On Wed, Aug 4, 2021 at 3:20 PM H.J. Lu <hjl.to...@gmail.com> wrote:
>
> To avoid stack realignment, call ix86_gen_scratch_sse_rtx to get a
> scratch SSE register to copy data with with SSE register from one
> memory location to another.
>
> gcc/
>
> PR target/101772
> * config/i386/i386-expand.c (ix86_expand_vector_move): Call
> ix86_gen_scratch_sse_rtx to get a scratch SSE register to copy
> data with SSE register from one memory location to another.
>
> gcc/testsuite/
>
> PR target/101772
> * gcc.target/i386/eh_return-2.c: New test.
LGTM.
Thanks,
Uros.
> ---
> gcc/config/i386/i386-expand.c | 6 +++++-
> gcc/testsuite/gcc.target/i386/eh_return-2.c | 16 ++++++++++++++++
> 2 files changed, 21 insertions(+), 1 deletion(-)
> create mode 100644 gcc/testsuite/gcc.target/i386/eh_return-2.c
>
> diff --git a/gcc/config/i386/i386-expand.c b/gcc/config/i386/i386-expand.c
> index 1d469bf7221..bd21efa9530 100644
> --- a/gcc/config/i386/i386-expand.c
> +++ b/gcc/config/i386/i386-expand.c
> @@ -613,7 +613,11 @@ ix86_expand_vector_move (machine_mode mode, rtx
> operands[])
> arguments in memory. */
> if (!register_operand (op0, mode)
> && !register_operand (op1, mode))
> - op1 = force_reg (mode, op1);
> + {
> + rtx scratch = ix86_gen_scratch_sse_rtx (mode);
> + emit_move_insn (scratch, op1);
> + op1 = scratch;
> + }
>
> tmp[0] = op0; tmp[1] = op1;
> ix86_expand_vector_move_misalign (mode, tmp);
> diff --git a/gcc/testsuite/gcc.target/i386/eh_return-2.c
> b/gcc/testsuite/gcc.target/i386/eh_return-2.c
> new file mode 100644
> index 00000000000..f23f4492dac
> --- /dev/null
> +++ b/gcc/testsuite/gcc.target/i386/eh_return-2.c
> @@ -0,0 +1,16 @@
> +/* PR target/101772 */
> +/* { dg-do compile } */
> +/* { dg-additional-options "-O0 -march=x86-64 -mstackrealign" } */
> +
> +struct _Unwind_Context _Unwind_Resume_or_Rethrow_this_context;
> +
> +void offset (int);
> +
> +struct _Unwind_Context {
> + void *reg[7];
> +} _Unwind_Resume_or_Rethrow() {
> + struct _Unwind_Context cur_contextcur_context =
> + _Unwind_Resume_or_Rethrow_this_context;
> + offset(0);
> + __builtin_eh_return ((long) offset, 0);
> +}
> --
> 2.31.1
>
