v2: Only lower bitfieldInsert to BFM+BFI (and don't lower
bitfieldExtract at all) since three-source instructions are now
usable in the vertex shader.
---
src/mesa/drivers/dri/i965/brw_shader.cpp | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/src/mesa/drivers/dri/i965/brw_shader.cpp
b/src/mesa/drivers/dri/i965/brw_shader.cpp
index 5addff6..efe7151 100644
--- a/src/mesa/drivers/dri/i965/brw_shader.cpp
+++ b/src/mesa/drivers/dri/i965/brw_shader.cpp
@@ -151,6 +151,15 @@ brw_link_shader(struct gl_context *ctx, struct
gl_shader_program *shProg)
* must precede lower_instructions().
*/
brw_lower_packing_builtins(brw, (gl_shader_type) stage, shader->ir);
+
+ /* bitfield lowering passes insert subtraction instructions which need
+ * to be lowered, so it must precede lower_instructions(SUB_TO_ADD_NEG).
+ */
+ int bitfield_insert = intel->gen >= 7
+ ? BITFIELD_INSERT_TO_BFM_BFI
+ : 0;
+ lower_instructions(shader->ir, bitfield_insert);
+
do_mat_op_to_vec(shader->ir);
const int lrp_to_arith = intel->gen < 6 ? LRP_TO_ARITH : 0;
lower_instructions(shader->ir,
--
1.8.1.5
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