[meta] Add CPU modes to the meta crate;

cranelift/codegen/meta/src/cdsl/isa.rs

@@ -1,12 +1,18 @@
+use crate::cdsl::cpu_modes::CpuMode;
 use crate::cdsl::inst::InstructionGroup;
 use crate::cdsl::regs::IsaRegs;
 use crate::cdsl::settings::SettingGroup;
+use crate::cdsl::xform::{TransformGroupIndex, TransformGroups};
+
+use std::collections::HashSet;
+use std::iter::FromIterator;
 
 pub struct TargetIsa {
     pub name: &'static str,
     pub instructions: InstructionGroup,
     pub settings: SettingGroup,
     pub regs: IsaRegs,
+    pub cpu_modes: Vec<CpuMode>,
 }
 
 impl TargetIsa {
@@ -15,12 +21,41 @@ impl TargetIsa {
         instructions: InstructionGroup,
         settings: SettingGroup,
         regs: IsaRegs,
+        cpu_modes: Vec<CpuMode>,
     ) -> Self {
         Self {
             name,
             instructions,
             settings,
             regs,
+            cpu_modes,
         }
     }
+
+    /// Returns a deterministically ordered, deduplicated list of TransformGroupIndex for the
+    /// transitive set of TransformGroup this TargetIsa uses.
+    pub fn transitive_transform_groups(
+        &self,
+        all_groups: &TransformGroups,
+    ) -> Vec<TransformGroupIndex> {
+        let mut set = HashSet::new();
+        for cpu_mode in &self.cpu_modes {
+            set.extend(cpu_mode.transitive_transform_groups(all_groups));
+        }
+        let mut vec = Vec::from_iter(set);
+        vec.sort();
+        vec
+    }
+
+    /// Returns a deterministically ordered, deduplicated list of TransformGroupIndex for the directly
+    /// reachable set of TransformGroup this TargetIsa uses.
+    pub fn direct_transform_groups(&self) -> Vec<TransformGroupIndex> {
+        let mut set = HashSet::new();
+        for cpu_mode in &self.cpu_modes {
+            set.extend(cpu_mode.direct_transform_groups());
+        }
+        let mut vec = Vec::from_iter(set);
+        vec.sort();
+        vec
+    }
 }