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use std::collections::HashSet;
use std::iter::FromIterator;
use crate::cdsl::cpu_modes::CpuMode;
use crate::cdsl::instructions::{InstructionGroup, InstructionPredicateMap};
use crate::cdsl::recipes::Recipes;
use crate::cdsl::regs::IsaRegs;
use crate::cdsl::settings::SettingGroup;
use crate::cdsl::xform::{TransformGroupIndex, TransformGroups};
pub(crate) struct TargetIsa {
pub name: &'static str,
pub instructions: InstructionGroup,
pub settings: SettingGroup,
pub regs: IsaRegs,
pub recipes: Recipes,
pub cpu_modes: Vec<CpuMode>,
pub encodings_predicates: InstructionPredicateMap,
/// TransformGroupIndex are global to all the ISAs, while we want to have indices into the
/// local array of transform groups that are directly used. We use this map to get this
/// information.
pub local_transform_groups: Vec<TransformGroupIndex>,
}
impl TargetIsa {
pub fn new(
name: &'static str,
instructions: InstructionGroup,
settings: SettingGroup,
regs: IsaRegs,
recipes: Recipes,
cpu_modes: Vec<CpuMode>,
encodings_predicates: InstructionPredicateMap,
) -> Self {
// Compute the local TransformGroup index.
let mut local_transform_groups = Vec::new();
for cpu_mode in &cpu_modes {
let transform_groups = cpu_mode.direct_transform_groups();
for group_index in transform_groups {
// find() is fine here: the number of transform group is < 5 as of June 2019.
if local_transform_groups
.iter()
.find(|&val| group_index == *val)
.is_none()
{
local_transform_groups.push(group_index);
}
}
}
Self {
name,
instructions,
settings,
regs,
recipes,
cpu_modes,
encodings_predicates,
local_transform_groups,
}
}
/// 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 &root in self.local_transform_groups.iter() {
set.insert(root);
let mut base = root;
// Follow the chain of chain_with.
while let Some(chain_with) = &all_groups.get(base).chain_with {
set.insert(*chain_with);
base = *chain_with;
}
}
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> {
&self.local_transform_groups
}
pub fn translate_group_index(&self, group_index: TransformGroupIndex) -> usize {
self.local_transform_groups
.iter()
.position(|&val| val == group_index)
.expect("TransformGroup unused by this TargetIsa!")
}
}
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