Add float comparison operators to Winch #7379
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jeffcharles
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alexcrichton
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alexcrichton
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saulecabrera
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saulecabrera
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Oct 26, 2023
winch/codegen/src/isa/x64/masm.rs
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| let (src1, src2, set_kind) = match kind { | ||
| FloatCmpKind::Eq => (src1, src2, IntCmpKind::Eq), | ||
| FloatCmpKind::Ne => (src1, src2, IntCmpKind::Ne), | ||
| FloatCmpKind::Lt => (src2, src1, IntCmpKind::GtU), | ||
| FloatCmpKind::Le => (src2, src1, IntCmpKind::GeU), | ||
| FloatCmpKind::Gt => (src2, src1, IntCmpKind::LtU), | ||
| FloatCmpKind::Ge => (src2, src1, IntCmpKind::LeU), | ||
| }; |
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Can we add a comment here explaining why we use the comp kind complement? (e.g. Ge => LeU)
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Yeah that's fair. I realized when writing the comments that we only need to perform the complementary comparisons for lt and le given we need to have the PF checks for gt and ge so we're not saving any instructions by swapping those so we no longer swap those.
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Part of #6528. Adds support for the
f32.eq,f64.eq,f32.ne,f64.ne,f32.lt,f64.lt,f32.gt,f64.gt,f32.le,f64.le,f32.ge, andf64.geoperators to Winch.Also renames the macroassembler
CmpKindenum toIntCmpKinddue to the introduction of aFloatCmpKindenum.