AbleOS/holey-bytes
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orginizing null checks better to get more peephole hits

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This commit is contained in:
Jakub Doka 2024-11-15 14:36:33 +01:00
parent 83146cfd61
commit afc1c5aac5
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GPG key ID: C6E9A89936B8C143
7 changed files with 132 additions and 152 deletions
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6
lang/README.md
View file

@ -957,10 +957,10 @@ main := fn(): int {
```hb
main := fn(): uint {
always_nn := @as(?^uint, &0)
ptr := @unwrap(always_nn)
ptr1 := @unwrap(always_nn)
always_n := @as(?^uint, null)
ptr = @unwrap(always_n)
return *ptr
ptr2 := @unwrap(always_n)
return *ptr1 + *ptr2
}
```

96
lang/src/son.rs
View file

@ -1362,8 +1362,36 @@ impl Nodes {
return Some(self[target].inputs[0]);
}
}
K::Die => {
if self[target].inputs[0] == NEVER {
return Some(NEVER);
}
}
K::Assert { kind, .. } => 'b: {
let pin = match (kind, self.try_match_cond(target)) {
(AssertKind::NullCheck, CondOptRes::Known { value: false, pin }) => pin,
(AssertKind::UnwrapCheck, CondOptRes::Unknown) => None,
_ => break 'b,
}
.unwrap_or(self[target].inputs[0]);
for out in self[target].outputs.clone() {
if !self[out].kind.is_pinned() && self[out].inputs[0] != pin {
self.modify_input(out, 0, pin);
}
}
return Some(self[target].inputs[2]);
}
_ if self.is_cfg(target) && self.idom(target) == NEVER => panic!(),
_ => {}
K::Start
| K::Entry
| K::Mem
| K::Loops
| K::End
| K::CInt { .. }
| K::Arg
| K::Global { .. }
| K::Join => {}
}
None
@ -1923,7 +1951,8 @@ impl Kind {
}
fn is_pinned(&self) -> bool {
self.is_cfg() || matches!(self, Self::Phi | Self::Arg | Self::Mem | Self::Loops)
self.is_cfg()
|| matches!(self, Self::Phi | Self::Arg | Self::Mem | Self::Loops | Kind::Assert { .. })
}
fn is_cfg(&self) -> bool {
@ -1937,7 +1966,6 @@ impl Kind {
| Self::Then
| Self::Else
| Self::Call { .. }
| Self::Assert { .. }
| Self::If
| Self::Region
| Self::Loop
@ -2257,9 +2285,7 @@ impl ItemCtx {
mem::take(&mut self.ctrl).soft_remove(&mut self.nodes);
self.nodes.iter_peeps(1000, stack, tys);
}
fn unlock(&mut self) {
self.nodes.unlock(MEM);
self.nodes.unlock(NEVER);
self.nodes.unlock(LOOPS);
@ -4383,7 +4409,7 @@ impl<'a> Codegen<'a> {
self.ci.finalize(&mut self.pool.nid_stack, self.tys, self.files);
let mut to_remove = vec![];
//let mut to_remove = vec![];
for (id, node) in self.ci.nodes.iter() {
let Kind::Assert { kind, pos } = node.kind else { continue };
@ -4408,49 +4434,10 @@ impl<'a> Codegen<'a> {
or explicitly check for null and handle it \
('if <opt> == null { /* handle */ } else { /* use opt */ }')"
}
(AK::NullCheck, CR::Known { value: false, pin }) => {
to_remove.push((id, pin));
continue;
}
(AK::UnwrapCheck, CR::Unknown) => {
to_remove.push((id, None));
continue;
}
_ => unreachable!(),
};
self.report(pos, msg);
}
to_remove.into_iter().for_each(|(n, pin)| {
let pin = pin.unwrap_or_else(|| {
let mut pin = self.ci.nodes[n].inputs[0];
while matches!(self.ci.nodes[pin].kind, Kind::Assert { .. }) {
pin = self.ci.nodes[n].inputs[0];
}
pin
});
for mut out in self.ci.nodes[n].outputs.clone() {
if self.ci.nodes.is_cfg(out) {
let index = self.ci.nodes[out].inputs.iter().position(|&p| p == n).unwrap();
self.ci.nodes.modify_input(out, index, self.ci.nodes[n].inputs[0]);
} else {
if !self.ci.nodes[out].kind.is_pinned() && self.ci.nodes[out].inputs[0] != pin {
out = self.ci.nodes.modify_input(out, 0, pin);
}
let index =
self.ci.nodes[out].inputs[1..].iter().position(|&p| p == n).unwrap() + 1;
self.ci.nodes.modify_input(out, index, self.ci.nodes[n].inputs[2]);
}
}
debug_assert!(
self.ci.nodes.values[n as usize]
.as_ref()
.map_or(true, |n| !matches!(n.kind, Kind::Assert { .. })),
"{:?} {:?}",
self.ci.nodes[n],
self.ci.nodes[n].outputs.iter().map(|&o| &self.ci.nodes[o]).collect::<Vec<_>>(),
);
});
self.ci.unlock();
for &node in self.ci.nodes[NEVER].inputs.iter() {
if self.ci.nodes[node].kind == Kind::Return
@ -4607,16 +4594,13 @@ impl<'a> Codegen<'a> {
self.unwrap_opt_unchecked(ty, oty, opt);
// TODO: extract the if check int a fucntion
self.ci.ctrl.set(
self.ci.nodes.new_node_nop(oty, Kind::Assert { kind, pos }, [
self.ci.ctrl.get(),
null_check,
opt.id,
]),
&mut self.ci.nodes,
);
self.ci.nodes.pass_aclass(self.ci.nodes.aclass_index(opt.id).1, self.ci.ctrl.get());
opt.id = self.ci.ctrl.get();
let ass = self.ci.nodes.new_node_nop(oty, Kind::Assert { kind, pos }, [
self.ci.ctrl.get(),
null_check,
opt.id,
]);
self.ci.nodes.pass_aclass(self.ci.nodes.aclass_index(opt.id).1, ass);
opt.id = ass;
}
fn unwrap_opt_unchecked(&mut self, ty: ty::Id, oty: ty::Id, opt: &mut Value) {

115
lang/tests/son_tests_inlining_issues.txt
View file

@ -27,8 +27,8 @@ main:
ADDI64 r254, r254, 90d
JALA r0, r31, 0a
put_filled_rect:
ADDI64 r254, r254, -212d
ST r32, r254, 108a, 104h
ADDI64 r254, r254, -220d
ST r32, r254, 108a, 112h
ST r3, r254, 92a, 16h
ADDI64 r3, r254, 92d
ST r5, r254, 76a, 16h
@ -36,74 +36,73 @@ put_filled_rect:
ST r7, r254, 75a, 1h
ADDI64 r7, r254, 75d
LI64 r8, 25d
LI64 r6, 2d
LI64 r9, 8d
ADDI64 r32, r254, 25d
ADDI64 r33, r254, 50d
LI8 r34, 5b
ST r34, r254, 25a, 1h
LD r35, r5, 0a, 8h
ST r35, r254, 26a, 4h
LI64 r36, 1d
ST r36, r254, 30a, 4h
LI64 r32, 2d
LI64 r6, 8d
ADDI64 r33, r254, 25d
ADDI64 r34, r254, 50d
LI8 r35, 5b
ST r35, r254, 25a, 1h
LD r36, r5, 0a, 8h
ST r36, r254, 26a, 4h
LI64 r37, 1d
ST r37, r254, 30a, 4h
ST r7, r254, 34a, 8h
ST r34, r254, 50a, 1h
ST r35, r254, 51a, 4h
ST r36, r254, 55a, 4h
ST r35, r254, 50a, 1h
ST r36, r254, 51a, 4h
ST r37, r254, 55a, 4h
ST r7, r254, 59a, 8h
CP r37, r7
LD r4, r3, 8a, 8h
LD r38, r5, 8a, 8h
ADD64 r1, r38, r4
SUB64 r5, r1, r36
LD r39, r2, 8a, 8h
MUL64 r7, r39, r5
CP r38, r7
LD r7, r3, 8a, 8h
LD r39, r5, 8a, 8h
ADD64 r11, r39, r7
SUB64 r4, r11, r37
LD r40, r2, 8a, 8h
MUL64 r5, r40, r4
LD r10, r2, 0a, 8h
ADD64 r11, r10, r7
LD r5, r3, 0a, 8h
ADD64 r40, r5, r11
MUL64 r4, r39, r4
ADD64 r7, r10, r4
ADD64 r41, r5, r7
3: JGTU r38, r36, :0
JNE r38, r36, :1
ADD64 r9, r10, r5
LD r41, r3, 0a, 8h
ADD64 r42, r41, r9
MUL64 r43, r40, r7
3: ADD64 r43, r43, r10
ADD64 r9, r43, r41
JGTU r39, r37, :0
JNE r39, r37, :1
ADDI64 r4, r254, 0d
ST r34, r254, 0a, 1h
ST r35, r254, 1a, 4h
ST r36, r254, 5a, 4h
ST r37, r254, 9a, 8h
ST r41, r254, 17a, 8h
CP r2, r9
CP r3, r6
ST r35, r254, 0a, 1h
ST r36, r254, 1a, 4h
ST r37, r254, 5a, 4h
ST r38, r254, 9a, 8h
ST r9, r254, 17a, 8h
CP r2, r6
CP r3, r32
CP r5, r8
ECA
JMP :1
1: JMP :2
0: CP r3, r6
CP r42, r9
CP r43, r8
ST r41, r254, 67a, 8h
CP r44, r3
CP r2, r42
0: CP r3, r32
CP r44, r6
CP r45, r8
ST r9, r254, 67a, 8h
CP r2, r44
CP r4, r34
CP r5, r45
ECA
ST r42, r254, 42a, 8h
CP r2, r44
CP r3, r32
CP r4, r33
CP r5, r43
CP r5, r45
ECA
ST r40, r254, 42a, 8h
CP r2, r42
CP r3, r44
CP r4, r32
CP r5, r43
ECA
SUB64 r40, r40, r39
ADD64 r41, r39, r41
SUB64 r38, r38, r44
SUB64 r42, r42, r40
SUB64 r39, r39, r32
CP r10, r41
CP r41, r40
CP r8, r45
CP r6, r44
CP r8, r43
CP r9, r42
JMP :3
2: LD r32, r254, 108a, 104h
ADDI64 r254, r254, 212d
2: LD r32, r254, 108a, 112h
ADDI64 r254, r254, 220d
JALA r0, r31, 0a
code size: 910
code size: 906
ret: 0
status: Ok(())

12
lang/tests/son_tests_needless_unwrap.txt
View file

@ -1,6 +1,6 @@
test.hb:4:17: unwrap is not needed since the value is (provably) never null, remove it, or replace with '@as(<expr_ty>, <opt_expr>)'
ptr := @unwrap(always_nn)
^
test.hb:6:16: unwrap is incorrect since the value is (provably) always null, make sure your logic is correct
ptr = @unwrap(always_n)
^
test.hb:4:18: unwrap is not needed since the value is (provably) never null, remove it, or replace with '@as(<expr_ty>, <opt_expr>)'
ptr1 := @unwrap(always_nn)
^
test.hb:6:18: unwrap is incorrect since the value is (provably) always null, make sure your logic is correct
ptr2 := @unwrap(always_n)
^

30
lang/tests/son_tests_null_check_returning_small_global.txt
View file

@ -1,6 +1,6 @@
foo:
ADDI64 r254, r254, -184d
ST r31, r254, 80a, 104h
ADDI64 r254, r254, -176d
ST r31, r254, 80a, 96h
ADDI64 r32, r254, 64d
LRA r3, r0, :some_file
JAL r31, r0, :get
@ -17,25 +17,25 @@ foo:
LI64 r36, 4d
LD r37, r254, 72a, 8h
JNE r37, r36, :2
ADDI64 r38, r254, 32d
ADDI64 r37, r254, 32d
ST r35, r254, 32a, 1h
LI64 r39, 2d
ST r39, r254, 40a, 8h
LD r1, r38, 0a, 16h
LI64 r38, 2d
ST r38, r254, 40a, 8h
LD r1, r37, 0a, 16h
JMP :1
2: LRA r40, r0, :MAGIC
LD r41, r40, 0a, 8h
JNE r41, r37, :3
ADDI64 r42, r254, 16d
2: LRA r39, r0, :MAGIC
LD r40, r39, 0a, 8h
JNE r40, r37, :3
ADDI64 r41, r254, 16d
ST r35, r254, 16a, 1h
ST r0, r254, 24a, 8h
LD r1, r42, 0a, 16h
LD r1, r41, 0a, 16h
JMP :1
3: ADDI64 r43, r254, 0d
3: ADDI64 r42, r254, 0d
ST r0, r254, 0a, 1h
LD r1, r43, 0a, 16h
1: LD r31, r254, 80a, 104h
ADDI64 r254, r254, 184d
LD r1, r42, 0a, 16h
1: LD r31, r254, 80a, 96h
ADDI64 r254, r254, 176d
JALA r0, r31, 0a
get:
ADDI64 r254, r254, -32d

11
lang/tests/son_tests_request_page.txt
View file

@ -9,9 +9,9 @@ create_back_buffer:
LI8 r34, 255b
CP r2, r34
JAL r31, r0, :request_page
CP r2, r33
SUB64 r35, r2, r32
5: JGTS r35, r0, :2
CP r35, r33
5: SUB64 r35, r35, r32
JGTS r35, r0, :2
JMP :1
2: CP r36, r1
JLTS r35, r32, :3
@ -20,8 +20,7 @@ create_back_buffer:
JMP :4
3: CP r2, r35
JAL r31, r0, :request_page
4: SUB64 r35, r35, r32
CP r1, r36
4: CP r1, r36
JMP :5
1: LD r31, r254, 0a, 48h
ADDI64 r254, r254, 48d
@ -42,6 +41,6 @@ request_page:
LI64 r2, 3d
ECA
JALA r0, r31, 0a
code size: 321
code size: 317
ret: 42
status: Ok(())

14
lang/tests/son_tests_storing_into_nullable_struct.txt
View file

@ -4,8 +4,8 @@ do_stuff:
just_read:
JALA r0, r31, 0a
main:
ADDI64 r254, r254, -104d
ST r31, r254, 48a, 56h
ADDI64 r254, r254, -96d
ST r31, r254, 48a, 48h
ADDI64 r32, r254, 16d
CP r1, r32
JAL r31, r0, :optionala
@ -28,13 +28,11 @@ main:
JNE r36, r0, :2
LI64 r1, 20d
JMP :1
2: LI64 r37, 100d
ST r37, r254, 8a, 8h
LD r2, r254, 8a, 8h
2: LI64 r2, 100d
JAL r31, r0, :do_stuff
ADD64 r1, r1, r34
1: LD r31, r254, 48a, 56h
ADDI64 r254, r254, 104d
1: LD r31, r254, 48a, 48h
ADDI64 r254, r254, 96d
JALA r0, r31, 0a
optional:
ADDI64 r254, r254, -16d
@ -61,6 +59,6 @@ optionala:
BMC r6, r1, 32h
ADDI64 r254, r254, 48d
JALA r0, r31, 0a
code size: 580
code size: 554
ret: 100
status: Ok(())