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7029017: Additional architecture support for c2 compiler

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Enables cross building of a c2 VM. Support masking of shift counts when the processor architecture mandates it.

Reviewed-by: kvn, never
This commit is contained in:
Roland Westrelin 2011-03-25 09:35:39 +01:00
parent 9cc2cbba4b
commit 4171ca786e
13 changed files with 77 additions and 4 deletions
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30
hotspot/src/share/vm/opto/compile.cpp
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@ -2544,6 +2544,36 @@ static void final_graph_reshaping_impl( Node *n, Final_Reshape_Counts &frc ) {
frc.inc_inner_loop_count();
}
break;
case Op_LShiftI:
case Op_RShiftI:
case Op_URShiftI:
case Op_LShiftL:
case Op_RShiftL:
case Op_URShiftL:
if (Matcher::need_masked_shift_count) {
// The cpu's shift instructions don't restrict the count to the
// lower 5/6 bits. We need to do the masking ourselves.
Node* in2 = n->in(2);
juint mask = (n->bottom_type() == TypeInt::INT) ? (BitsPerInt - 1) : (BitsPerLong - 1);
const TypeInt* t = in2->find_int_type();
if (t != NULL && t->is_con()) {
juint shift = t->get_con();
if (shift > mask) { // Unsigned cmp
Compile* C = Compile::current();
n->set_req(2, ConNode::make(C, TypeInt::make(shift & mask)));
}
} else {
if (t == NULL || t->_lo < 0 || t->_hi > (int)mask) {
Compile* C = Compile::current();
Node* shift = new (C, 3) AndINode(in2, ConNode::make(C, TypeInt::make(mask)));
n->set_req(2, shift);
}
}
if (in2->outcnt() == 0) { // Remove dead node
in2->disconnect_inputs(NULL);
}
}
break;
default:
assert( !n->is_Call(), "" );
assert( !n->is_Mem(), "" );