The overlaps_def() method tests if a definition would conflict with the
live range.
The reaches_use() method tests if a live range is live at an
instruction.
The overlaps_def() method tests if a definition would conflict with the
live range.
The reaches_use() method tests if a live range is live at an
instruction.
* Clarify that extended basic blocks are abbreviated as EBB.
* Fix typo.
* Fix a typo.
* Fix typos.
* Use the same phrase to indicate scalar-only as other places in the doc.
* Mention that `band_imm` and friends are scalar-only.
And mention that they're equivalent to their respective
non-immediate-form counterparts.
* Clarify that extended basic blocks are abbreviated as EBB.
* Fix typo.
* Fix a typo.
* Fix typos.
* Use the same phrase to indicate scalar-only as other places in the doc.
* Mention that `band_imm` and friends are scalar-only.
And mention that they're equivalent to their respective
non-immediate-form counterparts.
The EntityRef trait is used by more than just the EntityMap now, so it
should live in its own module.
Also move the entity_impl! macro into the new module so it can be used
for defining new entity references anywhere.
The EntityRef trait is used by more than just the EntityMap now, so it
should live in its own module.
Also move the entity_impl! macro into the new module so it can be used
for defining new entity references anywhere.
* Replace a single-character string literal with a character literal.
* Use is_some() instead of comparing with Some(_).
* Add code-quotes around type names in comments.
* Use !...is_empty() instead of len() != 0.
* Tidy up redundant returns.
* Remove redundant .clone() calls.
* Remove unnecessary explicit lifetime parameters.
* Tidy up unnecessary '&'s.
* Add parens to make operator precedence explicit.
* Use debug_assert_eq instead of debug_assert with ==.
* Replace a &Vec argument with a &[...].
* Replace `a = a op b` with `a op= b`.
* Avoid unnecessary closures.
* Avoid .iter() and .iter_mut() for iterating over containers.
* Remove unneeded qualification.
* Replace a single-character string literal with a character literal.
* Use is_some() instead of comparing with Some(_).
* Add code-quotes around type names in comments.
* Use !...is_empty() instead of len() != 0.
* Tidy up redundant returns.
* Remove redundant .clone() calls.
* Remove unnecessary explicit lifetime parameters.
* Tidy up unnecessary '&'s.
* Add parens to make operator precedence explicit.
* Use debug_assert_eq instead of debug_assert with ==.
* Replace a &Vec argument with a &[...].
* Replace `a = a op b` with `a op= b`.
* Avoid unnecessary closures.
* Avoid .iter() and .iter_mut() for iterating over containers.
* Remove unneeded qualification.
* Implement an iterator over encodings
* Implement TargetIsa::legal_encodings
* Exclude non-boolean settings of isa flags bytes
* Address flake8 long line error
* Implement an iterator over encodings
* Implement TargetIsa::legal_encodings
* Exclude non-boolean settings of isa flags bytes
* Address flake8 long line error
As soon as a value is spilled, also assign it to a spill slot.
For now, create a new spill slot for each spilled value. In the future,
values will be sharing spill slots of they are phi-related.
As soon as a value is spilled, also assign it to a spill slot.
For now, create a new spill slot for each spilled value. In the future,
values will be sharing spill slots of they are phi-related.
Use a new StackSlots struct to keep track of a function's stack slots
instead of just an entity map. This let's us build more internal data
structures for tracking the stack slots if necessary.
Start by adding a make_spill_slot() function that will be used by the
register allocator.
Use a new StackSlots struct to keep track of a function's stack slots
instead of just an entity map. This let's us build more internal data
structures for tracking the stack slots if necessary.
Start by adding a make_spill_slot() function that will be used by the
register allocator.
Add a StackSlotKind enumeration to help keep track of the different
kinds of stack slots supported:
- Incoming and outgoing function arguments on the stack.
- Spill slots and locals.
Change the text format syntax for declaring a stack slot to use a kind
keyword rather than just 'stack_slot'.
Add a StackSlotKind enumeration to help keep track of the different
kinds of stack slots supported:
- Incoming and outgoing function arguments on the stack.
- Spill slots and locals.
Change the text format syntax for declaring a stack slot to use a kind
keyword rather than just 'stack_slot'.
An instruction may have fixed operand constraints that make it
impossibly to use a single register value to satisfy two at a time.
Detect when the same value is used for multiple fixed register operands
and insert copies during the spilling pass.
An instruction may have fixed operand constraints that make it
impossibly to use a single register value to satisfy two at a time.
Detect when the same value is used for multiple fixed register operands
and insert copies during the spilling pass.
Even if an argument is already in the correct register, make sure that
we detect conflicts by registering the no-op move. This also means that
the ABI argument register won't be turned into a variable for the
solver.
Even if an argument is already in the correct register, make sure that
we detect conflicts by registering the no-op move. This also means that
the ABI argument register won't be turned into a variable for the
solver.
Add a spilling pass which lowers register pressure by assigning SSA
values to the stack. Important missing features:
- Resolve conflicts where an instruction uses the same value more than
once in incompatible ways.
- Deal with EBB arguments.
Fix bugs in the reload pass exposed by the first test case:
- Create live ranges for temporary registers.
- Set encodings on created spill and fill instructions.
Add a spilling pass which lowers register pressure by assigning SSA
values to the stack. Important missing features:
- Resolve conflicts where an instruction uses the same value more than
once in incompatible ways.
- Deal with EBB arguments.
Fix bugs in the reload pass exposed by the first test case:
- Create live ranges for temporary registers.
- Set encodings on created spill and fill instructions.
The register pressure tracker now has to separate register counts: base
and transient.
The transient counts are used to track spikes of register pressure, such
as dead defs or temporary registers needed to satisfy instruction
constraints.
The base counts represent long-lived variables.
The register pressure tracker now has to separate register counts: base
and transient.
The transient counts are used to track spikes of register pressure, such
as dead defs or temporary registers needed to satisfy instruction
constraints.
The base counts represent long-lived variables.
Add a Stack() class for specifying operand constraints for values on the
stack.
Add encoding recipes for RISC-V spill and fill instructions. Don't
implement the encoding recipe functions yet since we don't have the
stack slot layout yet.
Add a Stack() class for specifying operand constraints for values on the
stack.
Add encoding recipes for RISC-V spill and fill instructions. Don't
implement the encoding recipe functions yet since we don't have the
stack slot layout yet.
This is now a generic function that can test arbitrary combinations of
instructions and EBBs for dominance.
It can handle anything that converts into an expanded program point,
including a ValueDef.
Also fix a bug if the earlier dominates() function which didn't properly
handle block layouts that were not topologically ordered.
This is now a generic function that can test arbitrary combinations of
instructions and EBBs for dominance.
It can handle anything that converts into an expanded program point,
including a ValueDef.
Also fix a bug if the earlier dominates() function which didn't properly
handle block layouts that were not topologically ordered.
When comparing instructions in the same EBB, behave like the RPO visits
instructions in program order.
- Add a Layout::pp_ebb() method for convenience. It gets the EBB
containing any program point.
- Add a conversion from ValueDef to ExpandedProgramPoint so it can be
used with the rpo_cmp method.
When comparing instructions in the same EBB, behave like the RPO visits
instructions in program order.
- Add a Layout::pp_ebb() method for convenience. It gets the EBB
containing any program point.
- Add a conversion from ValueDef to ExpandedProgramPoint so it can be
used with the rpo_cmp method.
