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* [gcc r11-9229] tree-optimization/102798 - avoid copying PTA info to old SSA names
@ 2021-11-08 13:32 Richard Biener
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From: Richard Biener @ 2021-11-08 13:32 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:1631d6d2910e03e4517079d6e6ad0ae1aeb24dfa
commit r11-9229-g1631d6d2910e03e4517079d6e6ad0ae1aeb24dfa
Author: Richard Biener <rguenther@suse.de>
Date: Mon Oct 18 09:10:43 2021 +0200
tree-optimization/102798 - avoid copying PTA info to old SSA names
The vectorizer duplicates pointer-info to created pointer bases
but it has to avoid changing points-to info on existing SSA names
because there's now flow-sensitive info in there (pt->pt_null as
set from VRP).
2021-10-18 Richard Biener <rguenther@suse.de>
PR tree-optimization/102798
* tree-vect-data-refs.c (vect_create_addr_base_for_vector_ref):
Only copy points-to info to newly generated SSA names.
* gcc.dg/pr102798.c: New testcase.
Diff:
---
gcc/testsuite/gcc.dg/pr102798.c | 41 +++++++++++++++++++++++++++++++++++++++++
gcc/tree-vect-data-refs.c | 3 ++-
2 files changed, 43 insertions(+), 1 deletion(-)
diff --git a/gcc/testsuite/gcc.dg/pr102798.c b/gcc/testsuite/gcc.dg/pr102798.c
new file mode 100644
index 00000000000..3a50546a16b
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr102798.c
@@ -0,0 +1,41 @@
+/* { dg-do run } */
+/* { dg-options "-O3 -fno-tree-pta" } */
+
+typedef __SIZE_TYPE__ size_t;
+
+__attribute__((__noipa__))
+void BUF_reverse (unsigned char *out, const unsigned char *in, size_t size)
+{
+ size_t i;
+ if (in)
+ {
+ out += size - 1;
+ for (i = 0; i < size; i++)
+ *out++ = *in++;
+ }
+ else
+ {
+ unsigned char *q;
+ char c;
+ q = out + size - 1;
+ for (i = 0; i < size ; i++)
+ {
+ *out++ = 1;
+ }
+ }
+}
+
+int
+main (void)
+{
+ unsigned char buf[40];
+ unsigned char buf1[40];
+ for (unsigned i = 0; i < sizeof (buf); i++)
+ buf[i] = i;
+ BUF_reverse (buf, 0, sizeof (buf));
+ for (unsigned i = 0; i < sizeof (buf); i++)
+ if (buf[i] != 1)
+ __builtin_abort ();
+
+ return 0;
+}
diff --git a/gcc/tree-vect-data-refs.c b/gcc/tree-vect-data-refs.c
index 23f4a7ef15f..e18afb2b657 100644
--- a/gcc/tree-vect-data-refs.c
+++ b/gcc/tree-vect-data-refs.c
@@ -4701,7 +4701,8 @@ vect_create_addr_base_for_vector_ref (vec_info *vinfo, stmt_vec_info stmt_info,
if (DR_PTR_INFO (dr)
&& TREE_CODE (addr_base) == SSA_NAME
- && !SSA_NAME_PTR_INFO (addr_base))
+ /* We should only duplicate pointer info to newly created SSA names. */
+ && SSA_NAME_VAR (addr_base) == dest)
{
vect_duplicate_ssa_name_ptr_info (addr_base, dr_info);
if (offset || byte_offset)
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