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 --git a/gcc/c-family/c-common.c b/gcc/c-family/c-common.c
index 4a6a4ed..a34f32f 100644 (file)
--- 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