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* [gcc r13-3156] Reduce DF computation at -O0
@ 2022-10-07 10:17 Eric Botcazou
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From: Eric Botcazou @ 2022-10-07 10:17 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:7b8a77eba5efbc6d9556f026774fa1447675602c
commit r13-3156-g7b8a77eba5efbc6d9556f026774fa1447675602c
Author: Eric Botcazou <ebotcazou@adacore.com>
Date: Fri Oct 7 12:14:30 2022 +0200
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.
Diff:
---
gcc/function.cc | 13 +++++++++----
1 file changed, 9 insertions(+), 4 deletions(-)
diff --git a/gcc/function.cc b/gcc/function.cc
index 5498a712c4a..6474a663b30 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
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