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x64: refactor the representation of *Mem and *MemImm #10775

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x64: refactor the representation of *Mem and *MemImm #10775

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33 changes: 27 additions & 6 deletions cranelift/codegen/src/isa/x64/inst.isle
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Original file line number Diff line number Diff line change
Expand Up @@ -1553,17 +1553,38 @@
(type Gpr (primitive Gpr))
(type WritableGpr (primitive WritableGpr))
(type OptionWritableGpr (primitive OptionWritableGpr))
(type GprMem extern (enum))
(type GprMemImm extern (enum))
(type GprMem extern
(enum
(Reg (reg Reg))
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@abrown abrown May 14, 2025 •
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Is it now theoretically possible to create a GprMem.Reg in ISLE using the wrong kind of register? If so, we could alter this type to Gpr?

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Would it be possible to type this as (Gpr (reg Gpr))? That more closely matches the semantics of the GprMem constructor in Rust

(Mem (addr SyntheticAmode))))
(type GprMemImm extern
(enum
(Reg (reg Reg))
(Mem (addr SyntheticAmode))
(Imm (simm32 u32))))
(type Imm8Gpr extern (enum))

(type Xmm (primitive Xmm))
(type WritableXmm (primitive WritableXmm))
(type OptionWritableXmm (primitive OptionWritableXmm))
(type XmmMem extern (enum))
(type XmmMemAligned extern (enum))
(type XmmMemImm extern (enum))
(type XmmMemAlignedImm extern (enum))
(type XmmMem extern
(enum
(Reg (reg Reg))
(Mem (addr SyntheticAmode))))
(type XmmMemAligned extern
(enum
(Reg (reg Reg))
(Mem (addr SyntheticAmode))))
(type XmmMemImm extern
(enum
(Reg (reg Reg))
(Mem (addr SyntheticAmode))
(Imm (simm32 u32))))
(type XmmMemAlignedImm extern
(enum
(Reg (reg Reg))
(Mem (addr SyntheticAmode))
(Imm (simm32 u32))))

;; Convert an `Imm8Reg` into an `Imm8Gpr`.
(decl imm8_reg_to_imm8_gpr (Imm8Reg) Imm8Gpr)
Expand Down
97 changes: 55 additions & 42 deletions cranelift/codegen/src/isa/x64/inst/args.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -128,31 +128,34 @@ macro_rules! newtype_of_reg {
}

$(
/// A newtype wrapper around `RegMem` for general-purpose registers.
/// A newtype wrapper around `RegMem`; these variants should match
/// the `RegMem` variants exactly.
#[derive(Clone, Debug)]
pub struct $newtype_reg_mem(RegMem);
#[expect(missing_docs, reason = "see `RegMem`")]
pub enum $newtype_reg_mem {
Reg { reg: Reg },
Mem { addr: SyntheticAmode },
}

impl From<$newtype_reg_mem> for RegMem {
fn from(rm: $newtype_reg_mem) -> Self {
rm.0
}
}
impl<'a> From<&'a $newtype_reg_mem> for &'a RegMem {
fn from(rm: &'a $newtype_reg_mem) -> &'a RegMem {
&rm.0
match rm {
$newtype_reg_mem::Reg { reg } => RegMem::Reg { reg },
$newtype_reg_mem::Mem { addr } => RegMem::Mem { addr },
}
}
}

impl From<$newtype_reg> for $newtype_reg_mem {
fn from(r: $newtype_reg) -> Self {
$newtype_reg_mem(RegMem::reg(r.into()))
$newtype_reg_mem::Reg { reg: r.into() }
}
}

impl $newtype_reg_mem {
/// Construct a `RegMem` newtype from the given `RegMem`, or return
/// `None` if the `RegMem` is not a valid instance of this `RegMem`
/// newtype.
/// Construct a `RegMem` newtype from the given `RegMem`, or
/// return `None` if the `RegMem` is not a valid instance of
/// this `RegMem` newtype.
pub fn new(rm: RegMem) -> Option<Self> {
match rm {
RegMem::Mem { addr } => {
Expand All @@ -163,7 +166,7 @@ macro_rules! newtype_of_reg {
}
)?
if _allow {
Some(Self(RegMem::Mem { addr }))
Some(Self::Mem { addr })
} else {
None
}
Expand All @@ -185,48 +188,59 @@ macro_rules! newtype_of_reg {
);
}
)?
Self(RegMem::Mem { addr })
Self::Mem { addr }
}
RegMem::Reg { reg } => $newtype_reg::unwrap_new(reg).into(),
}
}

/// Convert this newtype into its underlying `RegMem`.
pub fn to_reg_mem(self) -> RegMem {
self.0
self.into()
}

#[allow(dead_code)] // Used by some newtypes and not others.
pub(crate) fn get_operands(&mut self, collector: &mut impl OperandVisitor) {
self.0.get_operands(collector);
match self {
Self::Reg { reg } => collector.reg_use(reg),
Self::Mem { addr } => addr.get_operands(collector),
}
}
}
impl PrettyPrint for $newtype_reg_mem {
fn pretty_print(&self, size: u8) -> String {
self.0.pretty_print(size)
match self {
Self::Reg { reg } => pretty_print_reg(*reg, size),
Self::Mem { addr } => addr.pretty_print(size),
}
}
}
)*

$(
/// A newtype wrapper around `RegMemImm`.
/// A newtype wrapper imitating `RegMemImm`; these variants should
/// match the `RegMemImm` variants exactly.
#[derive(Clone, Debug)]
pub struct $newtype_reg_mem_imm(RegMemImm);
#[expect(missing_docs, reason = "see `RegMemImm`")]
pub enum $newtype_reg_mem_imm {
Reg { reg: Reg },
Mem { addr: SyntheticAmode },
Imm { simm32: u32 },
}

impl From<$newtype_reg_mem_imm> for RegMemImm {
fn from(rmi: $newtype_reg_mem_imm) -> RegMemImm {
rmi.0
}
}
impl<'a> From<&'a $newtype_reg_mem_imm> for &'a RegMemImm {
fn from(rmi: &'a $newtype_reg_mem_imm) -> &'a RegMemImm {
&rmi.0
match rmi {
$newtype_reg_mem_imm::Reg { reg } => RegMemImm::Reg { reg },
$newtype_reg_mem_imm::Mem { addr } => RegMemImm::Mem { addr },
$newtype_reg_mem_imm::Imm { simm32 } => RegMemImm::Imm { simm32 },
}
}
}

impl From<$newtype_reg> for $newtype_reg_mem_imm {
fn from(r: $newtype_reg) -> Self {
$newtype_reg_mem_imm(RegMemImm::reg(r.into()))
$newtype_reg_mem_imm::Reg { reg: r.into() }
}
}

Expand All @@ -236,7 +250,7 @@ macro_rules! newtype_of_reg {
/// newtype.
pub fn new(rmi: RegMemImm) -> Option<Self> {
match rmi {
RegMemImm::Imm { .. } => Some(Self(rmi)),
RegMemImm::Imm { simm32 } => Some(Self::Imm { simm32 }),
RegMemImm::Mem { addr } => {
let mut _allow = true;
$(
Expand All @@ -245,7 +259,7 @@ macro_rules! newtype_of_reg {
}
)?
if _allow {
Some(Self(RegMemImm::Mem { addr }))
Some(Self::Mem { addr })
} else {
None
}
Expand All @@ -258,7 +272,7 @@ macro_rules! newtype_of_reg {
/// messages in case of failure.
pub fn unwrap_new(rmi: RegMemImm) -> Self {
match rmi {
RegMemImm::Imm { .. } => Self(rmi),
RegMemImm::Imm { simm32 } => Self::Imm { simm32 },
RegMemImm::Mem { addr } => {
$(
if $aligned_imm && !addr.aligned() {
Expand All @@ -269,7 +283,7 @@ macro_rules! newtype_of_reg {
);
}
)?
Self(RegMemImm::Mem { addr })
Self::Mem { addr }

}
RegMemImm::Reg { reg } => $newtype_reg::unwrap_new(reg).into(),
Expand All @@ -279,18 +293,26 @@ macro_rules! newtype_of_reg {
/// Convert this newtype into its underlying `RegMemImm`.
#[allow(dead_code)] // Used by some newtypes and not others.
pub fn to_reg_mem_imm(self) -> RegMemImm {
self.0
self.into()
}

#[allow(dead_code)] // Used by some newtypes and not others.
pub(crate) fn get_operands(&mut self, collector: &mut impl OperandVisitor) {
self.0.get_operands(collector);
match self {
Self::Reg { reg } => collector.reg_use(reg),
Self::Mem { addr } => addr.get_operands(collector),
Self::Imm { .. } => {}
}
}
}

impl PrettyPrint for $newtype_reg_mem_imm {
fn pretty_print(&self, size: u8) -> String {
self.0.pretty_print(size)
match self {
Self::Reg { reg } => pretty_print_reg(*reg, size),
Self::Mem { addr } => addr.pretty_print(size),
Self::Imm { simm32 } => format!("${}", *simm32 as i32),
}
}
}
)*
Expand Down Expand Up @@ -679,15 +701,6 @@ impl RegMemImm {
debug_assert_eq!(reg.class(), expected_reg_class);
}
}

/// Add the regs mentioned by `self` to `collector`.
pub(crate) fn get_operands(&mut self, collector: &mut impl OperandVisitor) {
match self {
Self::Reg { reg } => collector.reg_use(reg),
Self::Mem { addr } => addr.get_operands(collector),
Self::Imm { .. } => {}
}
}
}

impl From<RegMem> for RegMemImm {
Expand Down
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