[PATCH] c/104002 - shufflevector variable indexing

[Richard Biener via Gcc-patches]

Variable indexing of a __builtin_shufflevector result is broken because
we fail to properly mark the TARGET_EXPR decl as addressable.

Bootstrapped and tested on x86_64-unknown-linux-gnu, OK?

Thanks,
Richard.

2022-01-13  Richard Biener  <rguent...@suse.de>

        PR c/104002
gcc/c-family/
        * c-common.c (c_common_mark_addressable_vec): Handle TARGET_EXPR.

gcc/testsuite/
        * c-c++-common/builtin-shufflevector-3.c: Move ...
        * c-c++-common/torture/builtin-shufflevector-3.c: ... here.
---
 gcc/c-family/c-common.c                                      | 5 ++++-
 .../c-c++-common/{ => torture}/builtin-shufflevector-3.c     | 0
 2 files changed, 4 insertions(+), 1 deletion(-)
 rename gcc/testsuite/c-c++-common/{ => torture}/builtin-shufflevector-3.c 
(100%)

diff --git a/gcc/c-family/c-common.c b/gcc/c-family/c-common.c
index 4a6a4edb763..a34f32f51a4 100644
--- a/gcc/c-family/c-common.c
+++ b/gcc/c-family/c-common.c
@@ -6989,12 +6989,15 @@ c_common_mark_addressable_vec (tree t)
     }
   if (!VAR_P (t)
       && TREE_CODE (t) != PARM_DECL
-      && TREE_CODE (t) != COMPOUND_LITERAL_EXPR)
+      && TREE_CODE (t) != COMPOUND_LITERAL_EXPR
+      && TREE_CODE (t) != TARGET_EXPR)
     return;
   if (!VAR_P (t) || !DECL_HARD_REGISTER (t))
     TREE_ADDRESSABLE (t) = 1;
   if (TREE_CODE (t) == COMPOUND_LITERAL_EXPR)
     TREE_ADDRESSABLE (COMPOUND_LITERAL_EXPR_DECL (t)) = 1;
+  else if (TREE_CODE (t) == TARGET_EXPR)
+    TREE_ADDRESSABLE (TARGET_EXPR_SLOT (t)) = 1;
 }
 
 
diff --git a/gcc/testsuite/c-c++-common/builtin-shufflevector-3.c 
b/gcc/testsuite/c-c++-common/torture/builtin-shufflevector-3.c
similarity index 100%
rename from gcc/testsuite/c-c++-common/builtin-shufflevector-3.c
rename to gcc/testsuite/c-c++-common/torture/builtin-shufflevector-3.c
-- 
2.31.1