On Mon, Sep 14, 2020 at 08:57:18AM -0700, H.J. Lu via Gcc-patches wrote:
> Something like this for GCC 8 and 9.
Guess my preference would be to do this everywhere and then let's discuss if
we change the warning into error there or keep it being deprecated.
Though, let's see what others want to say about this.
> Add sp_is_clobbered_by_asm to rtl_data to inform backends that the stack
> pointer is clobbered by asm statement.
>
> gcc/
>
> PR target/97032
> * cfgexpand.c (asm_clobber_reg_kind): Set sp_is_clobbered_by_asm
> to true if the stack pointer is clobbered by asm statement.
> * emit-rtl.h (rtl_data): Add sp_is_clobbered_by_asm.
> * config/i386/i386.c (ix86_get_drap_rtx): Set need_drap to true
> if the stack pointer is clobbered by asm statement.
>
> gcc/testsuite/
>
> PR target/97032
> * gcc.target/i386/pr97032.c: New test.
Jakub
