From: Iago Toral Quiroga <ito...@igalia.com>
This does the inverse operation of SHUFFLE_32BIT_LOAD_RESULT_TO_64BIT_DATA
and we will use it when we need to write 64-bit data in the layout expected
by untyped write messages.
Again, this needs to operate with WE_all set for the same reasons as the
inverse operation.
---
src/mesa/drivers/dri/i965/brw_fs.cpp | 42 ++++++++++++++++++++++++++++++++++++
src/mesa/drivers/dri/i965/brw_fs.h | 5 +++++
2 files changed, 47 insertions(+)
diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp
b/src/mesa/drivers/dri/i965/brw_fs.cpp
index 709e4b8..80803a6 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs.cpp
@@ -285,6 +285,48 @@ fs_visitor::SHUFFLE_32BIT_LOAD_RESULT_TO_64BIT_DATA(const
fs_builder &bld,
}
/**
+ * This helper does the inverse operation of
+ * SHUFFLE_32BIT_LOAD_RESULT_TO_64BIT_DATA.
+ *
+ * We need to do this when we are going to use untyped write messsages that
+ * operate with 32-bit components in order to arrange our 64-bit data i to be
+ * in the expected layout.
+ */
+void
+fs_visitor::SHUFFLE_32BIT_DATA_FOR_64BIT_WRITE(const fs_builder &bld,
+ const fs_reg dst,
+ const fs_reg src,
+ uint32_t components)
+{
+ int multiplier = bld.dispatch_width() / 8;
+
+ /* A temporary that we will use to shuffle the 64-bit data of each
+ * component in the vector into 32-bit data that we can write.
+ */
+ fs_reg tmp =
+ fs_reg(VGRF, alloc.allocate(2 * multiplier), BRW_REGISTER_TYPE_F);
+
+ /* We are going to operate the source in units of 32-bit */
+ fs_reg src_data = retype(src, BRW_REGISTER_TYPE_F);
+
+ /* We are going to operate on the dst in units of 64-bit */
+ fs_reg dst_data = retype(dst, BRW_REGISTER_TYPE_DF);
+
+ /* Shuffle the data */
+ for (unsigned i = 0; i < components; i++) {
+ fs_reg component_i = horiz_offset(src_data, multiplier * 16 * i);
+
+ bld.MOV(tmp, stride(component_i, 2))->force_writemask_all = true;
+ bld.MOV(horiz_offset(tmp, 8 * multiplier),
+ stride(horiz_offset(component_i, 1), 2))
+ ->force_writemask_all = true;
+
+ bld.MOV(horiz_offset(dst_data, multiplier * 8 * i),
+ retype(tmp, BRW_REGISTER_TYPE_DF))->force_writemask_all = true;
+ }
+}
+
+/**
* A helper for MOV generation for fixing up broken hardware SEND dependency
* handling.
*/
diff --git a/src/mesa/drivers/dri/i965/brw_fs.h
b/src/mesa/drivers/dri/i965/brw_fs.h
index 1e78f0c..9178347 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.h
+++ b/src/mesa/drivers/dri/i965/brw_fs.h
@@ -111,6 +111,11 @@ public:
const fs_reg src,
uint32_t components);
+ void SHUFFLE_32BIT_DATA_FOR_64BIT_WRITE(const brw::fs_builder &bld,
+ const fs_reg dst,
+ const fs_reg src,
+ uint32_t components);
+
void do_untyped_vector_read(const brw::fs_builder &bld,
const fs_reg surf_index,
const fs_reg offset_reg,
--
2.5.0
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