Mesa (main): zink: break out offset alignment calculation into helper

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Module: Mesa
Branch: main
Commit: 18c22f502439ff3d3be6738ca86a0ffc19961670
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=18c22f502439ff3d3be6738ca86a0ffc19961670

Author: Mike Blumenkrantz <michael.blumenkrantz at gmail.com>
Date:   Wed Jun  9 16:15:03 2021 -0400

zink: break out offset alignment calculation into helper

Acked-by: Dave Airlie <airlied at redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/11437>

---

 src/gallium/drivers/zink/zink_resource.c | 26 ++++++++++++++++----------
 1 file changed, 16 insertions(+), 10 deletions(-)

diff --git a/src/gallium/drivers/zink/zink_resource.c b/src/gallium/drivers/zink/zink_resource.c
index 9a5b7fad404..e1387636f29 100644
--- a/src/gallium/drivers/zink/zink_resource.c
+++ b/src/gallium/drivers/zink/zink_resource.c
@@ -779,20 +779,26 @@ zink_resource_has_usage(struct zink_resource *res, enum zink_resource_access usa
    return batch_uses & usage;
 }
 
+ALWAYS_INLINE static void
+align_offset_size(const VkDeviceSize alignment, VkDeviceSize *offset, VkDeviceSize *size, VkDeviceSize obj_size)
+{
+   VkDeviceSize align = *offset % alignment;
+   if (alignment - 1 > *offset)
+      *offset = 0;
+   else
+      *offset -= align, *size += align;
+   align = alignment - (*size % alignment);
+   if (*offset + *size + align > obj_size)
+      *size = obj_size - *offset;
+   else
+      *size += align;
+}
+
 static VkMappedMemoryRange
 init_mem_range(struct zink_screen *screen, struct zink_resource *res, VkDeviceSize offset, VkDeviceSize size)
 {
    assert(res->obj->size);
-   VkDeviceSize align = offset % screen->info.props.limits.nonCoherentAtomSize;
-   if (screen->info.props.limits.nonCoherentAtomSize - 1 > offset)
-      offset = 0;
-   else
-      offset -= align, size += align;
-   align = screen->info.props.limits.nonCoherentAtomSize - (size % screen->info.props.limits.nonCoherentAtomSize);
-   if (offset + size + align > res->obj->size)
-      size = res->obj->size - offset;
-   else
-      size += align;
+   align_offset_size(screen->info.props.limits.nonCoherentAtomSize, &offset, &size, res->obj->size);
    VkMappedMemoryRange range = {
       VK_STRUCTURE_TYPE_MAPPED_MEMORY_RANGE,
       NULL,