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comparison src/share/vm/opto/compile.cpp @ 2401:7e88bdae86ec

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7029017: Additional architecture support for c2 compiler Summary: Enables cross building of a c2 VM. Support masking of shift counts when the processor architecture mandates it. Reviewed-by: kvn, never
author roland
date Fri, 25 Mar 2011 09:35:39 +0100
parents c7f3d0b4570f
children 08eb13460b3a 92add02409c9
comparison
equal deleted inserted replaced
2399:b2949bf39900 2401:7e88bdae86ec
2542 case Op_CountedLoop: 2542 case Op_CountedLoop:
2543 if (n->as_Loop()->is_inner_loop()) { 2543 if (n->as_Loop()->is_inner_loop()) {
2544 frc.inc_inner_loop_count(); 2544 frc.inc_inner_loop_count();
2545 } 2545 }
2546 break; 2546 break;
2547 case Op_LShiftI:
2548 case Op_RShiftI:
2549 case Op_URShiftI:
2550 case Op_LShiftL:
2551 case Op_RShiftL:
2552 case Op_URShiftL:
2553 if (Matcher::need_masked_shift_count) {
2554 // The cpu's shift instructions don't restrict the count to the
2555 // lower 5/6 bits. We need to do the masking ourselves.
2556 Node* in2 = n->in(2);
2557 juint mask = (n->bottom_type() == TypeInt::INT) ? (BitsPerInt - 1) : (BitsPerLong - 1);
2558 const TypeInt* t = in2->find_int_type();
2559 if (t != NULL && t->is_con()) {
2560 juint shift = t->get_con();
2561 if (shift > mask) { // Unsigned cmp
2562 Compile* C = Compile::current();
2563 n->set_req(2, ConNode::make(C, TypeInt::make(shift & mask)));
2564 }
2565 } else {
2566 if (t == NULL || t->_lo < 0 || t->_hi > (int)mask) {
2567 Compile* C = Compile::current();
2568 Node* shift = new (C, 3) AndINode(in2, ConNode::make(C, TypeInt::make(mask)));
2569 n->set_req(2, shift);
2570 }
2571 }
2572 if (in2->outcnt() == 0) { // Remove dead node
2573 in2->disconnect_inputs(NULL);
2574 }
2575 }
2576 break;
2547 default: 2577 default:
2548 assert( !n->is_Call(), "" ); 2578 assert( !n->is_Call(), "" );
2549 assert( !n->is_Mem(), "" ); 2579 assert( !n->is_Mem(), "" );
2550 break; 2580 break;
2551 } 2581 }