[Mesa-dev] [PATCH v2] i965/fs: Enable rounding mode on f2f16 ops

[Alejandro Piñeiro]

By default we don't set the rounding mode. We only set
round-to-near-even or round-to-zero mode if explicitly set from nir.

v2: Use a single SHADER_OPCODE_RND_MODE opcode taking an immediate
    with the rounding mode (Curro)

Signed-off-by: Jose Maria Casanova Crespo <jmcasanova at igalia.com>
Signed-off-by: Alejandro Piñeiro <apinheiro at igalia.com>
---
 src/intel/compiler/brw_fs_nir.cpp | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/intel/compiler/brw_fs_nir.cpp b/src/intel/compiler/brw_fs_nir.cpp
index a356327c690..7b06cb139d6 100644
--- a/src/intel/compiler/brw_fs_nir.cpp
+++ b/src/intel/compiler/brw_fs_nir.cpp
@@ -717,6 +717,14 @@ fs_visitor::nir_emit_alu(const fs_builder &bld, nir_alu_instr *instr)
       inst->saturate = instr->dest.saturate;
       break;
 
+   case nir_op_f2f16_rtne:
+   case nir_op_f2f16_rtz:
+      if (instr->op == nir_op_f2f16_rtz)
+         bld.emit(SHADER_OPCODE_RND_MODE, bld.null_reg_ud(), brw_imm_d(BRW_RND_MODE_RTZ));
+      else if (instr->op == nir_op_f2f16_rtne)
+         bld.emit(SHADER_OPCODE_RND_MODE, bld.null_reg_ud(), brw_imm_d(BRW_RND_MODE_RTNE));
+      /* fallthrough */
+
    case nir_op_f2f16:
       /* In theory, it would be better to use BRW_OPCODE_F32TO16. Depending
        * on the HW gen, it is a special hw opcode or just a MOV, and
-- 
2.11.0