(expand_inline_function): If called function calls alloca, save and

restore SP around its call.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@8601 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/integrate.c b/gcc/integrate.c
index a419350..12f0389 100644 (file)
--- a/gcc/integrate.c
+++ b/gcc/integrate.c
@@ -1167,6 +1167,7 @@ expand_inline_function (fndecl, parms, target, ignore, type, structure_value_add
   int nargs;
   rtx local_return_label = 0;
   rtx loc;
+  rtx stack_save = 0;
   rtx temp;
   struct inline_remap *map;
   rtx cc0_insn = 0;
@@ -1648,6 +1649,13 @@ expand_inline_function (fndecl, parms, target, ignore, type, structure_value_add
   global_const_equiv_map = map->const_equiv_map;
   global_const_equiv_map_size = map->const_equiv_map_size;
 
+  /* If the called fucntion does an alloca, save and restore the
+     frame pointer around the call.  This saves stack space, but
+     also is required if this inline is being done between two
+     pushes.  */
+  if (FUNCTION_FLAGS (header) & FUNCTION_FLAGS_CALLS_ALLOCA)
+    emit_stack_save (SAVE_BLOCK, &stack_save, NULL_RTX);
+
   /* Now copy the insns one by one.  Do this in two passes, first the insns and
      then their REG_NOTES, just like save_for_inline.  */
 
@@ -1868,6 +1876,10 @@ expand_inline_function (fndecl, parms, target, ignore, type, structure_value_add
   if (local_return_label)
     emit_label (local_return_label);
 
+  /* Restore the stack pointer if we saved it above.  */
+  if (FUNCTION_FLAGS (header) & FUNCTION_FLAGS_CALLS_ALLOCA)
+    emit_stack_restore (SAVE_BLOCK, stack_save, NULL_RTX);
+
   /* Make copies of the decls of the symbols in the inline function, so that
      the copies of the variables get declared in the current function.  Set
      up things so that lookup_static_chain knows that to interpret registers