From: Ian Romanick <ian.d.roman...@intel.com>
When reading a column from a row-major matrix, we would slot the single
value read into the vector using an ir_dereference_array of the vector
with a constant index. This will (eventually) get optimized to a
masked-write, so just generate the masked write in the first place.
Signed-off-by: Ian Romanick <ian.d.roman...@intel.com>
Cc: Eric Anholt <e...@anholt.net>
---
src/glsl/lower_ubo_reference.cpp | 9 +++------
1 file changed, 3 insertions(+), 6 deletions(-)
diff --git a/src/glsl/lower_ubo_reference.cpp b/src/glsl/lower_ubo_reference.cpp
index 026197d..9e5e951 100644
--- a/src/glsl/lower_ubo_reference.cpp
+++ b/src/glsl/lower_ubo_reference.cpp
@@ -357,17 +357,14 @@
lower_ubo_reference_visitor::emit_ubo_loads(ir_dereference *deref,
for (unsigned i = 0; i < deref->type->vector_elements; i++) {
ir_rvalue *chan = new(mem_ctx) ir_constant((int)i);
- ir_dereference *deref_chan =
- new(mem_ctx) ir_dereference_array(deref->clone(mem_ctx, NULL),
- chan);
-
ir_rvalue *chan_offset =
add(base_offset,
new(mem_ctx) ir_constant(deref_offset + i * matrix_stride));
- base_ir->insert_before(assign(deref_chan,
+ base_ir->insert_before(assign(deref->clone(mem_ctx, NULL),
ubo_load(glsl_type::float_type,
- chan_offset)));
+ chan_offset),
+ (1U << i)));
}
}
}
--
1.8.1.4
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