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| author | Justus Fasse <justus.fasse@etu.univ-grenoble-alpes.fr> | 2021-08-04 13:43:51 +0200 |
|---|---|---|
| committer | Justus Fasse <justus.fasse@etu.univ-grenoble-alpes.fr> | 2021-08-04 13:43:51 +0200 |
| commit | 9fe2fbc02858632c3611f5a93d0d5525db9fded5 (patch) | |
| tree | e6c026b9924bf8219029e755a3d7237066e3762a | |
| parent | ecede419bff836a6ceefed2b76913fa773ffbdbc (diff) | |
| download | compcert-kvx-9fe2fbc02858632c3611f5a93d0d5525db9fded5.tar.gz compcert-kvx-9fe2fbc02858632c3611f5a93d0d5525db9fded5.zip | |
Use liveness information to prevent instructions getting incorrectly
scheduled upwards
| -rw-r--r-- | aarch64/PrepassSchedulingOracle.ml | 21 |
1 files changed, 15 insertions, 6 deletions
diff --git a/aarch64/PrepassSchedulingOracle.ml b/aarch64/PrepassSchedulingOracle.ml index ce34b1fd..6dc8711e 100644 --- a/aarch64/PrepassSchedulingOracle.ml +++ b/aarch64/PrepassSchedulingOracle.ml @@ -277,6 +277,10 @@ let get_fake_deps_liveness (opweights : opweights) (seqa : (instruction*Regset.t last_reg_reads := PTree.set reg (i :: get_last_reads reg) !last_reg_reads + and add_reg_read i reg = + last_reg_reads := PTree.set reg + (i :: get_last_reads reg) + !last_reg_reads and add_output_reg i latency reg = begin (* Write after write *) @@ -330,9 +334,9 @@ let get_fake_deps_liveness (opweights : opweights) (seqa : (instruction*Regset.t begin fun i (insn, other_uses) -> (* TODO? Perhaps the liveness info should be preserved for the final instruction? *) - (* List.iter (fun use -> - add_input_reg i use) - (Regset.elements other_uses); *) + List.iter (fun use -> + add_reg_read i use) + (Regset.elements other_uses); match insn with | Inop _ -> () @@ -474,6 +478,10 @@ let get_fake_deps_liveness_stores (opweights : opweights) (seqa : (instruction*R last_reg_reads := PTree.set reg (i :: get_last_reads reg) !last_reg_reads + and add_reg_read i reg = + last_reg_reads := PTree.set reg + (i :: get_last_reads reg) + !last_reg_reads and add_output_reg i latency reg = begin (* Write after write *) @@ -526,10 +534,11 @@ let get_fake_deps_liveness_stores (opweights : opweights) (seqa : (instruction*R Array.iteri begin fun i (insn, other_uses) -> - (* Ignore liveness + (* Ignore liveness, but treat as register read so that instructions are not + * incorrectly moved up, something we do not compensate. *) List.iter (fun use -> - add_input_reg i use) - (Regset.elements other_uses); *) + add_reg_read i use) + (Regset.elements other_uses); match insn with | Inop _ -> () |