Mesa (master): nvc0/ir: fix LSB/BFE/BFI implementations

[Ilia Mirkin]

Module: Mesa
Branch: master
Commit: 60f5766db48fe81f55f4b7be47c2be27bdbe2c10
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=60f5766db48fe81f55f4b7be47c2be27bdbe2c10

Author: Ilia Mirkin <imirkin at alum.mit.edu>
Date:   Fri Apr  7 20:17:47 2017 -0400

nvc0/ir: fix LSB/BFE/BFI implementations

Overwriting the src register is a very bad idea - it logically maps onto
the TGSI registers, and so is effectively overwriting the source values.

Reported-by: Boyan Ding <boyan.j.ding at gmail.com>
Signed-off-by: Ilia Mirkin <imirkin at alum.mit.edu>
Cc: mesa-stable at lists.freedesktop.org

---

 .../drivers/nouveau/codegen/nv50_ir_from_tgsi.cpp     | 19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)

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 13625bf3bd..5eecce7534 100644
--- a/src/gallium/drivers/nouveau/codegen/nv50_ir_from_tgsi.cpp
+++ b/src/gallium/drivers/nouveau/codegen/nv50_ir_from_tgsi.cpp
@@ -3761,16 +3761,17 @@ Converter::handleInstruction(const struct tgsi_full_instruction *insn)
    case TGSI_OPCODE_UBFE:
       FOR_EACH_DST_ENABLED_CHANNEL(0, c, tgsi) {
          src0 = fetchSrc(0, c);
+         val0 = getScratch();
          if (tgsi.getSrc(1).getFile() == TGSI_FILE_IMMEDIATE &&
              tgsi.getSrc(2).getFile() == TGSI_FILE_IMMEDIATE) {
-            src1 = loadImm(NULL, tgsi.getSrc(2).getValueU32(c, info) << 8 |
-                           tgsi.getSrc(1).getValueU32(c, info));
+            loadImm(val0, (tgsi.getSrc(2).getValueU32(c, info) << 8) |
+                    tgsi.getSrc(1).getValueU32(c, info));
          } else {
             src1 = fetchSrc(1, c);
             src2 = fetchSrc(2, c);
-            mkOp3(OP_INSBF, TYPE_U32, src1, src2, mkImm(0x808), src1);
+            mkOp3(OP_INSBF, TYPE_U32, val0, src2, mkImm(0x808), src1);
          }
-         mkOp2(OP_EXTBF, dstTy, dst0[c], src0, src1);
+         mkOp2(OP_EXTBF, dstTy, dst0[c], src0, val0);
       }
       break;
    case TGSI_OPCODE_BFI:
@@ -3779,16 +3780,18 @@ Converter::handleInstruction(const struct tgsi_full_instruction *insn)
          src1 = fetchSrc(1, c);
          src2 = fetchSrc(2, c);
          src3 = fetchSrc(3, c);
-         mkOp3(OP_INSBF, TYPE_U32, src2, src3, mkImm(0x808), src2);
-         mkOp3(OP_INSBF, TYPE_U32, dst0[c], src1, src2, src0);
+         val0 = getScratch();
+         mkOp3(OP_INSBF, TYPE_U32, val0, src3, mkImm(0x808), src2);
+         mkOp3(OP_INSBF, TYPE_U32, dst0[c], src1, val0, src0);
       }
       break;
    case TGSI_OPCODE_LSB:
       FOR_EACH_DST_ENABLED_CHANNEL(0, c, tgsi) {
          src0 = fetchSrc(0, c);
-         geni = mkOp2(OP_EXTBF, TYPE_U32, src0, src0, mkImm(0x2000));
+         val0 = getScratch();
+         geni = mkOp2(OP_EXTBF, TYPE_U32, val0, src0, mkImm(0x2000));
          geni->subOp = NV50_IR_SUBOP_EXTBF_REV;
-         geni = mkOp1(OP_BFIND, TYPE_U32, dst0[c], src0);
+         geni = mkOp1(OP_BFIND, TYPE_U32, dst0[c], val0);
          geni->subOp = NV50_IR_SUBOP_BFIND_SAMT;
       }
       break;