The following makes sure to strip type conversions added by
build_fold_addr_expr before placing the result in a call argument.
Bootstrapped and tested on x86_64-unknown-linux-gnu, pushed.
PR tree-optimization/114246
* tree-ssa-dse.cc (increment_start_addr): Strip useless
type conversions from the adjusted address.
* gcc.dg/torture/pr114246.c: New testcase.
---
gcc/testsuite/gcc.dg/torture/pr114246.c | 11 +++++++++++
gcc/tree-ssa-dse.cc | 2 ++
2 files changed, 13 insertions(+)
create mode 100644 gcc/testsuite/gcc.dg/torture/pr114246.c
diff --git a/gcc/testsuite/gcc.dg/torture/pr114246.c
b/gcc/testsuite/gcc.dg/torture/pr114246.c
new file mode 100644
index 00000000000..eb20db594cd
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/torture/pr114246.c
@@ -0,0 +1,11 @@
+/* { dg-do compile } */
+/* { dg-additional-options "-w" } */
+
+int a, b;
+
+void
+foo (void)
+{
+ __builtin_memcpy (&a, (char *)&b - 1, 2);
+ __builtin_memcpy (&a, &b, 1);
+}
diff --git a/gcc/tree-ssa-dse.cc b/gcc/tree-ssa-dse.cc
index 7c348516ddf..fce4fc76a56 100644
--- a/gcc/tree-ssa-dse.cc
+++ b/gcc/tree-ssa-dse.cc
@@ -49,6 +49,7 @@ along with GCC; see the file COPYING3. If not see
#include "cfgloop.h"
#include "tree-data-ref.h"
#include "internal-fn.h"
+#include "tree-ssa.h"
/* This file implements dead store elimination.
@@ -658,6 +659,7 @@ increment_start_addr (gimple *stmt, tree *where, int
increment)
*where,
build_int_cst (ptr_type_node,
increment)));
+ STRIP_USELESS_TYPE_CONVERSION (*where);
}
/* STMT is builtin call that writes bytes in bitmap ORIG, some bytes are dead
--
2.35.3
