builtins.c (std_expand_builtin_va_start): Take PARM_BOUNDARY into account.

* builtins.c (std_expand_builtin_va_start): Take PARM_BOUNDARY into account. From-SVN: r37381

builtins.c (std_expand_builtin_va_start): Take PARM_BOUNDARY into account.
* builtins.c (std_expand_builtin_va_start): Take PARM_BOUNDARY into account. From-SVN: r37381
3650b695 · Alexandre Oliva · Alexandre Oliva · 93a77848 · 3650b695 · 3650b695
Commit 3650b695 authored Nov 11, 2000 by Alexandre Oliva Committed by Alexandre Oliva Nov 11, 2000
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gcc/ChangeLog
+3 -0

gcc/builtins.c
+7 -3

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--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
 2000-11-11  Alexandre Oliva  <aoliva@redhat.com>

+	* builtins.c (std_expand_builtin_va_start): Take PARM_BOUNDARY
+	into account.
+
 	* config/sh/sh.h (MODES_TIEABLE_P): Don't tie SFmode to other FP
 	modes.


--- a/gcc/builtins.c
+++ b/gcc/builtins.c
@@ -2250,14 +2250,18 @@ stabilize_va_list (valist, needs_lvalue)
   the variable.  */
 void
 std_expand_builtin_va_start (stdarg_p, valist, nextarg)
-     int stdarg_p ATTRIBUTE_UNUSED;
+     int stdarg_p;
     tree valist;
     rtx nextarg;
 {
  tree t;

-  if (!stdarg_p)
-    nextarg = plus_constant (nextarg, -UNITS_PER_WORD);
+  if (! stdarg_p)
+    {
+      int align = PARM_BOUNDARY / BITS_PER_UNIT;
+      int offset = (((UNITS_PER_WORD + align - 1) / align) * align);
+      nextarg = plus_constant (nextarg, -offset);
+    }

  t = build (MODIFY_EXPR, TREE_TYPE (valist), valist,
 	     make_tree (ptr_type_node, nextarg));