kraid: Support signless IAdd

Signed and unsigned types are only allowed for IADD and not IADD_IMM so
it's simpler if we support signless for regular IADD.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/41841>

src/panfrost/compiler/kraid/data_type.rs

@@ -108,6 +108,14 @@ impl DataType {
         DataType::from_pieces(1, num_type, bits)
     }
 
+    pub const fn i_as_u(self) -> DataType {
+        let (comps, mut num_type, bits) = self.to_pieces();
+        if matches!(num_type, Some(NumericType::Integer)) {
+            num_type = Some(NumericType::UnsignedInteger);
+        }
+        DataType::from_pieces(comps, num_type, bits)
+    }
+
     pub fn bits(&self) -> Option<NonZeroU8> {
         NonZeroU8::new(self.to_pieces().2)
     }

src/panfrost/compiler/kraid/encode_v9.rs

@@ -459,7 +459,7 @@ impl V9Instr for OpIAdd {
         if let SrcRef::Imm32(_) = &self.srcs[1].src_ref {
             IaddImm::get_info(self.dst_type.try_into().ok()?, arch)
         } else {
-            Iadd::get_info(self.dst_type.try_into().ok()?, arch)
+            Iadd::get_info(self.dst_type.i_as_u().try_into().ok()?, arch)
         }
     }
 
@@ -473,7 +473,7 @@ impl V9Instr for OpIAdd {
             })
         } else {
             e.encode(Iadd {
-                variant: self.dst_type.try_into().unwrap(),
+                variant: self.dst_type.i_as_u().try_into().unwrap(),
                 dst: op_encode_dst(self, &self.dst),
                 src0: op_encode_src(self, &self.srcs[0]),
                 src1: op_encode_src(self, &self.srcs[1]),

src/panfrost/compiler/kraid/nir.rs

@@ -352,7 +352,7 @@ impl<'a> ShaderFromNir<'a> {
             nir_op_iadd => {
                 b.push_op(OpIAdd {
                     dst: dst.into(),
-                    dst_type: dst_type(NumericType::UnsignedInteger),
+                    dst_type: dst_type(NumericType::Integer),
                     saturate: false,
                     srcs: [srcs(0), srcs(1)],
                 });

src/panfrost/compiler/kraid/ops.rs

@@ -205,7 +205,7 @@ impl fmt::Display for OpFCmp {
 
 #[repr(C)]
 #[derive(Clone, Opcode)]
-#[variants(dst_type in [S16, U16, V2S16, V2U16, S32, U32])]
+#[variants(dst_type in [I16, S16, U16, V2I16, V2S16, V2U16, I32, S32, U32])]
 pub struct OpIAdd {
     pub dst: Dst,
     pub dst_type: DataType,