Mesa (master): aco: implement 16-bit nir_op_fexp2/nir_op_flog2

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Module: Mesa
Branch: master
Commit: ee96181ad94499c28525961a241eaf443691f5ec
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=ee96181ad94499c28525961a241eaf443691f5ec

Author: Samuel Pitoiset <samuel.pitoiset at gmail.com>
Date:   Fri Apr  3 11:12:21 2020 +0200

aco: implement 16-bit nir_op_fexp2/nir_op_flog2

Signed-off-by: Samuel Pitoiset <samuel.pitoiset at gmail.com>
Reviewed-by: Daniel Schürmann <daniel at schuermann.dev>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4452>

---

 src/amd/compiler/aco_instruction_selection.cpp | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/src/amd/compiler/aco_instruction_selection.cpp b/src/amd/compiler/aco_instruction_selection.cpp
index f86540944c7..09e3aa784c5 100644
--- a/src/amd/compiler/aco_instruction_selection.cpp
+++ b/src/amd/compiler/aco_instruction_selection.cpp
@@ -1800,8 +1800,12 @@ void visit_alu_instr(isel_context *ctx, nir_alu_instr *instr)
       break;
    }
    case nir_op_flog2: {
-      if (dst.size() == 1) {
-         emit_log2(ctx, bld, Definition(dst), get_alu_src(ctx, instr->src[0]));
+      Temp src = get_alu_src(ctx, instr->src[0]);
+      if (dst.regClass() == v2b) {
+         Temp tmp = bld.vop1(aco_opcode::v_log_f16, bld.def(v1), src);
+         bld.pseudo(aco_opcode::p_split_vector, Definition(dst), bld.def(v2b), tmp);
+      } else if (dst.regClass() == v1) {
+         emit_log2(ctx, bld, Definition(dst), src);
       } else {
          fprintf(stderr, "Unimplemented NIR instr bit size: ");
          nir_print_instr(&instr->instr, stderr);
@@ -1822,7 +1826,11 @@ void visit_alu_instr(isel_context *ctx, nir_alu_instr *instr)
       break;
    }
    case nir_op_fexp2: {
-      if (dst.size() == 1) {
+      if (dst.regClass() == v2b) {
+         Temp src = get_alu_src(ctx, instr->src[0]);
+         Temp tmp = bld.vop1(aco_opcode::v_exp_f16, bld.def(v1), src);
+         bld.pseudo(aco_opcode::p_split_vector, Definition(dst), bld.def(v2b), tmp);
+      } else if (dst.regClass() == v1) {
          emit_vop1_instruction(ctx, instr, aco_opcode::v_exp_f32, dst);
       } else {
          fprintf(stderr, "Unimplemented NIR instr bit size: ");