[PATCH] Always use TYPE_MODE instead of DECL_MODE for vector field

[H.J. Lu via Gcc-patches]

commit e034c5c895722e0092d2239cd8c2991db77d6d39
Author: Jakub Jelinek <ja...@redhat.com>
Date:   Sat Dec 2 08:54:47 2017 +0100

        PR target/78643
        PR target/80583
        * expr.c (get_inner_reference): If DECL_MODE of a non-bitfield
        is BLKmode for vector field with vector raw mode, use TYPE_MODE
        instead of DECL_MODE.

fixed the case where DECL_MODE of a vector field is BLKmode and its
TYPE_MODE is a vector mode because of target attribute.  Remove the
BLKmode check for the case where DECL_MODE of a vector field is a vector
mode and its TYPE_MODE is BLKmode because of target attribute.

gcc/

        PR target/107304
        * expr.c (get_inner_reference): Always use TYPE_MODE for vector
        field with vector raw mode.

gcc/testsuite/

        PR target/107304
        * gcc.target/i386/pr107304.c: New test.
---
 gcc/expr.cc                              |  3 +-
 gcc/testsuite/gcc.target/i386/pr107304.c | 39 ++++++++++++++++++++++++
 2 files changed, 40 insertions(+), 2 deletions(-)
 create mode 100644 gcc/testsuite/gcc.target/i386/pr107304.c

diff --git a/gcc/expr.cc b/gcc/expr.cc
index efe387e6173..9145193c2c1 100644
--- a/gcc/expr.cc
+++ b/gcc/expr.cc
@@ -7905,8 +7905,7 @@ get_inner_reference (tree exp, poly_int64_pod *pbitsize,
          /* For vector fields re-check the target flags, as DECL_MODE
             could have been set with different target flags than
             the current function has.  */
-         if (mode == BLKmode
-             && VECTOR_TYPE_P (TREE_TYPE (field))
+         if (VECTOR_TYPE_P (TREE_TYPE (field))
              && VECTOR_MODE_P (TYPE_MODE_RAW (TREE_TYPE (field))))
            mode = TYPE_MODE (TREE_TYPE (field));
        }
diff --git a/gcc/testsuite/gcc.target/i386/pr107304.c 
b/gcc/testsuite/gcc.target/i386/pr107304.c
new file mode 100644
index 00000000000..24d68795e7f
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr107304.c
@@ -0,0 +1,39 @@
+/* { dg-do compile } */
+/* { dg-options "-O0 -march=tigerlake" } */
+
+#include <stdint.h>
+
+typedef union {
+  uint8_t v __attribute__((aligned(256))) __attribute__ ((vector_size(64 * 
sizeof(uint8_t))));
+  uint8_t i[64] __attribute__((aligned(256)));
+} stress_vec_u8_64_t;
+
+typedef struct {
+ struct {
+  stress_vec_u8_64_t s;
+  stress_vec_u8_64_t o;
+  stress_vec_u8_64_t mask1;
+  stress_vec_u8_64_t mask2;
+ } u8_64;
+} stress_vec_data_t;
+
+__attribute__((target_clones("arch=alderlake", "default"))) 
+void
+stress_vecshuf_u8_64(stress_vec_data_t *data)
+{
+  stress_vec_u8_64_t *__restrict s;
+  stress_vec_u8_64_t *__restrict mask1;
+  stress_vec_u8_64_t *__restrict mask2;
+  register int i;
+
+  s = &data->u8_64.s;
+  mask1 = &data->u8_64.mask1;
+  mask2 = &data->u8_64.mask2;
+
+  for (i = 0; i < 256; i++) {  /* was i < 65536 */
+      stress_vec_u8_64_t tmp;
+
+      tmp.v = __builtin_shuffle(s->v, mask1->v);
+      s->v = __builtin_shuffle(tmp.v, mask2->v);
+  }
+}
-- 
2.37.3