nak: Legalize Op[FI]Setp

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/24998>

src/nouveau/compiler/nak_ir.rs

@@ -769,6 +769,24 @@ pub enum FloatCmpOp {
     IsNan,
 }
 
+impl FloatCmpOp {
+    pub fn flip(self) -> FloatCmpOp {
+        match self {
+            FloatCmpOp::OrdEq | FloatCmpOp::OrdNe => self,
+            FloatCmpOp::OrdLt => FloatCmpOp::OrdGt,
+            FloatCmpOp::OrdLe => FloatCmpOp::OrdGe,
+            FloatCmpOp::OrdGt => FloatCmpOp::OrdLt,
+            FloatCmpOp::OrdGe => FloatCmpOp::OrdLe,
+            FloatCmpOp::UnordEq | FloatCmpOp::UnordNe => self,
+            FloatCmpOp::UnordLt => FloatCmpOp::UnordGt,
+            FloatCmpOp::UnordLe => FloatCmpOp::UnordGe,
+            FloatCmpOp::UnordGt => FloatCmpOp::UnordLt,
+            FloatCmpOp::UnordGe => FloatCmpOp::UnordLe,
+            FloatCmpOp::IsNum | FloatCmpOp::IsNan => panic!("Cannot flip unop"),
+        }
+    }
+}
+
 impl fmt::Display for FloatCmpOp {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         match self {
@@ -800,6 +818,18 @@ pub enum IntCmpOp {
     Ge,
 }
 
+impl IntCmpOp {
+    pub fn flip(self) -> IntCmpOp {
+        match self {
+            IntCmpOp::Eq | IntCmpOp::Ne => self,
+            IntCmpOp::Lt => IntCmpOp::Gt,
+            IntCmpOp::Le => IntCmpOp::Ge,
+            IntCmpOp::Gt => IntCmpOp::Lt,
+            IntCmpOp::Ge => IntCmpOp::Le,
+        }
+    }
+}
+
 impl fmt::Display for IntCmpOp {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         match self {

src/nouveau/compiler/nak_legalize.rs

@@ -90,6 +90,14 @@ impl<'a> LegalizeInstr<'a> {
                 self.swap_srcs_if_not_reg(src0, src1);
                 self.mov_src_if_not_reg(src0, RegFile::GPR);
             }
+            Op::FSetP(op) => {
+                let [ref mut src0, ref mut src1] = op.srcs;
+                if !src_is_reg(src0) && src_is_reg(src1) {
+                    std::mem::swap(src0, src1);
+                    op.cmp_op = op.cmp_op.flip();
+                }
+                self.mov_src_if_not_reg(src0, RegFile::GPR);
+            }
             Op::IAdd3(op) => {
                 let [ref mut src0, ref mut src1, ref mut src2] = op.srcs;
                 self.swap_srcs_if_not_reg(src0, src1);
@@ -103,6 +111,14 @@ impl<'a> LegalizeInstr<'a> {
                 self.mov_src_if_not_reg(src0, RegFile::GPR);
                 self.mov_src_if_not_reg(src2, RegFile::GPR);
             }
+            Op::ISetP(op) => {
+                let [ref mut src0, ref mut src1] = op.srcs;
+                if !src_is_reg(src0) && src_is_reg(src1) {
+                    std::mem::swap(src0, src1);
+                    op.cmp_op = op.cmp_op.flip();
+                }
+                self.mov_src_if_not_reg(src0, RegFile::GPR);
+            }
             Op::Lop3(op) => {
                 /* Fold constants if we can */
                 op.op = LogicOp::new_lut(&|mut x, mut y, mut z| {