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machinst x64: add support for umulhi/smulhi;

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This commit is contained in:
Benjamin Bouvier
2020-07-03 16:15:27 +02:00
parent 571061fe4c
commit eda2d143ed
4 changed files with 98 additions and 0 deletions
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26
cranelift/codegen/src/isa/x64/inst/mod.rs
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@@ -57,6 +57,9 @@ pub enum Inst {
loc: SourceLoc,
},
/// The high result of a (un)signed multiply: imul/mul using RAX:RDX.
MulHi { size: u8, signed: bool, rhs: RegMem },
/// A synthetic sequence to implement the right inline checks for remainder and division,
/// assuming the dividend is in $rax.
/// Puts the result back into $rax if is_div, $rdx if !is_div, to mimic what the div
@@ -301,6 +304,12 @@ impl Inst {
loc,
}
}
pub(crate) fn mul_hi(size: u8, signed: bool, rhs: RegMem) -> Inst {
debug_assert!(size == 8 || size == 4 || size == 2 || size == 1);
Inst::MulHi { size, signed, rhs }
}
pub(crate) fn sign_extend_rax_to_rdx(size: u8) -> Inst {
debug_assert!(size == 8 || size == 4 || size == 2);
Inst::SignExtendRaxRdx { size }
@@ -581,6 +590,17 @@ impl ShowWithRRU for Inst {
}),
divisor.show_rru_sized(mb_rru, *size)
),
Inst::MulHi {
size, signed, rhs, ..
} => format!(
"{} {}",
ljustify(if *signed {
"imul".to_string()
} else {
"mul".to_string()
}),
rhs.show_rru_sized(mb_rru, *size)
),
Inst::CheckedDivOrRemSeq {
is_div,
is_signed,
@@ -796,6 +816,11 @@ fn x64_get_regs(inst: &Inst, collector: &mut RegUsageCollector) {
collector.add_mod(Writable::from_reg(regs::rdx()));
divisor.get_regs_as_uses(collector);
}
Inst::MulHi { rhs, .. } => {
collector.add_mod(Writable::from_reg(regs::rax()));
collector.add_def(Writable::from_reg(regs::rdx()));
rhs.get_regs_as_uses(collector);
}
Inst::CheckedDivOrRemSeq { divisor, .. } => {
collector.add_mod(Writable::from_reg(regs::rax()));
collector.add_mod(Writable::from_reg(regs::rdx()));
@@ -994,6 +1019,7 @@ fn x64_map_regs<RUM: RegUsageMapper>(inst: &mut Inst, mapper: &RUM) {
map_mod(mapper, dst);
}
Inst::Div { divisor, .. } => divisor.map_uses(mapper),
Inst::MulHi { rhs, .. } => rhs.map_uses(mapper),
Inst::CheckedDivOrRemSeq { divisor, .. } => {
map_use(mapper, divisor);
}