The pass is currently turning this :
mul(16) %17:F, %1:F, 0.5f
mul(16) %19:F, %1:F, -0.5f
(+f0.0) sel(16) %27:UD, %19:UD, %17:UD
into this :
{ 12} mul(16) %17:F, %1:F, 0.5f
{ 14} (+f0.0) sel(16) %27:UD, -%17:F, %17:UD
The type change in the SEL instruction incurs a type conversion that
produces invalid values.
Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Fixes: 234c45c929 ("intel/brw: Write a new global CSE pass that works on defs")
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/12477
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/33070>
2e4dcf72c6