[Nouveau] [RFC 9/9] nv50/ir/tgsi: split mad to mul+add

[Karol Herbst]

fixes
KHR-GL44.gpu_shader5.precise_qualifier
KHR-GL45.gpu_shader5.precise_qualifier

Signed-off-by: Karol Herbst <karolherbst at gmail.com>
---
 src/gallium/drivers/nouveau/codegen/nv50_ir_from_tgsi.cpp | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/src/gallium/drivers/nouveau/codegen/nv50_ir_from_tgsi.cpp b/src/gallium/drivers/nouveau/codegen/nv50_ir_from_tgsi.cpp
index c633185893..cd45e82426 100644
--- a/src/gallium/drivers/nouveau/codegen/nv50_ir_from_tgsi.cpp
+++ b/src/gallium/drivers/nouveau/codegen/nv50_ir_from_tgsi.cpp
@@ -3184,6 +3184,20 @@ Converter::handleInstruction(const struct tgsi_full_instruction *insn)
       break;
    case TGSI_OPCODE_MAD:
    case TGSI_OPCODE_UMAD:
+      FOR_EACH_DST_ENABLED_CHANNEL(0, c, tgsi) {
+         val0 = getSSA();
+         src0 = fetchSrc(0, c);
+         src1 = fetchSrc(1, c);
+         src2 = fetchSrc(2, c);
+         geni = mkOp2(OP_MUL, dstTy, val0, src0, src1);
+         if (dstTy == TYPE_F32)
+            geni->dnz = info->io.mul_zero_wins;
+         geni->precise = insn->Instruction.Precise;
+
+         geni = mkOp2(OP_ADD, dstTy, dst0[c], val0, src2);
+         geni->precise = insn->Instruction.Precise;
+      }
+      break;
    case TGSI_OPCODE_SAD:
    case TGSI_OPCODE_FMA:
       FOR_EACH_DST_ENABLED_CHANNEL(0, c, tgsi) {
-- 
2.13.1