On Fri, May 06, 2016 at 03:18:16PM +0100, Tvrtko Ursulin wrote:
>
> On 06/05/16 15:00, Ville Syrjälä wrote:
> > On Fri, May 06, 2016 at 02:43:50PM +0100, Tvrtko Ursulin wrote:
> >> From: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
> >>
> >> If we allow it a dedicated flag in dev_priv we enable the
> >> compiler to nicely optimize conditions like IS_HASSWELL ||
> >> IS_BROADWELL.
> >>
> >> Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
> >> ---
> >> drivers/gpu/drm/i915/i915_drv.c | 4 ++++
> >> drivers/gpu/drm/i915/i915_drv.h | 3 ++-
> >> 2 files changed, 6 insertions(+), 1 deletion(-)
> >>
> >> diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
> >> index 9fd221c97275..da6532da44e3 100644
> >> --- a/drivers/gpu/drm/i915/i915_drv.c
> >> +++ b/drivers/gpu/drm/i915/i915_drv.c
> >> @@ -300,22 +300,26 @@ static const struct intel_device_info intel_haswell_m_info = {
> >> static const struct intel_device_info intel_broadwell_d_info = {
> >> BDW_FEATURES,
> >> .gen = 8,
> >> + .is_broadwell = 1,
> >> };
> >>
> >> static const struct intel_device_info intel_broadwell_m_info = {
> >> BDW_FEATURES,
> >> .gen = 8, .is_mobile = 1,
> >> + .is_broadwell = 1,
> >> };
> >>
> >> static const struct intel_device_info intel_broadwell_gt3d_info = {
> >> BDW_FEATURES,
> >> .gen = 8,
> >> + .is_broadwell = 1,
> >> .ring_mask = RENDER_RING | BSD_RING | BLT_RING | VEBOX_RING | BSD2_RING,
> >> };
> >>
> >> static const struct intel_device_info intel_broadwell_gt3m_info = {
> >> BDW_FEATURES,
> >> .gen = 8, .is_mobile = 1,
> >> + .is_broadwell = 1,
> >> .ring_mask = RENDER_RING | BSD_RING | BLT_RING | VEBOX_RING | BSD2_RING,
> >> };
> >>
> >> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> >> index c6351016eaf0..459561991081 100644
> >> --- a/drivers/gpu/drm/i915/i915_drv.h
> >> +++ b/drivers/gpu/drm/i915/i915_drv.h
> >> @@ -735,6 +735,7 @@ struct intel_csr {
> >> func(is_valleyview) sep \
> >> func(is_cherryview) sep \
> >> func(is_haswell) sep \
> >> + func(is_broadwell) sep \
> >> func(is_skylake) sep \
> >> func(is_broxton) sep \
> >> func(is_kabylake) sep \
> >
> > We could just replace all of these with a single enum and save a bunch
> > of space.
>
> Bitfield is really nice here because compiler can then merge tests like
> IS_HASWELL || IS_BROADWELL into a single test instruction.
Most if not all of those are in modeset code so I'm not entirely
convinced micro-optimizing that is all that useful.
Bunch of times I've just wished I could write 'whatever >= G4X' instead
of 'IS_G4X || gen >= 5' simply for readability.
>
> Regards,
>
> Tvrtko
>
> >
> >> @@ -2553,7 +2554,7 @@ struct drm_i915_cmd_table {
> >> #define IS_VALLEYVIEW(dev) (INTEL_INFO(dev)->is_valleyview)
> >> #define IS_CHERRYVIEW(dev) (INTEL_INFO(dev)->is_cherryview)
> >> #define IS_HASWELL(dev) (INTEL_INFO(dev)->is_haswell)
> >> -#define IS_BROADWELL(dev) (!INTEL_INFO(dev)->is_cherryview && IS_GEN8(dev))
> >> +#define IS_BROADWELL(dev) (INTEL_INFO(dev)->is_broadwell)
> >> #define IS_SKYLAKE(dev) (INTEL_INFO(dev)->is_skylake)
> >> #define IS_BROXTON(dev) (INTEL_INFO(dev)->is_broxton)
> >> #define IS_KABYLAKE(dev) (INTEL_INFO(dev)->is_kabylake)
> >> --
> >> 1.9.1
> >>
> >> _______________________________________________
> >> Intel-gfx mailing list
> >> Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
> >> https://lists.freedesktop.org/mailman/listinfo/intel-gfx
> >
--
Ville Syrjälä
Intel OTC
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