https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96566

--- Comment #12 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Tom de Vries from comment #6)
> (In reply to Jakub Jelinek from comment #3)
> > Either the test can be skipped on nvptx or any targets that don't emit
> > something like a .zero similar directive, 

How about this:
...
diff --git a/gcc/testsuite/gcc.dg/builtin-object-size-21.c
b/gcc/testsuite/gcc.dg/builtin-object-size-21.c
index 1c42374ba89..7e0f85ffdf3 100644
--- a/gcc/testsuite/gcc.dg/builtin-object-size-21.c
+++ b/gcc/testsuite/gcc.dg/builtin-object-size-21.c
@@ -1,7 +1,8 @@
 /* PR middle-end/92815 - spurious -Wstringop-overflow writing into
    a flexible array of an extern struct
    { dg-do compile }
-   { dg-options "-Wall -fdump-tree-optimized" } */
+   { dg-options "-Wall -fdump-tree-optimized" }
+   { dg-require-effective-target large_initializer } */

 #define PTRDIFF_MAX __PTRDIFF_MAX__

diff --git a/gcc/testsuite/gcc.dg/strlenopt-55.c
b/gcc/testsuite/gcc.dg/strlenopt-55.c
index ea6fb22a2ed..ca89ecd3c53 100644
--- a/gcc/testsuite/gcc.dg/strlenopt-55.c
+++ b/gcc/testsuite/gcc.dg/strlenopt-55.c
@@ -3,7 +3,8 @@

    Verify that strlen() of braced initialized array is folded
    { dg-do compile }
-   { dg-options "-O1 -Wall -fdump-tree-gimple -fdump-tree-optimized" } */
+   { dg-options "-O1 -Wall -fdump-tree-gimple -fdump-tree-optimized" }
+   { dg-require-effective-target large_initializer } */

 #include "strlenopt.h"

diff --git a/gcc/testsuite/lib/target-supports.exp
b/gcc/testsuite/lib/target-supports.exp
index e79015b4d54..4e0d45aaae5 100644
--- a/gcc/testsuite/lib/target-supports.exp
+++ b/gcc/testsuite/lib/target-supports.exp
@@ -10424,3 +10424,14 @@ proc check_effective_target_msp430_large {} {
        #endif
     } ""]
 }
+
+# Return 1 if the target has an efficient means to encode large initializers
+# in the assembly.
+
+proc check_effective_target_large_initializer { } {
+    if { [istarget nvptx*-*-*] } {
+       return 0
+    }
+
+    return 1
+}
...

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