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authorMagnus Lång <[email protected]>2016-09-01 17:21:25 +0200
committerMagnus Lång <[email protected]>2016-09-05 19:16:26 +0200
commit1039c0196a7e643c63ce71b2c6daa2b78b3aa832 (patch)
tree7540338826d46f9850278b3af8ad84e2f4c76119 /lib/hipe/ppc/hipe_ppc_ra_naive.erl
parentb4695b8088b8fc6f3844e33246849ed8bb8b18cf (diff)
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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/ppc/hipe_ppc_ra_naive.erl')
-rw-r--r--lib/hipe/ppc/hipe_ppc_ra_naive.erl6
1 files changed, 3 insertions, 3 deletions
diff --git a/lib/hipe/ppc/hipe_ppc_ra_naive.erl b/lib/hipe/ppc/hipe_ppc_ra_naive.erl
index ba269ae981..322fb1a171 100644
--- a/lib/hipe/ppc/hipe_ppc_ra_naive.erl
+++ b/lib/hipe/ppc/hipe_ppc_ra_naive.erl
@@ -20,11 +20,11 @@
%%
-module(hipe_ppc_ra_naive).
--export([ra/3]).
+-export([ra/4]).
-include("hipe_ppc.hrl").
-ra(CFG, _Coloring_fp, _Options) -> % -> {CFG, Coloring}
+ra(CFG, Liveness, _Coloring_fp, _Options) -> % -> {CFG, Liveness, Coloring}
{NewCFG,_DidSpill} =
hipe_ppc_ra_postconditions:check_and_rewrite2(CFG, [], 'naive'),
- {NewCFG, []}.
+ {NewCFG, Liveness, []}.