[Mesa-dev] [PATCH 3/6] i965/fs: Implement nir_opcode_fsub/isub support.

[Kenneth Graunke]

prog_to_nir uses this for OPCODE_SUB.

Signed-off-by: Kenneth Graunke <kenneth at whitecape.org>
---
 src/mesa/drivers/dri/i965/brw_fs_nir.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/mesa/drivers/dri/i965/brw_fs_nir.cpp b/src/mesa/drivers/dri/i965/brw_fs_nir.cpp
index 69f296c..094303f 100644
--- a/src/mesa/drivers/dri/i965/brw_fs_nir.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_nir.cpp
@@ -905,6 +905,12 @@ fs_visitor::nir_emit_alu(nir_alu_instr *instr)
       inst->saturate = instr->dest.saturate;
       break;
 
+   case nir_op_fsub:
+   case nir_op_isub:
+      inst = emit(ADD(result, op[0], negate(op[1])));
+      inst->saturate = instr->dest.saturate;
+      break;
+
    case nir_op_fmul:
       inst = emit(MUL(result, op[0], op[1]));
       inst->saturate = instr->dest.saturate;
-- 
2.3.3