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| author | Magnus Lång <[email protected]> | 2016-09-01 17:21:25 +0200 |
|---|---|---|
| committer | Magnus Lång <[email protected]> | 2016-09-05 19:16:26 +0200 |
| commit | 1039c0196a7e643c63ce71b2c6daa2b78b3aa832 (patch) | |
| tree | 7540338826d46f9850278b3af8ad84e2f4c76119 /lib/hipe/regalloc/hipe_ls_regalloc.erl | |
| parent | b4695b8088b8fc6f3844e33246849ed8bb8b18cf (diff) | |
| download | otp-1039c0196a7e643c63ce71b2c6daa2b78b3aa832.tar.gz otp-1039c0196a7e643c63ce71b2c6daa2b78b3aa832.tar.bz2 otp-1039c0196a7e643c63ce71b2c6daa2b78b3aa832.zip | |
hipe: Reuse liveness between regalloc iterations
This is sound because the liveness data structure only stores liveness
info at basic block boundaries, and the rewrites that happen in
TargetSpecific:check_and_rewrite/2 preserves all existing definitions
and uses, and all new liveness intervals, belonging to newly introduced
temporaries, are always local to a basic block, and thus do not show up
in the liveout or livein sets for the basic block.
Diffstat (limited to 'lib/hipe/regalloc/hipe_ls_regalloc.erl')
| -rw-r--r-- | lib/hipe/regalloc/hipe_ls_regalloc.erl | 20 |
1 files changed, 3 insertions, 17 deletions
diff --git a/lib/hipe/regalloc/hipe_ls_regalloc.erl b/lib/hipe/regalloc/hipe_ls_regalloc.erl index c318927077..8d9cd8f507 100644 --- a/lib/hipe/regalloc/hipe_ls_regalloc.erl +++ b/lib/hipe/regalloc/hipe_ls_regalloc.erl @@ -56,7 +56,7 @@ %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% -module(hipe_ls_regalloc). --export([regalloc/7, regalloc/8]). +-export([regalloc/8]). %%-define(DEBUG,1). -define(HIPE_INSTRUMENT_COMPILER, true). @@ -95,19 +95,8 @@ %% </ol> %% @end %%- - - - - - - - - - - - - - - - - - - - - - - - -regalloc(CFG, PhysRegs, Entrypoints, SpillIndex, DontSpill, Options, Target) -> - regalloc(CFG, undefined, PhysRegs, Entrypoints, SpillIndex, DontSpill, Options, Target). - -regalloc(CFG, Liveness0, PhysRegs, Entrypoints, SpillIndex, DontSpill, Options, Target) -> +regalloc(CFG, Liveness, PhysRegs, Entrypoints, SpillIndex, DontSpill, Options, Target) -> ?debug_msg("LinearScan: ~w\n", [erlang:statistics(runtime)]), - %% Step 1: Calculate liveness (Call external implementation.) - Liveness = case Liveness0 of - undefined -> - L=liveness(CFG, Target), - ?debug_msg("liveness (done)~w\n", [erlang:statistics(runtime)]), - L; - _ -> Liveness0 - end, USIntervals = calculate_intervals(CFG, Liveness, Entrypoints, Options, Target), ?debug_msg("intervals (done) ~w\n", [erlang:statistics(runtime)]), @@ -119,7 +108,7 @@ regalloc(CFG, Liveness0, PhysRegs, Entrypoints, SpillIndex, DontSpill, Options, {Coloring, NewSpillIndex} = allocate(Intervals, PhysRegs, SpillIndex, DontSpill, Target), ?debug_msg("allocation (done) ~w\n", [erlang:statistics(runtime)]), - {Coloring, NewSpillIndex, Liveness}. + {Coloring, NewSpillIndex}. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %% %% @@ -760,9 +749,6 @@ create_freeregs([]) -> %% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% -liveness(CFG, Target) -> - Target:analyze(CFG). - bb(CFG, L, Target) -> Target:bb(CFG,L). |