nvc0: add support for VOTE tgsi opcodes

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>

docs/relnotes/12.1.0.html

@@ -44,7 +44,7 @@ Note: some of the new features are only available with certain drivers.
 </p>
 
 <ul>
-TBD
+<li>GL_ARB_shader_group_vote on nvc0</li>
 </ul>
 
 <h2>Bug fixes</h2>

src/gallium/drivers/nouveau/codegen/nv50_ir_emit_gk110.cpp

@@ -1481,16 +1481,31 @@ CodeEmitterGK110::emitFlow(const Instruction *i)
 void
 CodeEmitterGK110::emitVOTE(const Instruction *i)
 {
-   assert(i->src(0).getFile() == FILE_PREDICATE &&
+   assert(i->src(0).getFile() == FILE_PREDICATE);
-          i->def(1).getFile() == FILE_PREDICATE);
 
    code[0] = 0x00000002;
    code[1] = 0x86c00000 | (i->subOp << 19);
 
    emitPredicate(i);
 
-   defId(i->def(0), 2);
+   unsigned rp = 0;
-   defId(i->def(1), 48);
+   for (int d = 0; i->defExists(d); d++) {
+      if (i->def(d).getFile() == FILE_PREDICATE) {
+         assert(!(rp & 2));
+         rp |= 2;
+         defId(i->def(d), 48);
+      } else if (i->def(d).getFile() == FILE_GPR) {
+         assert(!(rp & 1));
+         rp |= 1;
+         defId(i->def(d), 2);
+      } else {
+         assert(!"Unhandled def");
+      }
+   }
+   if (!(rp & 1))
+      code[0] |= 255 << 2;
+   if (!(rp & 2))
+      code[1] |= 7 << 16;
    if (i->src(0).mod == Modifier(NV50_IR_MOD_NOT))
       code[1] |= 1 << 13;
    srcId(i->src(0), 42);

src/gallium/drivers/nouveau/codegen/nv50_ir_emit_gm107.cpp

@@ -2788,23 +2788,26 @@ CodeEmitterGM107::emitMEMBAR()
 void
 CodeEmitterGM107::emitVOTE()
 {
-   int subOp;
+   assert(insn->src(0).getFile() == FILE_PREDICATE);
 
-   assert(insn->src(0).getFile() == FILE_PREDICATE &&
+   int r = -1, p = -1;
-          insn->def(1).getFile() == FILE_PREDICATE);
+   for (int i = 0; insn->defExists(i); i++) {
-
+      if (insn->def(i).getFile() == FILE_GPR)
-   switch (insn->subOp) {
+         r = i;
-   case NV50_IR_SUBOP_VOTE_ANY: subOp = 1; break;
+      else if (insn->def(i).getFile() == FILE_PREDICATE)
-   default:
+         p = i;
-      assert(insn->subOp == NV50_IR_SUBOP_VOTE_ALL);
-      subOp = 0;
-      break;
    }
 
    emitInsn (0x50d80000);
-   emitField(0x30, 2, subOp);
+   emitField(0x30, 2, insn->subOp);
-   emitGPR  (0x00, insn->def(0));
+   if (r >= 0)
-   emitPRED (0x2d, insn->def(1));
+      emitGPR  (0x00, insn->def(r));
+   else
+      emitGPR  (0x00);
+   if (p >= 0)
+      emitPRED (0x2d, insn->def(p));
+   else
+      emitPRED (0x2d);
    emitField(0x2a, 1, insn->src(0).mod == Modifier(NV50_IR_MOD_NOT));
    emitPRED (0x27, insn->src(0));
 }

src/gallium/drivers/nouveau/codegen/nv50_ir_emit_nvc0.cpp

@@ -2472,16 +2472,31 @@ CodeEmitterNVC0::emitPIXLD(const Instruction *i)
 void
 CodeEmitterNVC0::emitVOTE(const Instruction *i)
 {
-   assert(i->src(0).getFile() == FILE_PREDICATE &&
+   assert(i->src(0).getFile() == FILE_PREDICATE);
-          i->def(1).getFile() == FILE_PREDICATE);
 
    code[0] = 0x00000004 | (i->subOp << 5);
    code[1] = 0x48000000;
 
    emitPredicate(i);
 
-   defId(i->def(0), 14);
+   unsigned rp = 0;
-   defId(i->def(1), 32 + 22);
+   for (int d = 0; i->defExists(d); d++) {
+      if (i->def(d).getFile() == FILE_PREDICATE) {
+         assert(!(rp & 2));
+         rp |= 2;
+         defId(i->def(d), 32 + 22);
+      } else if (i->def(d).getFile() == FILE_GPR) {
+         assert(!(rp & 1));
+         rp |= 1;
+         defId(i->def(d), 14);
+      } else {
+         assert(!"Unhandled def");
+      }
+   }
+   if (!(rp & 1))
+      code[0] |= 63 << 14;
+   if (!(rp & 2))
+      code[1] |= 7 << 22;
    if (i->src(0).mod == Modifier(NV50_IR_MOD_NOT))
       code[0] |= 1 << 23;
    srcId(i->src(0), 20);

src/gallium/drivers/nouveau/codegen/nv50_ir_from_tgsi.cpp

@@ -548,6 +548,9 @@ nv50_ir::DataType Instruction::inferSrcType() const
    case TGSI_OPCODE_UBFE:
    case TGSI_OPCODE_UMSB:
    case TGSI_OPCODE_UP2H:
+   case TGSI_OPCODE_VOTE_ALL:
+   case TGSI_OPCODE_VOTE_ANY:
+   case TGSI_OPCODE_VOTE_EQ:
       return nv50_ir::TYPE_U32;
    case TGSI_OPCODE_I2F:
    case TGSI_OPCODE_I2D:
@@ -835,6 +838,10 @@ static nv50_ir::operation translateOpcode(uint opcode)
    NV50_IR_OPCODE_CASE(IMSB, BFIND);
    NV50_IR_OPCODE_CASE(UMSB, BFIND);
 
+   NV50_IR_OPCODE_CASE(VOTE_ALL, VOTE);
+   NV50_IR_OPCODE_CASE(VOTE_ANY, VOTE);
+   NV50_IR_OPCODE_CASE(VOTE_EQ, VOTE);
+
    NV50_IR_OPCODE_CASE(END, EXIT);
 
    default:
@@ -861,6 +868,9 @@ static uint16_t opcodeToSubOp(uint opcode)
    case TGSI_OPCODE_IMUL_HI:
    case TGSI_OPCODE_UMUL_HI:
       return NV50_IR_SUBOP_MUL_HIGH;
+   case TGSI_OPCODE_VOTE_ALL: return NV50_IR_SUBOP_VOTE_ALL;
+   case TGSI_OPCODE_VOTE_ANY: return NV50_IR_SUBOP_VOTE_ANY;
+   case TGSI_OPCODE_VOTE_EQ: return NV50_IR_SUBOP_VOTE_UNI;
    default:
       return 0;
    }
@@ -3187,6 +3197,17 @@ Converter::handleInstruction(const struct tgsi_full_instruction *insn)
          mkCmp(op, tgsi.getSetCond(), dstTy, dst0[c], srcTy, src0, src1);
       }
       break;
+   case TGSI_OPCODE_VOTE_ALL:
+   case TGSI_OPCODE_VOTE_ANY:
+   case TGSI_OPCODE_VOTE_EQ:
+      val0 = new_LValue(func, FILE_PREDICATE);
+      FOR_EACH_DST_ENABLED_CHANNEL(0, c, tgsi) {
+         mkCmp(OP_SET, CC_NE, TYPE_U32, val0, TYPE_U32, fetchSrc(0, c), zero);
+         mkOp1(op, dstTy, val0, val0)
+            ->subOp = tgsi::opcodeToSubOp(tgsi.getOpcode());
+         mkCvt(OP_CVT, TYPE_U32, dst0[c], TYPE_U8, val0);
+      }
+      break;
    case TGSI_OPCODE_KILL_IF:
       val0 = new_LValue(func, FILE_PREDICATE);
       mask = 0;

src/gallium/drivers/nouveau/nvc0/nvc0_screen.c

@@ -230,11 +230,11 @@ nvc0_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
    case PIPE_CAP_CULL_DISTANCE:
    case PIPE_CAP_PRIMITIVE_RESTART_FOR_PATCHES:
    case PIPE_CAP_ROBUST_BUFFER_ACCESS_BEHAVIOR:
+   case PIPE_CAP_COMPUTE:
+   case PIPE_CAP_TGSI_VOTE:
       return 1;
    case PIPE_CAP_SEAMLESS_CUBE_MAP_PER_TEXTURE:
       return (class_3d >= NVE4_3D_CLASS) ? 1 : 0;
-   case PIPE_CAP_COMPUTE:
-      return 1;
    case PIPE_CAP_PREFER_BLIT_BASED_TEXTURE_TRANSFER:
       return nouveau_screen(pscreen)->vram_domain & NOUVEAU_BO_VRAM ? 1 : 0;
 
@@ -261,7 +261,6 @@ nvc0_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
    case PIPE_CAP_PCI_BUS:
    case PIPE_CAP_PCI_DEVICE:
    case PIPE_CAP_PCI_FUNCTION:
-   case PIPE_CAP_TGSI_VOTE:
       return 0;
 
    case PIPE_CAP_VENDOR_ID: