nvc0/ir: cache vertex out base so that we don't recompute again

The global CSE pass stinks and is unable to pull this out. Easy enough
to handle it here and avoid generating unnecessary special register
loads (which can allegedly be quite slow).

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>

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 3c558e9..4847a0f 100644 (file)
--- a/src/gallium/drivers/nouveau/codegen/nv50_ir_from_tgsi.cpp
+++ b/src/gallium/drivers/nouveau/codegen/nv50_ir_from_tgsi.cpp
@@ -1394,6 +1394,8 @@ private:
    Value *vtxBase[5]; // base address of vertex in primitive (for TP/GP)
    uint8_t vtxBaseValid;
 
+   Value *outBase; // base address of vertex out patch (for TCP)
+
    Stack condBBs;  // fork BB, then else clause BB
    Stack joinBBs;  // fork BB, for inserting join ops on ENDIF
    Stack loopBBs;  // loop headers
@@ -1537,13 +1539,7 @@ Converter::getOutputBase(int s)
                          fetchSrc(tgsi.getSrc(s).getIndirect(1), 0, NULL),
                          offset);
       vtxBaseValid |= 1 << s;
-      vtxBase[s] = mkOp2v(
-         OP_ADD, TYPE_U32, getSSA(),
-         mkOp2v(
-            OP_SUB, TYPE_U32, getSSA(),
-            mkOp1v(OP_RDSV, TYPE_U32, getSSA(), mkSysVal(SV_LANEID, 0)),
-            mkOp1v(OP_RDSV, TYPE_U32, getSSA(), mkSysVal(SV_INVOCATION_ID, 0))),
-         offset);
+      vtxBase[s] = mkOp2v(OP_ADD, TYPE_U32, getSSA(), outBase, offset);
    }
    return vtxBase[s];
 }
@@ -3369,10 +3365,21 @@ Converter::run()
          clipVtx[c] = getScratch();
    }
 
-   if (prog->getType() == Program::TYPE_FRAGMENT) {
+   switch (prog->getType()) {
+   case Program::TYPE_TESSELLATION_CONTROL:
+      outBase = mkOp2v(
+         OP_SUB, TYPE_U32, getSSA(),
+         mkOp1v(OP_RDSV, TYPE_U32, getSSA(), mkSysVal(SV_LANEID, 0)),
+         mkOp1v(OP_RDSV, TYPE_U32, getSSA(), mkSysVal(SV_INVOCATION_ID, 0)));
+      break;
+   case Program::TYPE_FRAGMENT: {
       Symbol *sv = mkSysVal(SV_POSITION, 3);
       fragCoord[3] = mkOp1v(OP_RDSV, TYPE_F32, getSSA(), sv);
       mkOp1(OP_RCP, TYPE_F32, fragCoord[3], fragCoord[3]);
+      break;
+   }
+   default:
+      break;
    }
 
    if (info->io.viewportId >= 0)