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* [gcc(refs/users/guojiufu/heads/personal-branch)] tree-optimization/95576 - fix compare-debug issue with SLP vectorization
@ 2020-06-13 2:53 Jiu Fu Guo
0 siblings, 0 replies; only message in thread
From: Jiu Fu Guo @ 2020-06-13 2:53 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:36e95a9e539a08275a0a6ef542a7fae5baa5710f
commit 36e95a9e539a08275a0a6ef542a7fae5baa5710f
Author: Richard Biener <rguenther@suse.de>
Date: Wed Jun 10 15:16:23 2020 +0200
tree-optimization/95576 - fix compare-debug issue with SLP vectorization
The following avoids leading debug stmts in BB vectorizer regions.
2020-06-10 Richard Biener <rguenther@suse.de>
PR tree-optimization/95576
* tree-vect-slp.c (vect_slp_bb): Skip leading debug stmts.
* g++.dg/vect/pr95576.cc: New testcase.
Diff:
---
gcc/testsuite/g++.dg/vect/pr95576.cc | 23 +++++++++++++++++++++++
gcc/tree-vect-slp.c | 9 ++++++++-
2 files changed, 31 insertions(+), 1 deletion(-)
diff --git a/gcc/testsuite/g++.dg/vect/pr95576.cc b/gcc/testsuite/g++.dg/vect/pr95576.cc
new file mode 100644
index 00000000000..64e0e2dae7f
--- /dev/null
+++ b/gcc/testsuite/g++.dg/vect/pr95576.cc
@@ -0,0 +1,23 @@
+// { dg-do compile }
+// { dg-additional-options "-O3 -fno-tree-forwprop -fcompare-debug" }
+
+struct S {
+ virtual ~S();
+ struct S *s;
+ virtual void m();
+ int f;
+ void *d;
+};
+
+struct T : S {
+ void m();
+};
+
+S::~S() {
+ if (s) {
+ s->f = 0;
+ s->d = __null;
+ }
+}
+
+void T::m() {}
diff --git a/gcc/tree-vect-slp.c b/gcc/tree-vect-slp.c
index 0217a524f05..866ce8d3717 100644
--- a/gcc/tree-vect-slp.c
+++ b/gcc/tree-vect-slp.c
@@ -3316,7 +3316,12 @@ vect_slp_bb (basic_block bb)
{
gimple *stmt = gsi_stmt (gsi);
if (is_gimple_debug (stmt))
- continue;
+ {
+ /* Skip leading debug stmts. */
+ if (gsi_stmt (region_begin) == stmt)
+ gsi_next (®ion_begin);
+ continue;
+ }
insns++;
if (gimple_location (stmt) != UNKNOWN_LOCATION)
@@ -3325,6 +3330,8 @@ vect_slp_bb (basic_block bb)
if (!vect_find_stmt_data_reference (NULL, stmt, &datarefs))
break;
}
+ if (gsi_end_p (region_begin))
+ break;
/* Skip leading unhandled stmts. */
if (gsi_stmt (region_begin) == gsi_stmt (gsi))
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