From: Samuel Iglesias Gonsálvez <sigles...@igalia.com>
It is not supported directly in the HW, we need to convert to float32
first as intermediate step.
Signed-off-by: Samuel Iglesias Gonsálvez <sigles...@igalia.com>
---
src/intel/compiler/brw_fs_nir.cpp | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/src/intel/compiler/brw_fs_nir.cpp
b/src/intel/compiler/brw_fs_nir.cpp
index dd8e5191f4e..fb5ad7a614a 100644
--- a/src/intel/compiler/brw_fs_nir.cpp
+++ b/src/intel/compiler/brw_fs_nir.cpp
@@ -755,6 +755,23 @@ fs_visitor::nir_emit_alu(const fs_builder &bld,
nir_alu_instr *instr)
*/
case nir_op_f2f16_undef:
+ /* BDW PRM, vol02, Command Reference Instructions, mov - MOVE:
+ *
+ * "There is no direct conversion from HF to DF or DF to HF.
+ * Use two instructions and F (Float) as an intermediate type.
+ *
+ * There is no direct conversion from HF to Q/UQ or Q/UQ to HF.
+ * Use two instructions and F (Float) or a word integer type
+ * or a DWord integer type as an intermediate type."
+ */
+ if (nir_src_bit_size(instr->src[0].src) == 64) {
+ fs_reg tmp = bld.vgrf(BRW_REGISTER_TYPE_F, 1);
+ inst = bld.MOV(tmp, op[0]);
+ inst->saturate = instr->dest.saturate;
+ inst = bld.MOV(result, tmp);
+ inst->saturate = instr->dest.saturate;
+ break;
+ }
inst = bld.MOV(result, op[0]);
inst->saturate = instr->dest.saturate;
break;
--
2.14.1
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