https://gcc.gnu.org/g:7c3287f3613210d4f98c8095bc739bea6582bfbb
commit r15-2105-g7c3287f3613210d4f98c8095bc739bea6582bfbb
Author: Andrew Pinski <quic_apin...@quicinc.com>
Date: Tue Jul 16 09:53:20 2024 -0700
Add debug counter for ext_dce
Like r15-1610-gb6215065a5b143 (which adds one for late_combine),
adding one for ext_dce is useful to debug some issues with this pass.
Bootstrapped and tested on x86_64-linux-gnu with no regressions.
gcc/ChangeLog:
* dbgcnt.def (ext_dce): New debug counter.
* ext-dce.cc (ext_dce_try_optimize_insn): Reject the insn
if the debug counter says so.
(ext_dce): Rename to ...
(ext_dce_execute): This.
(pass_ext_dce::execute): Update for the name of ext_dce.
Signed-off-by: Andrew Pinski <quic_apin...@quicinc.com>
Diff:
---
gcc/dbgcnt.def | 1 +
gcc/ext-dce.cc | 16 +++++++++++++---
2 files changed, 14 insertions(+), 3 deletions(-)
diff --git a/gcc/dbgcnt.def b/gcc/dbgcnt.def
index e0b9b1b2a762..ac1f87098493 100644
--- a/gcc/dbgcnt.def
+++ b/gcc/dbgcnt.def
@@ -162,6 +162,7 @@ DEBUG_COUNTER (dom_unreachable_edges)
DEBUG_COUNTER (dse)
DEBUG_COUNTER (dse1)
DEBUG_COUNTER (dse2)
+DEBUG_COUNTER (ext_dce)
DEBUG_COUNTER (form_fma)
DEBUG_COUNTER (gcse2_delete)
DEBUG_COUNTER (gimple_unroll)
diff --git a/gcc/ext-dce.cc b/gcc/ext-dce.cc
index 6c961feee635..6d4b8858ec63 100644
--- a/gcc/ext-dce.cc
+++ b/gcc/ext-dce.cc
@@ -33,6 +33,7 @@ along with GCC; see the file COPYING3. If not see
#include "rtl-iter.h"
#include "df.h"
#include "print-rtl.h"
+#include "dbgcnt.h"
/* These should probably move into a C++ class. */
static vec<bitmap_head> livein;
@@ -312,6 +313,15 @@ ext_dce_try_optimize_insn (rtx_insn *insn, rtx set)
print_rtl_single (dump_file, SET_SRC (set));
}
+ /* We decided to turn do the optimization but allow it to be rejected for
+ bisection purposes. */
+ if (!dbg_cnt (::ext_dce))
+ {
+ if (dump_file)
+ fprintf (dump_file, "Rejected due to debug counter.\n");
+ return;
+ }
+
new_pattern = simplify_gen_subreg (GET_MODE (src), inner,
GET_MODE (inner), 0);
/* simplify_gen_subreg may fail in which case NEW_PATTERN will be NULL.
@@ -881,8 +891,8 @@ static bool ext_dce_rd_confluence_n (edge) { return true; }
are never read. Turn such extensions into SUBREGs instead which
can often be propagated away. */
-static void
-ext_dce (void)
+void
+ext_dce_execute (void)
{
df_analyze ();
ext_dce_init ();
@@ -929,7 +939,7 @@ public:
virtual bool gate (function *) { return flag_ext_dce && optimize > 0; }
virtual unsigned int execute (function *)
{
- ext_dce ();
+ ext_dce_execute ();
return 0;
}
