On Thu, Oct 16, 2008 at 7:12 AM, Balaji V. Iyer <[EMAIL PROTECTED]> wrote: > Hello Everyone, > In GCC I found a MACRO called STRIP_NOPS and it is defined as the > following: > > #define STRIP_NOPS(EXP) \ > while ((TREE_CODE (EXP) == NOP_EXPR \ > || TREE_CODE (EXP) == CONVERT_EXPR \ > || TREE_CODE (EXP) == NON_LVALUE_EXPR) \ > && TREE_OPERAND (EXP, 0) != error_mark_node \ > && (TYPE_MODE (TREE_TYPE (EXP)) \ > == TYPE_MODE (TREE_TYPE (TREE_OPERAND (EXP, 0))))) \ > (EXP) = TREE_OPERAND (EXP, 0) >
You are confusing macros at different times in the compiler . STRIP_NOPS happens at the tree level whilst scheduling happens on RTL . This isn't the same as the nops you want to introduce for your pipeline hazards. > > I am currently having a VLIW architecture and I want to put NOPs between > the dependent instructions... So if I disable this #define, then will it > do the trick? Can someone please explain to me ohw this works? You need to define your pipeline automaton and then insert nops to avoid data hazards using machine_reorg or a trick as described by Ian here. http://gcc.gnu.org/ml/gcc/2006-03/msg00627.html cheers Ramana > > Any help is greatly appreciated! > > Please CC me in your response since I am not a subscribed to this list. > > Yours Sincerely, > > Balaji V. Iyer. > > > > -- > > Balaji V. Iyer > PhD Candidate, > Center for Efficient, Scalable and Reliable Computing, > Department of Electrical and Computer Engineering, > North Carolina State University. > > > -- Ramana Radhakrishnan
