18096 (internal compiler error: in final_scan_insn, at final.c:2429)

	PR middle-end/18096
	* config/rs6000/rs6000.c (rs6000_emit_allocate_stack): Check that
	the stack adjustment, "size", is valid for Pmode.  If the stack
	frame is too large, generate a trap insn and issue a warning.

	* gcc.dg/pr18096-1.c: New test case.

From-SVN: r89896

gcc/ChangeLog

+2004-10-30  Roger Sayle  <roger@eyesopen.com>
+
+	PR middle-end/18096
+	* config/rs6000/rs6000.c (rs6000_emit_allocate_stack): Check that
+	the stack adjustment, "size", is valid for Pmode.  If the stack
+	frame is too large, generate a trap insn and issue a warning.
+
 2004-10-30  Kazu Hirata  <kazu@cs.umass.edu>
 
 	* tree-ssa-dom.c: Fix comment typos.

gcc/config/rs6000/rs6000.c

@@ -13111,7 +13111,14 @@ rs6000_emit_allocate_stack (HOST_WIDE_INT size, int copy_r12)
   rtx insn;
   rtx stack_reg = gen_rtx_REG (Pmode, STACK_POINTER_REGNUM);
   rtx tmp_reg = gen_rtx_REG (Pmode, 0);
-  rtx todec = GEN_INT (-size);
+  rtx todec = gen_int_mode (-size, Pmode);
+
+  if (INTVAL (todec) != -size)
+    {
+      warning("stack frame too large");
+      emit_insn (gen_trap ());
+      return;
+    }
 
   if (current_function_limit_stack)
     {

gcc/testsuite/ChangeLog

 2004-10-30  Roger Sayle  <roger@eyesopen.com>
 
+	PR middle-end/18096
+	* gcc.dg/pr18096-1.c: New test case.
+
+2004-10-30  Roger Sayle  <roger@eyesopen.com>
+
 	* gcc.dg/pr17581-1.c: Add missing prototype for abort.
 
 2004-10-30  Joseph S. Myers  <joseph@codesourcery.com>

gcc/testsuite/gcc.dg/pr18096-1.c

+/* PR middle-end/18096  */
+/* { dg-do compile { target powerpc-*-* } } */
+/* { dg-options "-O2" } */
+
+void f(char*);
+
+void mkcatdefs(char *fname) 
+{
+  char line [2147483647];
+  f(line);
+} /* { dg-warning "stack frame too large" "stack frame too large" } */
+