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* [gcc r12-4595] Add dump prints when execute_fixup_cfg removes a write only var store.
@ 2021-10-21 8:20 Andrew Pinski
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From: Andrew Pinski @ 2021-10-21 8:20 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:005ebe1c07843e6312cd70523945fa1d729e7253
commit r12-4595-g005ebe1c07843e6312cd70523945fa1d729e7253
Author: Andrew Pinski <apinski@marvell.com>
Date: Sat Oct 16 02:30:55 2021 +0000
Add dump prints when execute_fixup_cfg removes a write only var store.
While debugging PR 102703, I found it was hard to figure out where
the store was being removed as there was no pass which was outputting
why the store was removed.
This adds to execute_fixup_cfg the output.
Also note most of removals happen when execute_fixup_cfg is called
from the inliner.
gcc/ChangeLog:
* tree-cfg.c (execute_fixup_cfg): Output when the statement
is removed when it is a write only var.
Diff:
---
gcc/tree-cfg.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/gcc/tree-cfg.c b/gcc/tree-cfg.c
index 4b4b0b52d9a..b78e4564e4d 100644
--- a/gcc/tree-cfg.c
+++ b/gcc/tree-cfg.c
@@ -9737,6 +9737,13 @@ execute_fixup_cfg (void)
&& (TREE_STATIC (lhs) || DECL_EXTERNAL (lhs))
&& varpool_node::get (lhs)->writeonly)
{
+ if (dump_file && (dump_flags & TDF_DETAILS))
+ {
+ fprintf (dump_file, "Removing statement, writes"
+ " to write only var:\n");
+ print_gimple_stmt (dump_file, stmt, 0,
+ TDF_VOPS|TDF_MEMSYMS);
+ }
unlink_stmt_vdef (stmt);
gsi_remove (&gsi, true);
release_defs (stmt);
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