509 }
510
511
512 void LIR_Assembler::return_op(LIR_Opr result) {
513 assert(result->is_illegal() || !result->is_single_cpu() || result->as_register() == rax, "word returns are in rax,");
514 if (!result->is_illegal() && result->is_float_kind() && !result->is_xmm_register()) {
515 assert(result->fpu() == 0, "result must already be on TOS");
516 }
517
518 // Pop the stack before the safepoint code
519 __ remove_frame(initial_frame_size_in_bytes());
520
521 if (StackReservedPages > 0 && compilation()->has_reserved_stack_access()) {
522 __ reserved_stack_check();
523 }
524
525 bool result_is_oop = result->is_valid() ? result->is_oop() : false;
526
527 // Note: we do not need to round double result; float result has the right precision
528 // the poll sets the condition code, but no data registers
529 AddressLiteral polling_page(os::get_polling_page(), relocInfo::poll_return_type);
530
531 if (Assembler::is_polling_page_far()) {
532 __ lea(rscratch1, polling_page);
533 __ relocate(relocInfo::poll_return_type);
534 __ testl(rax, Address(rscratch1, 0));
535 } else {
536 __ testl(rax, polling_page);
537 }
538 __ ret(0);
539 }
540
541
542 int LIR_Assembler::safepoint_poll(LIR_Opr tmp, CodeEmitInfo* info) {
543 AddressLiteral polling_page(os::get_polling_page(), relocInfo::poll_type);
544 guarantee(info != NULL, "Shouldn't be NULL");
545 int offset = __ offset();
546 if (Assembler::is_polling_page_far()) {
547 __ lea(rscratch1, polling_page);
548 offset = __ offset();
549 add_debug_info_for_branch(info);
550 __ relocate(relocInfo::poll_type);
551 __ testl(rax, Address(rscratch1, 0));
552 } else {
553 add_debug_info_for_branch(info);
554 __ testl(rax, polling_page);
555 }
556 return offset;
557 }
558
559
560 void LIR_Assembler::move_regs(Register from_reg, Register to_reg) {
561 if (from_reg != to_reg) __ mov(to_reg, from_reg);
562 }
563
564 void LIR_Assembler::swap_reg(Register a, Register b) {
565 __ xchgptr(a, b);
566 }
567
568
569 void LIR_Assembler::const2reg(LIR_Opr src, LIR_Opr dest, LIR_PatchCode patch_code, CodeEmitInfo* info) {
570 assert(src->is_constant(), "should not call otherwise");
571 assert(dest->is_register(), "should not call otherwise");
572 LIR_Const* c = src->as_constant_ptr();
573
574 switch (c->type()) {
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509 }
510
511
512 void LIR_Assembler::return_op(LIR_Opr result) {
513 assert(result->is_illegal() || !result->is_single_cpu() || result->as_register() == rax, "word returns are in rax,");
514 if (!result->is_illegal() && result->is_float_kind() && !result->is_xmm_register()) {
515 assert(result->fpu() == 0, "result must already be on TOS");
516 }
517
518 // Pop the stack before the safepoint code
519 __ remove_frame(initial_frame_size_in_bytes());
520
521 if (StackReservedPages > 0 && compilation()->has_reserved_stack_access()) {
522 __ reserved_stack_check();
523 }
524
525 bool result_is_oop = result->is_valid() ? result->is_oop() : false;
526
527 // Note: we do not need to round double result; float result has the right precision
528 // the poll sets the condition code, but no data registers
529
530 if (SafepointMechanism::uses_thread_local_poll()) {
531 #ifdef _LP64
532 __ movptr(rscratch1, Address(r15_thread, Thread::polling_page_offset()));
533 __ relocate(relocInfo::poll_return_type);
534 __ testl(rax, Address(rscratch1, 0));
535 #else
536 ShouldNotReachHere();
537 #endif
538 } else {
539 AddressLiteral polling_page(os::get_polling_page(), relocInfo::poll_return_type);
540
541 if (Assembler::is_polling_page_far()) {
542 __ lea(rscratch1, polling_page);
543 __ relocate(relocInfo::poll_return_type);
544 __ testl(rax, Address(rscratch1, 0));
545 } else {
546 __ testl(rax, polling_page);
547 }
548 }
549 __ ret(0);
550 }
551
552
553 int LIR_Assembler::safepoint_poll(LIR_Opr tmp, CodeEmitInfo* info) {
554 guarantee(info != NULL, "Shouldn't be NULL");
555 int offset = __ offset();
556 if (SafepointMechanism::uses_thread_local_poll()) {
557 #ifdef _LP64
558 __ movptr(rscratch1, Address(r15_thread, Thread::polling_page_offset()));
559 add_debug_info_for_branch(info);
560 __ relocate(relocInfo::poll_type);
561 address pre_pc = __ pc();
562 __ testl(rax, Address(rscratch1, 0));
563 address post_pc = __ pc();
564 guarantee(pointer_delta(post_pc, pre_pc, 1) == 3, "must be exact length");
565 #else
566 ShouldNotReachHere();
567 #endif
568 } else {
569 AddressLiteral polling_page(os::get_polling_page(), relocInfo::poll_type);
570 if (Assembler::is_polling_page_far()) {
571 __ lea(rscratch1, polling_page);
572 offset = __ offset();
573 add_debug_info_for_branch(info);
574 __ relocate(relocInfo::poll_type);
575 __ testl(rax, Address(rscratch1, 0));
576 } else {
577 add_debug_info_for_branch(info);
578 __ testl(rax, polling_page);
579 }
580 }
581 return offset;
582 }
583
584
585 void LIR_Assembler::move_regs(Register from_reg, Register to_reg) {
586 if (from_reg != to_reg) __ mov(to_reg, from_reg);
587 }
588
589 void LIR_Assembler::swap_reg(Register a, Register b) {
590 __ xchgptr(a, b);
591 }
592
593
594 void LIR_Assembler::const2reg(LIR_Opr src, LIR_Opr dest, LIR_PatchCode patch_code, CodeEmitInfo* info) {
595 assert(src->is_constant(), "should not call otherwise");
596 assert(dest->is_register(), "should not call otherwise");
597 LIR_Const* c = src->as_constant_ptr();
598
599 switch (c->type()) {
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