r600: implement callstack workaround for evergreen.
This is ported from the sb backend, there are some issues with
evergreen stacks on the boundary between entries and ALU_PUSH_BEFORE
instructions.
Whenever we are going to use a push before, we check the stack
usage and if we have to use the workaround, then we switch to
a separate push.
I noticed this problem dealing with some of the soft fp64 shaders,
in nosb mode, they are quite stack happy.
This fixes all the glitches and inconsistencies I've seen with them
Reviewed-by: Roland Scheidegger <sroland@vmware.com>
Tested-by: Elie Tournier <elie.tournier@collabora.com>
Cc: <mesa-stable@lists.freedesktop.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>
(cherry picked from commit 5d4fbc2b54cb2aaea1cbb52ec087f31009f3ac76)
[Juan A. Suarez: resolve trivial conflicts]
Signed-off-by: Juan A. Suarez Romero <jasuarez@igalia.com>
Conflicts:
src/gallium/drivers/r600/r600_shader.c
1 file changed
