The warning is falsely triggered for THREAD_SELF in glibc when
accessing TCB through the segment register.
gcc/ChangeLog:
* gimple-array-bounds.cc
(array_bounds_checker::check_mem_ref): Bail out for
non-generic address spaces.
gcc/testsuite/ChangeLog:
* gcc.target/i386/addr-space-3.c: New test case.
Signed-off-by: Siddhesh Poyarekar <siddh...@gotplt.org>
---
gcc/gimple-array-bounds.cc | 3 +++
gcc/testsuite/gcc.target/i386/addr-space-3.c | 5 +++++
2 files changed, 8 insertions(+)
create mode 100644 gcc/testsuite/gcc.target/i386/addr-space-3.c
diff --git a/gcc/gimple-array-bounds.cc b/gcc/gimple-array-bounds.cc
index 0517e5ddd8e..36fc1dbe3f8 100644
--- a/gcc/gimple-array-bounds.cc
+++ b/gcc/gimple-array-bounds.cc
@@ -432,6 +432,9 @@ array_bounds_checker::check_mem_ref (location_t location,
tree ref,
if (aref.offset_in_range (axssize))
return false;
+ if (!ADDR_SPACE_GENERIC_P (TYPE_ADDR_SPACE (axstype)))
+ return false;
+
if (TREE_CODE (aref.ref) == SSA_NAME)
{
gimple *def = SSA_NAME_DEF_STMT (aref.ref);
diff --git a/gcc/testsuite/gcc.target/i386/addr-space-3.c
b/gcc/testsuite/gcc.target/i386/addr-space-3.c
new file mode 100644
index 00000000000..4bd940e696a
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/addr-space-3.c
@@ -0,0 +1,5 @@
+/* Verify that __seg_fs/gs marked variables do not trigger an array bounds
+ warning. */
+/* { dg-do compile */
+/* { dg-options "-O2 -Warray-bounds" } */
+#include "addr-space-2.c"
--
2.31.1
