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comparison src/share/vm/opto/compile.cpp @ 418:72c5366e5d86

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6743900: frequency based block layout Summary: post-register allocation pass that drives block layout by edge frequencies Reviewed-by: never, kvn
author rasbold
date Thu, 06 Nov 2008 14:59:10 -0800
parents f4fe12e429a4
children a1980da045cc
comparison
equal deleted inserted replaced
417:f4fe12e429a4 418:72c5366e5d86
820 _major_progress = true; // start out assuming good things will happen 820 _major_progress = true; // start out assuming good things will happen
821 set_has_unsafe_access(false); 821 set_has_unsafe_access(false);
822 Copy::zero_to_bytes(_trap_hist, sizeof(_trap_hist)); 822 Copy::zero_to_bytes(_trap_hist, sizeof(_trap_hist));
823 set_decompile_count(0); 823 set_decompile_count(0);
824 824
825 set_do_freq_based_layout(BlockLayoutByFrequency || method_has_option("BlockLayoutByFrequency"));
825 // Compilation level related initialization 826 // Compilation level related initialization
826 if (env()->comp_level() == CompLevel_fast_compile) { 827 if (env()->comp_level() == CompLevel_fast_compile) {
827 set_num_loop_opts(Tier1LoopOptsCount); 828 set_num_loop_opts(Tier1LoopOptsCount);
828 set_do_inlining(Tier1Inline != 0); 829 set_do_inlining(Tier1Inline != 0);
829 set_max_inline_size(Tier1MaxInlineSize); 830 set_max_inline_size(Tier1MaxInlineSize);
1699 // Prior to register allocation we kept empty basic blocks in case the 1700 // Prior to register allocation we kept empty basic blocks in case the
1700 // the allocator needed a place to spill. After register allocation we 1701 // the allocator needed a place to spill. After register allocation we
1701 // are not adding any new instructions. If any basic block is empty, we 1702 // are not adding any new instructions. If any basic block is empty, we
1702 // can now safely remove it. 1703 // can now safely remove it.
1703 { 1704 {
1704 NOT_PRODUCT( TracePhase t2("removeEmpty", &_t_removeEmptyBlocks, TimeCompiler); ) 1705 NOT_PRODUCT( TracePhase t2("blockOrdering", &_t_blockOrdering, TimeCompiler); )
1705 cfg.RemoveEmpty(); 1706 cfg.remove_empty();
1707 if (do_freq_based_layout()) {
1708 PhaseBlockLayout layout(cfg);
1709 } else {
1710 cfg.set_loop_alignment();
1711 }
1712 cfg.fixup_flow();
1706 } 1713 }
1707 1714
1708 // Perform any platform dependent postallocation verifications. 1715 // Perform any platform dependent postallocation verifications.
1709 debug_only( _regalloc->pd_postallocate_verify_hook(); ) 1716 debug_only( _regalloc->pd_postallocate_verify_hook(); )
1710 1717