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machinst x64: optimize select/brz/brnz when the input is a comparison;

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This commit is contained in:
Benjamin Bouvier
2020-08-18 16:30:47 +02:00
parent 620e4b4e82
commit cca10b87cb
4 changed files with 257 additions and 34 deletions
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10
cranelift/codegen/src/isa/x64/inst/args.rs
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@@ -849,7 +849,7 @@ impl CC {
FloatCC::Ordered => CC::NP,
FloatCC::Unordered => CC::P,
// Alias for NE
FloatCC::NotEqual | FloatCC::OrderedNotEqual => CC::NZ,
FloatCC::OrderedNotEqual => CC::NZ,
// Alias for E
FloatCC::UnorderedOrEqual => CC::Z,
// Alias for A
@@ -859,12 +859,14 @@ impl CC {
FloatCC::UnorderedOrLessThan => CC::B,
FloatCC::UnorderedOrLessThanOrEqual => CC::BE,
FloatCC::Equal
| FloatCC::NotEqual
| FloatCC::LessThan
| FloatCC::LessThanOrEqual
| FloatCC::UnorderedOrGreaterThan
| FloatCC::UnorderedOrGreaterThanOrEqual => {
panic!("No single condition code to guarantee ordered. Treat as special case.")
}
| FloatCC::UnorderedOrGreaterThanOrEqual => panic!(
"{:?} can't be lowered to a CC code; treat as special case.",
floatcc
),
}
}