On Oct 29, 2024, at 4:08 PM, Alexandre Oliva <[email protected]> wrote:
>
> When we select a non-bx get_pc_thunk, we get an extra mov to set up
> the PIC register before the abort call. Expect that mov or a
> get_pc_thunk.bx call.
>
> Regstrapped on x86_64-linux-gnu; also tested on i686-linux-gnu with
> -fPIE. Ok to install?
Ok. Usually I leave view to target folks for target specific changes that are
well understood by target on well maintained targets.
Target folks sometimes want to weigh in with obscure stuff.
> for gcc/testsuite/ChangeLog
>
> * gcc.target/i386/pr70321.c: Cope with non-bx get_pc_thunk.
> ---
> gcc/testsuite/gcc.target/i386/pr70321.c | 6 +++++-
> 1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/gcc/testsuite/gcc.target/i386/pr70321.c
> b/gcc/testsuite/gcc.target/i386/pr70321.c
> index 58f5f5661c7a2..287b7da1b9501 100644
> --- a/gcc/testsuite/gcc.target/i386/pr70321.c
> +++ b/gcc/testsuite/gcc.target/i386/pr70321.c
> @@ -9,4 +9,8 @@ void foo (long long ixi)
>
> /* { dg-final { scan-assembler-times "mov" 1 { target nonpic } } } */
> /* get_pc_thunk adds an extra mov insn. */
> -/* { dg-final { scan-assembler-times "mov" 2 { target { ! nonpic } } } } */
> +/* Choosing a non-bx get_pc_thunk requires another mov before the abort call.
> + So we require a match of either that mov or the get_pc_thunk.bx call, in
> + addition to the other 2 movs. (Hopefully there won't be more calls for a
> + false positive.) */
> +/* { dg-final { scan-assembler-times "mov|call\[^\n\r]*get_pc_thunk\.bx" 3 {
> target { ! nonpic } } } } */
