From 966995d9117d8d805b1aa992571d076500e3c347 Mon Sep 17 00:00:00 2001
From: Kenneth Graunke <kenneth@whitecape.org>
Date: Tue, 7 Mar 2023 20:40:11 -0800
Subject: [PATCH] intel/fs: Add builder helpers for F32TO16/F16TO32 that work
 on Gfx7.x

These take care of emitting the F32TO16/F16TO32 instructions on Gfx7.x
but otherwise just emit a type converting MOV on Gfx8+.

Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Sagar Ghuge <sagar.ghuge@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/21783>
---
 src/intel/compiler/brw_fs_builder.h | 32 +++++++++++++++++++++++++++--
 1 file changed, 30 insertions(+), 2 deletions(-)

diff --git a/src/intel/compiler/brw_fs_builder.h b/src/intel/compiler/brw_fs_builder.h
index d2d8d5e7ef0..8fb01cfd670 100644
--- a/src/intel/compiler/brw_fs_builder.h
+++ b/src/intel/compiler/brw_fs_builder.h
@@ -627,8 +627,6 @@ namespace brw {
       ALU2(DP3)
       ALU2(DP4)
       ALU2(DPH)
-      ALU1(F16TO32)
-      ALU1(F32TO16)
       ALU1(FBH)
       ALU1(FBL)
       ALU1(FRC)
@@ -661,6 +659,36 @@ namespace brw {
 #undef ALU2_ACC
 #undef ALU2
 #undef ALU1
+
+      instruction *
+      F32TO16(const dst_reg &dst, const src_reg &src) const
+      {
+         assert(dst.type == BRW_REGISTER_TYPE_HF);
+         assert(src.type == BRW_REGISTER_TYPE_F);
+
+         if (shader->devinfo->ver >= 8) {
+            return MOV(dst, src);
+         } else {
+            assert(shader->devinfo->ver == 7);
+            return emit(BRW_OPCODE_F32TO16,
+                        retype(dst, BRW_REGISTER_TYPE_W), src);
+         }
+      }
+
+      instruction *
+      F16TO32(const dst_reg &dst, const src_reg &src) const
+      {
+         assert(dst.type == BRW_REGISTER_TYPE_F);
+         assert(src.type == BRW_REGISTER_TYPE_HF);
+
+         if (shader->devinfo->ver >= 8) {
+            return MOV(dst, src);
+         } else {
+            assert(shader->devinfo->ver == 7);
+            return emit(BRW_OPCODE_F32TO16,
+                        dst, retype(src, BRW_REGISTER_TYPE_W));
+         }
+      }
       /** @} */
 
       /**