[Mesa-dev] [PATCH 49/78] i965/nir/vec4: Implement floating-point fused multiply-add

[Eduardo Lima Mitev]

From: Antia Puentes <apuentes at igalia.com>

Adds NIR ALU operation:
   * nir_op_ffma

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=89580
---
 src/mesa/drivers/dri/i965/brw_vec4_nir.cpp | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/mesa/drivers/dri/i965/brw_vec4_nir.cpp b/src/mesa/drivers/dri/i965/brw_vec4_nir.cpp
index a13c868..cee1310 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4_nir.cpp
+++ b/src/mesa/drivers/dri/i965/brw_vec4_nir.cpp
@@ -1225,6 +1225,15 @@ vec4_visitor::nir_emit_alu(nir_alu_instr *instr)
       emit(SHR(dst, op[0], op[1]));
       break;
 
+   case nir_op_ffma:
+      op[0] = fix_3src_operand(op[0]);
+      op[1] = fix_3src_operand(op[1]);
+      op[2] = fix_3src_operand(op[2]);
+
+      inst = emit(MAD(dst, op[2], op[1], op[0]));
+      inst->saturate = instr->dest.saturate;
+      break;
+
    default:
       unreachable("Unimplemented ALU operation");
    }
-- 
2.1.4