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6743900: frequency based block layout

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Post-register allocation pass that drives block layout by edge frequencies

Reviewed-by: never, kvn
This commit is contained in:
Chuck Rasbold 2008-11-06 14:59:10 -08:00
parent 7bcfb5965d
commit 0e63b7609a
9 changed files with 1003 additions and 134 deletions
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11
hotspot/src/share/vm/opto/compile.cpp
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@ -822,6 +822,7 @@ void Compile::Init(int aliaslevel) {
Copy::zero_to_bytes(_trap_hist, sizeof(_trap_hist));
set_decompile_count(0);
set_do_freq_based_layout(BlockLayoutByFrequency || method_has_option("BlockLayoutByFrequency"));
// Compilation level related initialization
if (env()->comp_level() == CompLevel_fast_compile) {
set_num_loop_opts(Tier1LoopOptsCount);
@ -1701,8 +1702,14 @@ void Compile::Code_Gen() {
// are not adding any new instructions. If any basic block is empty, we
// can now safely remove it.
{
NOT_PRODUCT( TracePhase t2("removeEmpty", &_t_removeEmptyBlocks, TimeCompiler); )
cfg.RemoveEmpty();
NOT_PRODUCT( TracePhase t2("blockOrdering", &_t_blockOrdering, TimeCompiler); )
cfg.remove_empty();
if (do_freq_based_layout()) {
PhaseBlockLayout layout(cfg);
} else {
cfg.set_loop_alignment();
}
cfg.fixup_flow();
}
// Perform any platform dependent postallocation verifications.