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x64: Implement rotl and rotr for small integers

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This commit is contained in:
bjorn3
2020-08-23 10:49:44 +02:00
committed by Benjamin Bouvier
parent 4251a950ba
commit 067255ef45
4 changed files with 105 additions and 78 deletions
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21
cranelift/codegen/src/isa/x64/inst/mod.rs
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@@ -166,9 +166,9 @@ pub enum Inst {
srcloc: Option<SourceLoc>,
},
/// Arithmetic shifts: (shl shr sar) (l q) imm reg.
/// Arithmetic shifts: (shl shr sar) (b w l q) imm reg.
Shift_R {
is_64: bool,
size: u8, // 1, 2, 4 or 8
kind: ShiftKind,
/// shift count: Some(0 .. #bits-in-type - 1), or None to mean "%cl".
num_bits: Option<u8>,
@@ -892,19 +892,20 @@ impl Inst {
}
pub(crate) fn shift_r(
is_64: bool,
size: u8,
kind: ShiftKind,
num_bits: Option<u8>,
dst: Writable<Reg>,
) -> Inst {
debug_assert!(size == 8 || size == 4 || size == 2 || size == 1);
debug_assert!(if let Some(num_bits) = num_bits {
num_bits < if is_64 { 64 } else { 32 }
num_bits < size * 8
} else {
true
});
debug_assert!(dst.to_reg().get_class() == RegClass::I64);
Inst::Shift_R {
is_64,
size,
kind,
num_bits,
dst,
@@ -1511,22 +1512,22 @@ impl ShowWithRRU for Inst {
),
Inst::Shift_R {
is_64,
size,
kind,
num_bits,
dst,
} => match num_bits {
None => format!(
"{} %cl, {}",
ljustify2(kind.to_string(), suffixLQ(*is_64)),
show_ireg_sized(dst.to_reg(), mb_rru, sizeLQ(*is_64))
ljustify2(kind.to_string(), suffixBWLQ(*size)),
show_ireg_sized(dst.to_reg(), mb_rru, *size)
),
Some(num_bits) => format!(
"{} ${}, {}",
ljustify2(kind.to_string(), suffixLQ(*is_64)),
ljustify2(kind.to_string(), suffixBWLQ(*size)),
num_bits,
show_ireg_sized(dst.to_reg(), mb_rru, sizeLQ(*is_64))
show_ireg_sized(dst.to_reg(), mb_rru, *size)
),
},