67a0f2532f
When an exec write isn't used but writes other registers
besides exec, and also reads exec (such as s_and_saveexec),
we would mistakenly delete the previous instruction that
writes the exec value that this instruction uses.
No Fossil DB changes on Rembrandt (GFX10.3).
Fixes: 0211e66f65
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/9036
Signed-off-by: Timur Kristóf <timur.kristof@gmail.com>
Reviewed-by: Georg Lehmann <dadschoorse@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/23576>