[Mesa-dev] [PATCH] nvc0/ir: fix subops for IMAD

[Samuel Pitoiset]

Offset was wrong, it's at bit 8, not 4. Also, uses subr instead
of sub when src2 has neg. Similar to GK110 now.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset at gmail.com>
Cc: mesa-stable at lists.freedesktop.org
---
 src/gallium/drivers/nouveau/codegen/nv50_ir_emit_nvc0.cpp | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/src/gallium/drivers/nouveau/codegen/nv50_ir_emit_nvc0.cpp b/src/gallium/drivers/nouveau/codegen/nv50_ir_emit_nvc0.cpp
index 47b4e7a..3ed70b5 100644
--- a/src/gallium/drivers/nouveau/codegen/nv50_ir_emit_nvc0.cpp
+++ b/src/gallium/drivers/nouveau/codegen/nv50_ir_emit_nvc0.cpp
@@ -736,9 +736,15 @@ CodeEmitterNVC0::emitUADD(const Instruction *i)
 void
 CodeEmitterNVC0::emitIMAD(const Instruction *i)
 {
+   uint8_t addOp =
+      (i->src(2).mod.neg() << 1) | (i->src(0).mod.neg() ^ i->src(1).mod.neg());
+
    assert(i->encSize == 8);
    emitForm_A(i, HEX64(20000000, 00000003));
 
+   assert(addOp != 3);
+   code[1] |= addOp << 8;
+
    if (isSignedType(i->dType))
       code[0] |= 1 << 7;
    if (isSignedType(i->sType))
@@ -749,10 +755,6 @@ CodeEmitterNVC0::emitIMAD(const Instruction *i)
    if (i->flagsDef >= 0) code[1] |= 1 << 16;
    if (i->flagsSrc >= 0) code[1] |= 1 << 23;
 
-   if (i->src(2).mod.neg()) code[0] |= 0x10;
-   if (i->src(1).mod.neg() ^
-       i->src(0).mod.neg()) code[0] |= 0x20;
-
    if (i->subOp == NV50_IR_SUBOP_MUL_HIGH)
       code[0] |= 1 << 6;
 }
-- 
2.8.0