Vector indexing leaves us with ARRAY_REFs of VIEW_CONVERT_EXPRs,
sth which array_at_struct_end_p considers a array-at-struct-end
even when there's an underlying decl visible. The following fixes
the latter.
Bootstrapped and tested on x86_64-unknown-linux-gnu, pushed.
2021-05-17 Richard Biener <rguent...@suse.de>
PR middle-end/100582
* tree.c (array_at_struct_end_p): Get to the base of the
reference before looking for the underlying decl.
* gcc.target/i386/pr100582.c: New testcase.
---
gcc/testsuite/gcc.target/i386/pr100582.c | 16 ++++++++++++++++
gcc/tree.c | 8 +++-----
2 files changed, 19 insertions(+), 5 deletions(-)
create mode 100644 gcc/testsuite/gcc.target/i386/pr100582.c
diff --git a/gcc/testsuite/gcc.target/i386/pr100582.c
b/gcc/testsuite/gcc.target/i386/pr100582.c
new file mode 100644
index 00000000000..9520fe7a197
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr100582.c
@@ -0,0 +1,16 @@
+/* { dg-do compile } */
+/* { dg-options "-O3 -mavx2" } */
+
+typedef unsigned char v32qi __attribute__((vector_size(32)));
+
+v32qi
+f2 (v32qi x, v32qi a, v32qi b)
+{
+ v32qi e;
+ for (int i = 0; i != 32; i++)
+ e[i] = x[i] ? a[i] : b[i];
+
+ return e;
+}
+
+/* { dg-final { scan-assembler-times "pblendvb" 1 } } */
diff --git a/gcc/tree.c b/gcc/tree.c
index 01eda553a65..8afba598eb5 100644
--- a/gcc/tree.c
+++ b/gcc/tree.c
@@ -12550,13 +12550,11 @@ array_at_struct_end_p (tree ref)
|| ! TYPE_MAX_VALUE (TYPE_DOMAIN (atype)))
return true;
- if (TREE_CODE (ref) == MEM_REF
- && TREE_CODE (TREE_OPERAND (ref, 0)) == ADDR_EXPR)
- ref = TREE_OPERAND (TREE_OPERAND (ref, 0), 0);
-
/* If the reference is based on a declared entity, the size of the array
is constrained by its given domain. (Do not trust commons PR/69368). */
- if (DECL_P (ref)
+ ref = get_base_address (ref);
+ if (ref
+ && DECL_P (ref)
&& !(flag_unconstrained_commons
&& VAR_P (ref) && DECL_COMMON (ref))
&& DECL_SIZE_UNIT (ref)
--
2.26.2
