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Add support for fixed stack slots

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This works by allowing a PReg to be marked as being a stack location
instead of a physical register.
This commit is contained in:
Amanieu d'Antras
2021-11-28 17:52:50 +00:00
parent 2f433929c4
commit 77e6a9e0d7
8 changed files with 54 additions and 25 deletions
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18
src/ion/moves.rs
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@@ -35,6 +35,16 @@ impl<'a, F: Function> Env<'a, F> {
pos == self.cfginfo.block_exit[block.index()]
}
fn allocation_is_stack(&self, alloc: Allocation) -> bool {
if alloc.is_stack() {
true
} else if let Some(preg) = alloc.as_reg() {
self.pregs[preg.index()].is_stack
} else {
false
}
}
pub fn insert_move(
&mut self,
pos: ProgPoint,
@@ -968,9 +978,9 @@ impl<'a, F: Function> Env<'a, F> {
let scratch_used = resolved.iter().any(|&(src, dst, _)| {
src == Allocation::reg(scratch) || dst == Allocation::reg(scratch)
});
let stack_stack_move = resolved
.iter()
.any(|&(src, dst, _)| src.is_stack() && dst.is_stack());
let stack_stack_move = resolved.iter().any(|&(src, dst, _)| {
self.allocation_is_stack(src) && self.allocation_is_stack(dst)
});
let extra_slot = if scratch_used && stack_stack_move {
if self.extra_spillslot[regclass as u8 as usize].is_none() {
let slot = self.allocate_spillslot(regclass);
@@ -989,7 +999,7 @@ impl<'a, F: Function> Env<'a, F> {
if dst == Allocation::reg(scratch) {
scratch_used_yet = true;
}
if src.is_stack() && dst.is_stack() {
if self.allocation_is_stack(src) && self.allocation_is_stack(dst) {
if !scratch_used_yet {
self.add_edit(
pos,