https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121584
--- Comment #5 from Fei Gao <Fei.Gao2 at arm dot com> ---
(In reply to Harald van Dijk from comment #2)
> Standalone minimal test:
>
> #pragma GCC aarch64 "arm_sve.h"
> void foo() {
> svfloat32x2_t x;
> }
>
> Compile with gcc -march=armv9-a -ftrivial-auto-var-init=pattern:
>
> <source>: In function 'void foo()':
> <source>:3:17: sorry, unimplemented: __builtin_clear_padding not supported
> for variable length aggregates
> 3 | svfloat32x2_t x;
> | ^
>
> https://godbolt.org/z/rjzqedEKf
Thanks, Harald, for providing the test case!
(In reply to Andrew Pinski from comment #4)
> (In reply to Andrew Pinski from comment #3)
> > I might take a look this afternoon .
>
> This works:
> ```
> diff --git a/gcc/gimple-fold.cc b/gcc/gimple-fold.cc
> index 35c457406dc..3913e3255b3 100644
> --- a/gcc/gimple-fold.cc
> +++ b/gcc/gimple-fold.cc
> @@ -4706,6 +4706,9 @@ clear_padding_bitint_needs_padding_p (tree type)
> bool
> clear_padding_type_may_have_padding_p (tree type)
> {
> + /* Assume poly sized types don't need padding. */
> + if (POLY_INT_CST_P (TYPE_SIZE_UNIT (type)))
> + return false;
> switch (TREE_CODE (type))
> {
> case RECORD_TYPE:
>
> ```
>
> I will do some more testing and submit a patch.
Thank you, Andrew, for taking a look!
