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machinst x64: implement cmov

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This commit is contained in:
Benjamin Bouvier
2020-06-25 19:30:11 +02:00
parent bd88065571
commit 9d1bcfb2e8
5 changed files with 160 additions and 29 deletions
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34
cranelift/codegen/src/isa/x64/inst/mod.rs
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@@ -118,6 +118,16 @@ pub enum Inst {
/// Materializes the requested condition code in the destination reg.
Setcc { cc: CC, dst: Writable<Reg> },
/// Integer conditional move.
/// Overwrites the destination register.
Cmove {
/// Possible values are 2, 4 or 8. Checked in the related factory.
size: u8,
cc: CC,
src: RegMem,
dst: Writable<Reg>,
},
// =====================================
// Stack manipulation.
/// pushq (reg addr imm)
@@ -350,6 +360,12 @@ impl Inst {
Inst::Setcc { cc, dst }
}
pub(crate) fn cmove(size: u8, cc: CC, src: RegMem, dst: Writable<Reg>) -> Inst {
debug_assert!(size == 8 || size == 4 || size == 2);
debug_assert!(dst.to_reg().get_class() == RegClass::I64);
Inst::Cmove { size, cc, src, dst }
}
pub(crate) fn push64(src: RegMemImm) -> Inst {
Inst::Push64 { src }
}
@@ -585,6 +601,12 @@ impl ShowWithRRU for Inst {
ljustify2("set".to_string(), cc.to_string()),
show_ireg_sized(dst.to_reg(), mb_rru, 1)
),
Inst::Cmove { size, cc, src, dst } => format!(
"{} {}, {}",
ljustify(format!("cmov{}{}", cc.to_string(), suffixBWLQ(*size))),
src.show_rru_sized(mb_rru, *size),
show_ireg_sized(dst.to_reg(), mb_rru, *size)
),
Inst::Push64 { src } => {
format!("{} {}", ljustify("pushq".to_string()), src.show_rru(mb_rru))
}
@@ -701,6 +723,10 @@ fn x64_get_regs(inst: &Inst, collector: &mut RegUsageCollector) {
Inst::Setcc { dst, .. } => {
collector.add_def(*dst);
}
Inst::Cmove { src, dst, .. } => {
src.get_regs_as_uses(collector);
collector.add_def(*dst);
}
Inst::Push64 { src } => {
src.get_regs_as_uses(collector);
collector.add_mod(Writable::from_reg(regs::rsp()));
@@ -899,6 +925,14 @@ fn x64_map_regs<RUM: RegUsageMapper>(inst: &mut Inst, mapper: &RUM) {
map_use(mapper, dst);
}
Inst::Setcc { ref mut dst, .. } => map_def(mapper, dst),
Inst::Cmove {
ref mut src,
ref mut dst,
..
} => {
src.map_uses(mapper);
map_def(mapper, dst)
}
Inst::Push64 { ref mut src } => src.map_uses(mapper),
Inst::Pop64 { ref mut dst } => {
map_def(mapper, dst);