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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_ls.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_ls.erl')
-rw-r--r--lib/hipe/ppc/hipe_ppc_ra_ls.erl21
1 files changed, 11 insertions, 10 deletions
diff --git a/lib/hipe/ppc/hipe_ppc_ra_ls.erl b/lib/hipe/ppc/hipe_ppc_ra_ls.erl
index 52562fc321..956b55d9f1 100644
--- a/lib/hipe/ppc/hipe_ppc_ra_ls.erl
+++ b/lib/hipe/ppc/hipe_ppc_ra_ls.erl
@@ -21,16 +21,16 @@
%%% Linear Scan register allocator for PowerPC
-module(hipe_ppc_ra_ls).
--export([ra/3]).
+-export([ra/4]).
-ra(CFG, SpillIndex, Options) ->
+ra(CFG, Liveness, SpillIndex, Options) ->
SpillLimit = hipe_ppc_specific:number_of_temporaries(CFG),
- alloc(CFG, SpillIndex, SpillLimit, Options).
+ alloc(CFG, Liveness, SpillIndex, SpillLimit, Options).
-alloc(CFG, SpillIndex, SpillLimit, Options) ->
- {Coloring, _NewSpillIndex, Liveness} =
+alloc(CFG, Liveness, SpillIndex, SpillLimit, Options) ->
+ {Coloring, _NewSpillIndex} =
regalloc(
- CFG,
+ CFG, Liveness,
hipe_ppc_registers:allocatable_gpr()--
[hipe_ppc_registers:temp3(),
hipe_ppc_registers:temp2(),
@@ -47,8 +47,9 @@ alloc(CFG, SpillIndex, SpillLimit, Options) ->
hipe_ppc_specific, TempMap),
Coloring2 =
hipe_spillmin:mapmerge(hipe_temp_map:to_substlist(TempMap), TempMap2),
- {NewCFG, Coloring2}.
+ {NewCFG, Liveness, Coloring2}.
-regalloc(CFG, PhysRegs, Entrypoints, SpillIndex, DontSpill, Options, Target) ->
- hipe_ls_regalloc:regalloc(
- CFG, PhysRegs, Entrypoints, SpillIndex, DontSpill, Options, Target).
+regalloc(CFG, Liveness, PhysRegs, Entrypoints, SpillIndex, DontSpill, Options,
+ Target) ->
+ hipe_ls_regalloc:regalloc(CFG, Liveness, PhysRegs, Entrypoints, SpillIndex,
+ DontSpill, Options, Target).