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| author | Eric Botcazou <ebotcazou@adacore.com> | 2022-10-07 12:14:30 +0200 |
|---|---|---|
| committer | Eric Botcazou <ebotcazou@adacore.com> | 2022-10-07 12:16:36 +0200 |
| commit | 7b8a77eba5efbc6d9556f026774fa1447675602c (patch) | |
| tree | aebdd1d8d5bc7e843deaa3ac80f5543984623fbf /gcc/function.cc | |
| parent | ffaf244c442c575aadbe1c947e22f791a6f14c96 (diff) | |
| download | gcc-7b8a77eba5efbc6d9556f026774fa1447675602c.zip gcc-7b8a77eba5efbc6d9556f026774fa1447675602c.tar.gz gcc-7b8a77eba5efbc6d9556f026774fa1447675602c.tar.bz2 | |
Reduce DF computation at -O0
Even at -O0 there may be a fair amount of DF computation performed when
compiling large units and part of it appears to be useless.
gcc/
* function.cc (thread_prologue_and_epilogue_insns): Update only
entry and exit blocks when not optimizing. Remove dead statement.
Diffstat (limited to 'gcc/function.cc')
| -rw-r--r-- | gcc/function.cc | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/gcc/function.cc b/gcc/function.cc index 5498a71..6474a66 100644 --- a/gcc/function.cc +++ b/gcc/function.cc @@ -6249,10 +6249,15 @@ thread_prologue_and_epilogue_insns (void) } } - /* Threading the prologue and epilogue changes the artificial refs - in the entry and exit blocks. */ - epilogue_completed = 1; - df_update_entry_exit_and_calls (); + /* Threading the prologue and epilogue changes the artificial refs in the + entry and exit blocks, and may invalidate DF info for tail calls. */ + if (optimize) + df_update_entry_exit_and_calls (); + else + { + df_update_entry_block_defs (); + df_update_exit_block_uses (); + } } /* Reposition the prologue-end and epilogue-begin notes after |