/* ----------------------------------------------------------------------------
- * $Id: Constants.h,v 1.24 2003/03/25 16:19:55 sof Exp $
+ * $Id: Constants.h,v 1.25 2003/04/28 09:55:20 simonmar Exp $
*
* (c) The GHC Team, 1998-2002
*
This must be large enough to accomodate the largest stack frame
pushed in one of the heap check fragments in HeapStackCheck.hc
- (ie. currently the generic heap checks - 19 words).
+ (ie. currently the generic heap checks - 3 words for StgRetDyn,
+ 18 words for the saved registers, see StgMacros.h).
+
+ In the event of an unboxed tuple or let-no-escape stack/heap check
+ failure, there will be other words on the stack which are covered
+ by the RET_DYN frame. These will have been accounted for by stack
+ checks however, so we don't need to allow for them here.
-------------------------------------------------------------------------- */
-#define RESERVED_STACK_WORDS 19
+#define RESERVED_STACK_WORDS 21
/* -----------------------------------------------------------------------------
Storage manager constants