nvc0/ir: detect i2f/i2i which operate on specific bytes/words

Some Unigine shaders have been observed to unpack bytes out of 32-bit
integers and convert them to floats. I2F/I2I can handle this sort of
thing directly. Detect the handleable situations.

This misses 16-bit word capabilities in nv50, but I haven't seen shaders
that would actually make use of that.

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

1 files changed, 1 insertions, 0 deletions

diff --git a/src/gallium/drivers/nouveau/codegen/nv50_ir_emit_gk110.cpp b/src/gallium/drivers/nouveau/codegen/nv50_ir_emit_gk110.cpp
index f06056f8f17..8f1542959c9 100644
--- a/src/gallium/drivers/nouveau/codegen/nv50_ir_emit_gk110.cpp
+++ b/src/gallium/drivers/nouveau/codegen/nv50_ir_emit_gk110.cpp
@@ -933,6 +933,7 @@ CodeEmitterGK110::emitCVT(const Instruction *i)
 
    code[0] |= typeSizeofLog2(dType) << 10;
    code[0] |= typeSizeofLog2(i->sType) << 12;
+   code[1] |= i->subOp << 12;
 
    if (isSignedIntType(dType))
       code[0] |= 0x4000;