From: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Cast VM pointers before substraction to save the compiler
doing a smart one which includes multiplication.
v2: Only keep the first optimisation and prettify it. (Chris Wilson)
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_vma.h | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_vma.h b/drivers/gpu/drm/i915/i915_vma.h
index 21be74c61065..e3b2b3b1e056 100644
--- a/drivers/gpu/drm/i915/i915_vma.h
+++ b/drivers/gpu/drm/i915/i915_vma.h
@@ -178,15 +178,23 @@ static inline void i915_vma_put(struct i915_vma *vma)
i915_gem_object_put(vma->obj);
}
+static __always_inline ptrdiff_t ptrdiff(const void *a, const void *b)
+{
+ return a - b;
+}
+
static inline long
i915_vma_compare(struct i915_vma *vma,
struct i915_address_space *vm,
const struct i915_ggtt_view *view)
{
+ ptrdiff_t cmp;
+
GEM_BUG_ON(view && !i915_is_ggtt(vm));
- if (vma->vm != vm)
- return vma->vm - vm;
+ cmp = ptrdiff(vma->vm, vm);
+ if (cmp)
+ return cmp;
if (!view)
return vma->ggtt_view.type;
--
2.7.4
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