BranchColumns

sp1_core_machine::control_flow

Struct BranchColumns 

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#[repr(C)]
pub struct BranchColumns<T> {
Show 19 fields
    pub pc: Word<T>,
    pub pc_range_checker: BabyBearWordRangeChecker<T>,
    pub next_pc: Word<T>,
    pub next_pc_range_checker: BabyBearWordRangeChecker<T>,
    pub op_a_value: Word<T>,
    pub op_b_value: Word<T>,
    pub op_c_value: Word<T>,
    pub op_a_0: T,
    pub is_beq: T,
    pub is_bne: T,
    pub is_blt: T,
    pub is_bge: T,
    pub is_bltu: T,
    pub is_bgeu: T,
    pub is_branching: T,
    pub not_branching: T,
    pub a_eq_b: T,
    pub a_gt_b: T,
    pub a_lt_b: T,

}
Expand description

The column layout for branching.

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§pc: Word<T>

The current program counter.

§pc_range_checker: BabyBearWordRangeChecker<T>§next_pc: Word<T>

The next program counter.

§next_pc_range_checker: BabyBearWordRangeChecker<T>§op_a_value: Word<T>

The value of the first operand.

§op_b_value: Word<T>

The value of the second operand.

§op_c_value: Word<T>

The value of the third operand.

§op_a_0: T

Whether the first operand is register 0.

§is_beq: T

Branch Instructions.

§is_bne: T§is_blt: T§is_bge: T§is_bltu: T§is_bgeu: T§is_branching: T

The is_branching column is equal to:

is_beq & a_eq_b || is_bne & (a_lt_b | a_gt_b) || (is_blt | is_bltu) & a_lt_b || (is_bge | is_bgeu) & (a_eq_b | a_gt_b)

§not_branching: T

The not branching column is equal to:

is_beq & !a_eq_b || is_bne & !(a_lt_b | a_gt_b) || (is_blt | is_bltu) & !a_lt_b || (is_bge | is_bgeu) & !(a_eq_b | a_gt_b)

Note that we probably can do away with this column and just use !is_branching. However, the branching related constraints were auditted twice when they were part of the CPU table, so I’m preserving those columns/constraints for now.

§a_eq_b: T

Whether a equals b.

§a_gt_b: T

Whether a is greater than b.

§a_lt_b: T

Whether a is less than b.

Trait Implementations§

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impl<T> Borrow<BranchColumns<T>> for [T]

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fn borrow(&self) -> &BranchColumns<T>

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<BranchColumns<T>> for [T]

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fn borrow_mut(&mut self) -> &mut BranchColumns<T>

Mutably borrows from an owned value. Read more
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impl<T: Clone> Clone for BranchColumns<T>

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fn clone(&self) -> BranchColumns<T>

Returns a duplicate of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<T: Debug> Debug for BranchColumns<T>

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl<T: Default> Default for BranchColumns<T>

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fn default() -> BranchColumns<T>

Returns the “default value” for a type. Read more
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impl<T: Copy> Copy for BranchColumns<T>

Auto Trait Implementations§

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impl<T> Freeze for BranchColumns<T>
where T: Freeze,

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impl<T> RefUnwindSafe for BranchColumns<T>
where T: RefUnwindSafe,

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impl<T> Send for BranchColumns<T>
where T: Send,

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impl<T> Sync for BranchColumns<T>
where T: Sync,

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impl<T> Unpin for BranchColumns<T>
where T: Unpin,

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impl<T> UnwindSafe for BranchColumns<T>
where T: UnwindSafe,

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impl<T> Any for T
where T: 'static + ?Sized,

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Gets the TypeId of self. Read more
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where T: ?Sized,

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Immutably borrows from an owned value. Read more
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where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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where T: Clone,

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unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dest. Read more
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