[gcc r12-6551] c/104002 - shufflevector variable indexing

[gcc r12-6551] c/104002 - shufflevector variable indexing

[Richard Biener]

https://gcc.gnu.org/g:f45a2232bc8d6b88f52859cac502611395f3caf5

commit r12-6551-gf45a2232bc8d6b88f52859cac502611395f3caf5
Author: Richard Biener <rguenther@suse.de>
Date:   Thu Jan 13 11:55:14 2022 +0100

    c/104002 - shufflevector variable indexing
    
    Variable indexing of a __builtin_shufflevector result is broken because
    we fail to properly mark the TARGET_EXPR decl as addressable.
    
    2022-01-13  Richard Biener  <rguenther@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.

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

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