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| author | Cyril SIX <cyril.six@kalray.eu> | 2020-03-17 15:12:06 +0100 |
|---|---|---|
| committer | Cyril SIX <cyril.six@kalray.eu> | 2020-03-17 15:12:06 +0100 |
| commit | fb43d1078c0b0824132b30d7dd9bfe6b0ac47122 (patch) | |
| tree | b51287fed668d9fd06ab98f19dfe454d4c6a27b4 | |
| parent | aa2e3d776cb82ce01c4afdbacc52951e60ff2104 (diff) | |
| download | compcert-kvx-fb43d1078c0b0824132b30d7dd9bfe6b0ac47122.tar.gz compcert-kvx-fb43d1078c0b0824132b30d7dd9bfe6b0ac47122.zip | |
Desactivating branch predictions by default
| -rw-r--r-- | backend/Duplicateaux.ml | 18 | ||||
| -rw-r--r-- | driver/Clflags.ml | 2 | ||||
| -rw-r--r-- | driver/Driver.ml | 6 |
3 files changed, 17 insertions, 9 deletions
diff --git a/backend/Duplicateaux.ml b/backend/Duplicateaux.ml index 209527b9..a84f9754 100644 --- a/backend/Duplicateaux.ml +++ b/backend/Duplicateaux.ml @@ -502,11 +502,15 @@ let rec invert_iconds code = function let duplicate_aux f = let entrypoint = f.fn_entrypoint in let code = f.fn_code in - let traces = select_traces (to_ttl_code code entrypoint) entrypoint in - let icond_code = invert_iconds code traces in - let preds = get_predecessors_rtl icond_code in - if !Clflags.option_fduplicate >= 1 then - let (new_code, pTreeId) = ((* print_traces traces; *) superblockify_traces icond_code preds traces) in - ((new_code, f.fn_entrypoint), pTreeId) + if !Clflags.option_fduplicate < 0 then + ((code, entrypoint), make_identity_ptree code) else - ((icond_code, entrypoint), make_identity_ptree code) + let traces = select_traces (to_ttl_code code entrypoint) entrypoint in + let icond_code = invert_iconds code traces in + let preds = get_predecessors_rtl icond_code in + if !Clflags.option_fduplicate >= 1 then + let (new_code, pTreeId) = ((* print_traces traces; *) superblockify_traces icond_code preds traces) in + ((new_code, f.fn_entrypoint), pTreeId) + else + ((icond_code, entrypoint), make_identity_ptree code) + diff --git a/driver/Clflags.ml b/driver/Clflags.ml index 8054eb5b..6986fb96 100644 --- a/driver/Clflags.ml +++ b/driver/Clflags.ml @@ -28,7 +28,7 @@ let option_fconstprop = ref true let option_fcse = ref true let option_fcse2 = ref true let option_fredundancy = ref true -let option_fduplicate = ref 0 +let option_fduplicate = ref (-1) let option_finvertcond = ref true let option_ftracelinearize = ref false let option_fpostpass = ref true diff --git a/driver/Driver.ml b/driver/Driver.ml index 01451e07..388482a0 100644 --- a/driver/Driver.ml +++ b/driver/Driver.ml @@ -201,7 +201,11 @@ Processing options: -fpostpass Perform postpass scheduling (only for K1 architecture) [on] -fpostpass= <optim> Perform postpass scheduling with the specified optimization [list] (<optim>=list: list scheduling, <optim>=ilp: ILP, <optim>=greedy: just packing bundles) - -fduplicate Perform tail duplication to form superblocks on predicted traces + -fduplicate <nb_nodes> Perform tail duplication to form superblocks on predicted traces + nb_nodes control the heuristic deciding to duplicate or not + A value of -1 desactivates the entire pass (including branch prediction) + A value of 0 desactivates the duplication (but activates the branch prediction) + FIXME : this is desactivated by default for now -finvertcond Invert conditions based on predicted paths (to prefer fallthrough). Requires -fduplicate to be also activated [on] -ftracelinearize Linearizes based on the traces identified by duplicate phase |