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cmd/compile: convert CCop arm64 rules to typed aux
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  GOARCH=arm64 gotip build -toolexec 'toolstash -cmp' -a std

Change-Id: Id88141dfc0dfb02c3e958e48ab4adfbac7ba1380
Reviewed-on: https://go-review.googlesource.com/c/go/+/230837
Run-TryBot: Alberto Donizetti <alb.donizetti@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
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ALTree committed Apr 29, 2020
1 parent f2163c4 commit c8b42f9
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Showing 4 changed files with 215 additions and 209 deletions.
124 changes: 62 additions & 62 deletions src/cmd/compile/internal/ssa/gen/ARM64.rules
Original file line number Diff line number Diff line change
Expand Up @@ -132,65 +132,65 @@
// we compare to 64 to ensure Go semantics for large shifts
// Rules about rotates with non-const shift are based on the following rules,
// if the following rules change, please also modify the rules based on them.
(Lsh64x64 <t> x y) -> (CSEL {OpARM64LessThanU} (SLL <t> x y) (Const64 <t> [0]) (CMPconst [64] y))
(Lsh64x32 <t> x y) -> (CSEL {OpARM64LessThanU} (SLL <t> x (ZeroExt32to64 y)) (Const64 <t> [0]) (CMPconst [64] (ZeroExt32to64 y)))
(Lsh64x16 <t> x y) -> (CSEL {OpARM64LessThanU} (SLL <t> x (ZeroExt16to64 y)) (Const64 <t> [0]) (CMPconst [64] (ZeroExt16to64 y)))
(Lsh64x8 <t> x y) -> (CSEL {OpARM64LessThanU} (SLL <t> x (ZeroExt8to64 y)) (Const64 <t> [0]) (CMPconst [64] (ZeroExt8to64 y)))

(Lsh32x64 <t> x y) -> (CSEL {OpARM64LessThanU} (SLL <t> x y) (Const64 <t> [0]) (CMPconst [64] y))
(Lsh32x32 <t> x y) -> (CSEL {OpARM64LessThanU} (SLL <t> x (ZeroExt32to64 y)) (Const64 <t> [0]) (CMPconst [64] (ZeroExt32to64 y)))
(Lsh32x16 <t> x y) -> (CSEL {OpARM64LessThanU} (SLL <t> x (ZeroExt16to64 y)) (Const64 <t> [0]) (CMPconst [64] (ZeroExt16to64 y)))
(Lsh32x8 <t> x y) -> (CSEL {OpARM64LessThanU} (SLL <t> x (ZeroExt8to64 y)) (Const64 <t> [0]) (CMPconst [64] (ZeroExt8to64 y)))

(Lsh16x64 <t> x y) -> (CSEL {OpARM64LessThanU} (SLL <t> x y) (Const64 <t> [0]) (CMPconst [64] y))
(Lsh16x32 <t> x y) -> (CSEL {OpARM64LessThanU} (SLL <t> x (ZeroExt32to64 y)) (Const64 <t> [0]) (CMPconst [64] (ZeroExt32to64 y)))
(Lsh16x16 <t> x y) -> (CSEL {OpARM64LessThanU} (SLL <t> x (ZeroExt16to64 y)) (Const64 <t> [0]) (CMPconst [64] (ZeroExt16to64 y)))
(Lsh16x8 <t> x y) -> (CSEL {OpARM64LessThanU} (SLL <t> x (ZeroExt8to64 y)) (Const64 <t> [0]) (CMPconst [64] (ZeroExt8to64 y)))

(Lsh8x64 <t> x y) -> (CSEL {OpARM64LessThanU} (SLL <t> x y) (Const64 <t> [0]) (CMPconst [64] y))
(Lsh8x32 <t> x y) -> (CSEL {OpARM64LessThanU} (SLL <t> x (ZeroExt32to64 y)) (Const64 <t> [0]) (CMPconst [64] (ZeroExt32to64 y)))
(Lsh8x16 <t> x y) -> (CSEL {OpARM64LessThanU} (SLL <t> x (ZeroExt16to64 y)) (Const64 <t> [0]) (CMPconst [64] (ZeroExt16to64 y)))
(Lsh8x8 <t> x y) -> (CSEL {OpARM64LessThanU} (SLL <t> x (ZeroExt8to64 y)) (Const64 <t> [0]) (CMPconst [64] (ZeroExt8to64 y)))

(Rsh64Ux64 <t> x y) -> (CSEL {OpARM64LessThanU} (SRL <t> x y) (Const64 <t> [0]) (CMPconst [64] y))
(Rsh64Ux32 <t> x y) -> (CSEL {OpARM64LessThanU} (SRL <t> x (ZeroExt32to64 y)) (Const64 <t> [0]) (CMPconst [64] (ZeroExt32to64 y)))
(Rsh64Ux16 <t> x y) -> (CSEL {OpARM64LessThanU} (SRL <t> x (ZeroExt16to64 y)) (Const64 <t> [0]) (CMPconst [64] (ZeroExt16to64 y)))
(Rsh64Ux8 <t> x y) -> (CSEL {OpARM64LessThanU} (SRL <t> x (ZeroExt8to64 y)) (Const64 <t> [0]) (CMPconst [64] (ZeroExt8to64 y)))

(Rsh32Ux64 <t> x y) -> (CSEL {OpARM64LessThanU} (SRL <t> (ZeroExt32to64 x) y) (Const64 <t> [0]) (CMPconst [64] y))
(Rsh32Ux32 <t> x y) -> (CSEL {OpARM64LessThanU} (SRL <t> (ZeroExt32to64 x) (ZeroExt32to64 y)) (Const64 <t> [0]) (CMPconst [64] (ZeroExt32to64 y)))
(Rsh32Ux16 <t> x y) -> (CSEL {OpARM64LessThanU} (SRL <t> (ZeroExt32to64 x) (ZeroExt16to64 y)) (Const64 <t> [0]) (CMPconst [64] (ZeroExt16to64 y)))
(Rsh32Ux8 <t> x y) -> (CSEL {OpARM64LessThanU} (SRL <t> (ZeroExt32to64 x) (ZeroExt8to64 y)) (Const64 <t> [0]) (CMPconst [64] (ZeroExt8to64 y)))

(Rsh16Ux64 <t> x y) -> (CSEL {OpARM64LessThanU} (SRL <t> (ZeroExt16to64 x) y) (Const64 <t> [0]) (CMPconst [64] y))
(Rsh16Ux32 <t> x y) -> (CSEL {OpARM64LessThanU} (SRL <t> (ZeroExt16to64 x) (ZeroExt32to64 y)) (Const64 <t> [0]) (CMPconst [64] (ZeroExt32to64 y)))
(Rsh16Ux16 <t> x y) -> (CSEL {OpARM64LessThanU} (SRL <t> (ZeroExt16to64 x) (ZeroExt16to64 y)) (Const64 <t> [0]) (CMPconst [64] (ZeroExt16to64 y)))
(Rsh16Ux8 <t> x y) -> (CSEL {OpARM64LessThanU} (SRL <t> (ZeroExt16to64 x) (ZeroExt8to64 y)) (Const64 <t> [0]) (CMPconst [64] (ZeroExt8to64 y)))

(Rsh8Ux64 <t> x y) -> (CSEL {OpARM64LessThanU} (SRL <t> (ZeroExt8to64 x) y) (Const64 <t> [0]) (CMPconst [64] y))
(Rsh8Ux32 <t> x y) -> (CSEL {OpARM64LessThanU} (SRL <t> (ZeroExt8to64 x) (ZeroExt32to64 y)) (Const64 <t> [0]) (CMPconst [64] (ZeroExt32to64 y)))
(Rsh8Ux16 <t> x y) -> (CSEL {OpARM64LessThanU} (SRL <t> (ZeroExt8to64 x) (ZeroExt16to64 y)) (Const64 <t> [0]) (CMPconst [64] (ZeroExt16to64 y)))
(Rsh8Ux8 <t> x y) -> (CSEL {OpARM64LessThanU} (SRL <t> (ZeroExt8to64 x) (ZeroExt8to64 y)) (Const64 <t> [0]) (CMPconst [64] (ZeroExt8to64 y)))

(Rsh64x64 x y) -> (SRA x (CSEL {OpARM64LessThanU} <y.Type> y (Const64 <y.Type> [63]) (CMPconst [64] y)))
(Rsh64x32 x y) -> (SRA x (CSEL {OpARM64LessThanU} <y.Type> (ZeroExt32to64 y) (Const64 <y.Type> [63]) (CMPconst [64] (ZeroExt32to64 y))))
(Rsh64x16 x y) -> (SRA x (CSEL {OpARM64LessThanU} <y.Type> (ZeroExt16to64 y) (Const64 <y.Type> [63]) (CMPconst [64] (ZeroExt16to64 y))))
(Rsh64x8 x y) -> (SRA x (CSEL {OpARM64LessThanU} <y.Type> (ZeroExt8to64 y) (Const64 <y.Type> [63]) (CMPconst [64] (ZeroExt8to64 y))))

(Rsh32x64 x y) -> (SRA (SignExt32to64 x) (CSEL {OpARM64LessThanU} <y.Type> y (Const64 <y.Type> [63]) (CMPconst [64] y)))
(Rsh32x32 x y) -> (SRA (SignExt32to64 x) (CSEL {OpARM64LessThanU} <y.Type> (ZeroExt32to64 y) (Const64 <y.Type> [63]) (CMPconst [64] (ZeroExt32to64 y))))
(Rsh32x16 x y) -> (SRA (SignExt32to64 x) (CSEL {OpARM64LessThanU} <y.Type> (ZeroExt16to64 y) (Const64 <y.Type> [63]) (CMPconst [64] (ZeroExt16to64 y))))
(Rsh32x8 x y) -> (SRA (SignExt32to64 x) (CSEL {OpARM64LessThanU} <y.Type> (ZeroExt8to64 y) (Const64 <y.Type> [63]) (CMPconst [64] (ZeroExt8to64 y))))

(Rsh16x64 x y) -> (SRA (SignExt16to64 x) (CSEL {OpARM64LessThanU} <y.Type> y (Const64 <y.Type> [63]) (CMPconst [64] y)))
(Rsh16x32 x y) -> (SRA (SignExt16to64 x) (CSEL {OpARM64LessThanU} <y.Type> (ZeroExt32to64 y) (Const64 <y.Type> [63]) (CMPconst [64] (ZeroExt32to64 y))))
(Rsh16x16 x y) -> (SRA (SignExt16to64 x) (CSEL {OpARM64LessThanU} <y.Type> (ZeroExt16to64 y) (Const64 <y.Type> [63]) (CMPconst [64] (ZeroExt16to64 y))))
(Rsh16x8 x y) -> (SRA (SignExt16to64 x) (CSEL {OpARM64LessThanU} <y.Type> (ZeroExt8to64 y) (Const64 <y.Type> [63]) (CMPconst [64] (ZeroExt8to64 y))))

(Rsh8x64 x y) -> (SRA (SignExt8to64 x) (CSEL {OpARM64LessThanU} <y.Type> y (Const64 <y.Type> [63]) (CMPconst [64] y)))
(Rsh8x32 x y) -> (SRA (SignExt8to64 x) (CSEL {OpARM64LessThanU} <y.Type> (ZeroExt32to64 y) (Const64 <y.Type> [63]) (CMPconst [64] (ZeroExt32to64 y))))
(Rsh8x16 x y) -> (SRA (SignExt8to64 x) (CSEL {OpARM64LessThanU} <y.Type> (ZeroExt16to64 y) (Const64 <y.Type> [63]) (CMPconst [64] (ZeroExt16to64 y))))
(Rsh8x8 x y) -> (SRA (SignExt8to64 x) (CSEL {OpARM64LessThanU} <y.Type> (ZeroExt8to64 y) (Const64 <y.Type> [63]) (CMPconst [64] (ZeroExt8to64 y))))
(Lsh64x64 <t> x y) => (CSEL {OpARM64LessThanU} (SLL <t> x y) (Const64 <t> [0]) (CMPconst [64] y))
(Lsh64x32 <t> x y) => (CSEL {OpARM64LessThanU} (SLL <t> x (ZeroExt32to64 y)) (Const64 <t> [0]) (CMPconst [64] (ZeroExt32to64 y)))
(Lsh64x16 <t> x y) => (CSEL {OpARM64LessThanU} (SLL <t> x (ZeroExt16to64 y)) (Const64 <t> [0]) (CMPconst [64] (ZeroExt16to64 y)))
(Lsh64x8 <t> x y) => (CSEL {OpARM64LessThanU} (SLL <t> x (ZeroExt8to64 y)) (Const64 <t> [0]) (CMPconst [64] (ZeroExt8to64 y)))

(Lsh32x64 <t> x y) => (CSEL {OpARM64LessThanU} (SLL <t> x y) (Const64 <t> [0]) (CMPconst [64] y))
(Lsh32x32 <t> x y) => (CSEL {OpARM64LessThanU} (SLL <t> x (ZeroExt32to64 y)) (Const64 <t> [0]) (CMPconst [64] (ZeroExt32to64 y)))
(Lsh32x16 <t> x y) => (CSEL {OpARM64LessThanU} (SLL <t> x (ZeroExt16to64 y)) (Const64 <t> [0]) (CMPconst [64] (ZeroExt16to64 y)))
(Lsh32x8 <t> x y) => (CSEL {OpARM64LessThanU} (SLL <t> x (ZeroExt8to64 y)) (Const64 <t> [0]) (CMPconst [64] (ZeroExt8to64 y)))

(Lsh16x64 <t> x y) => (CSEL {OpARM64LessThanU} (SLL <t> x y) (Const64 <t> [0]) (CMPconst [64] y))
(Lsh16x32 <t> x y) => (CSEL {OpARM64LessThanU} (SLL <t> x (ZeroExt32to64 y)) (Const64 <t> [0]) (CMPconst [64] (ZeroExt32to64 y)))
(Lsh16x16 <t> x y) => (CSEL {OpARM64LessThanU} (SLL <t> x (ZeroExt16to64 y)) (Const64 <t> [0]) (CMPconst [64] (ZeroExt16to64 y)))
(Lsh16x8 <t> x y) => (CSEL {OpARM64LessThanU} (SLL <t> x (ZeroExt8to64 y)) (Const64 <t> [0]) (CMPconst [64] (ZeroExt8to64 y)))

(Lsh8x64 <t> x y) => (CSEL {OpARM64LessThanU} (SLL <t> x y) (Const64 <t> [0]) (CMPconst [64] y))
(Lsh8x32 <t> x y) => (CSEL {OpARM64LessThanU} (SLL <t> x (ZeroExt32to64 y)) (Const64 <t> [0]) (CMPconst [64] (ZeroExt32to64 y)))
(Lsh8x16 <t> x y) => (CSEL {OpARM64LessThanU} (SLL <t> x (ZeroExt16to64 y)) (Const64 <t> [0]) (CMPconst [64] (ZeroExt16to64 y)))
(Lsh8x8 <t> x y) => (CSEL {OpARM64LessThanU} (SLL <t> x (ZeroExt8to64 y)) (Const64 <t> [0]) (CMPconst [64] (ZeroExt8to64 y)))

(Rsh64Ux64 <t> x y) => (CSEL {OpARM64LessThanU} (SRL <t> x y) (Const64 <t> [0]) (CMPconst [64] y))
(Rsh64Ux32 <t> x y) => (CSEL {OpARM64LessThanU} (SRL <t> x (ZeroExt32to64 y)) (Const64 <t> [0]) (CMPconst [64] (ZeroExt32to64 y)))
(Rsh64Ux16 <t> x y) => (CSEL {OpARM64LessThanU} (SRL <t> x (ZeroExt16to64 y)) (Const64 <t> [0]) (CMPconst [64] (ZeroExt16to64 y)))
(Rsh64Ux8 <t> x y) => (CSEL {OpARM64LessThanU} (SRL <t> x (ZeroExt8to64 y)) (Const64 <t> [0]) (CMPconst [64] (ZeroExt8to64 y)))

(Rsh32Ux64 <t> x y) => (CSEL {OpARM64LessThanU} (SRL <t> (ZeroExt32to64 x) y) (Const64 <t> [0]) (CMPconst [64] y))
(Rsh32Ux32 <t> x y) => (CSEL {OpARM64LessThanU} (SRL <t> (ZeroExt32to64 x) (ZeroExt32to64 y)) (Const64 <t> [0]) (CMPconst [64] (ZeroExt32to64 y)))
(Rsh32Ux16 <t> x y) => (CSEL {OpARM64LessThanU} (SRL <t> (ZeroExt32to64 x) (ZeroExt16to64 y)) (Const64 <t> [0]) (CMPconst [64] (ZeroExt16to64 y)))
(Rsh32Ux8 <t> x y) => (CSEL {OpARM64LessThanU} (SRL <t> (ZeroExt32to64 x) (ZeroExt8to64 y)) (Const64 <t> [0]) (CMPconst [64] (ZeroExt8to64 y)))

(Rsh16Ux64 <t> x y) => (CSEL {OpARM64LessThanU} (SRL <t> (ZeroExt16to64 x) y) (Const64 <t> [0]) (CMPconst [64] y))
(Rsh16Ux32 <t> x y) => (CSEL {OpARM64LessThanU} (SRL <t> (ZeroExt16to64 x) (ZeroExt32to64 y)) (Const64 <t> [0]) (CMPconst [64] (ZeroExt32to64 y)))
(Rsh16Ux16 <t> x y) => (CSEL {OpARM64LessThanU} (SRL <t> (ZeroExt16to64 x) (ZeroExt16to64 y)) (Const64 <t> [0]) (CMPconst [64] (ZeroExt16to64 y)))
(Rsh16Ux8 <t> x y) => (CSEL {OpARM64LessThanU} (SRL <t> (ZeroExt16to64 x) (ZeroExt8to64 y)) (Const64 <t> [0]) (CMPconst [64] (ZeroExt8to64 y)))

(Rsh8Ux64 <t> x y) => (CSEL {OpARM64LessThanU} (SRL <t> (ZeroExt8to64 x) y) (Const64 <t> [0]) (CMPconst [64] y))
(Rsh8Ux32 <t> x y) => (CSEL {OpARM64LessThanU} (SRL <t> (ZeroExt8to64 x) (ZeroExt32to64 y)) (Const64 <t> [0]) (CMPconst [64] (ZeroExt32to64 y)))
(Rsh8Ux16 <t> x y) => (CSEL {OpARM64LessThanU} (SRL <t> (ZeroExt8to64 x) (ZeroExt16to64 y)) (Const64 <t> [0]) (CMPconst [64] (ZeroExt16to64 y)))
(Rsh8Ux8 <t> x y) => (CSEL {OpARM64LessThanU} (SRL <t> (ZeroExt8to64 x) (ZeroExt8to64 y)) (Const64 <t> [0]) (CMPconst [64] (ZeroExt8to64 y)))

(Rsh64x64 x y) => (SRA x (CSEL {OpARM64LessThanU} <y.Type> y (Const64 <y.Type> [63]) (CMPconst [64] y)))
(Rsh64x32 x y) => (SRA x (CSEL {OpARM64LessThanU} <y.Type> (ZeroExt32to64 y) (Const64 <y.Type> [63]) (CMPconst [64] (ZeroExt32to64 y))))
(Rsh64x16 x y) => (SRA x (CSEL {OpARM64LessThanU} <y.Type> (ZeroExt16to64 y) (Const64 <y.Type> [63]) (CMPconst [64] (ZeroExt16to64 y))))
(Rsh64x8 x y) => (SRA x (CSEL {OpARM64LessThanU} <y.Type> (ZeroExt8to64 y) (Const64 <y.Type> [63]) (CMPconst [64] (ZeroExt8to64 y))))

(Rsh32x64 x y) => (SRA (SignExt32to64 x) (CSEL {OpARM64LessThanU} <y.Type> y (Const64 <y.Type> [63]) (CMPconst [64] y)))
(Rsh32x32 x y) => (SRA (SignExt32to64 x) (CSEL {OpARM64LessThanU} <y.Type> (ZeroExt32to64 y) (Const64 <y.Type> [63]) (CMPconst [64] (ZeroExt32to64 y))))
(Rsh32x16 x y) => (SRA (SignExt32to64 x) (CSEL {OpARM64LessThanU} <y.Type> (ZeroExt16to64 y) (Const64 <y.Type> [63]) (CMPconst [64] (ZeroExt16to64 y))))
(Rsh32x8 x y) => (SRA (SignExt32to64 x) (CSEL {OpARM64LessThanU} <y.Type> (ZeroExt8to64 y) (Const64 <y.Type> [63]) (CMPconst [64] (ZeroExt8to64 y))))

(Rsh16x64 x y) => (SRA (SignExt16to64 x) (CSEL {OpARM64LessThanU} <y.Type> y (Const64 <y.Type> [63]) (CMPconst [64] y)))
(Rsh16x32 x y) => (SRA (SignExt16to64 x) (CSEL {OpARM64LessThanU} <y.Type> (ZeroExt32to64 y) (Const64 <y.Type> [63]) (CMPconst [64] (ZeroExt32to64 y))))
(Rsh16x16 x y) => (SRA (SignExt16to64 x) (CSEL {OpARM64LessThanU} <y.Type> (ZeroExt16to64 y) (Const64 <y.Type> [63]) (CMPconst [64] (ZeroExt16to64 y))))
(Rsh16x8 x y) => (SRA (SignExt16to64 x) (CSEL {OpARM64LessThanU} <y.Type> (ZeroExt8to64 y) (Const64 <y.Type> [63]) (CMPconst [64] (ZeroExt8to64 y))))

(Rsh8x64 x y) => (SRA (SignExt8to64 x) (CSEL {OpARM64LessThanU} <y.Type> y (Const64 <y.Type> [63]) (CMPconst [64] y)))
(Rsh8x32 x y) => (SRA (SignExt8to64 x) (CSEL {OpARM64LessThanU} <y.Type> (ZeroExt32to64 y) (Const64 <y.Type> [63]) (CMPconst [64] (ZeroExt32to64 y))))
(Rsh8x16 x y) => (SRA (SignExt8to64 x) (CSEL {OpARM64LessThanU} <y.Type> (ZeroExt16to64 y) (Const64 <y.Type> [63]) (CMPconst [64] (ZeroExt16to64 y))))
(Rsh8x8 x y) => (SRA (SignExt8to64 x) (CSEL {OpARM64LessThanU} <y.Type> (ZeroExt8to64 y) (Const64 <y.Type> [63]) (CMPconst [64] (ZeroExt8to64 y))))

// constants
(Const(64|32|16|8) [val]) => (MOVDconst [int64(val)])
Expand Down Expand Up @@ -224,7 +224,7 @@
(SignExt16to64 ...) => (MOVHreg ...)
(SignExt32to64 ...) => (MOVWreg ...)

// float <-> int conversion
// float <=> int conversion
(Cvt32to32F ...) => (SCVTFWS ...)
(Cvt32to64F ...) => (SCVTFWD ...)
(Cvt64to32F ...) => (SCVTFS ...)
Expand Down Expand Up @@ -305,8 +305,8 @@
(FCMPD (FMOVDconst [0]) x) => (InvertFlags (FCMPD0 x))

// CSEL needs a flag-generating argument. Synthesize a CMPW if necessary.
(CondSelect x y boolval) && flagArg(boolval) != nil -> (CSEL {boolval.Op} x y flagArg(boolval))
(CondSelect x y boolval) && flagArg(boolval) == nil -> (CSEL {OpARM64NotEqual} x y (CMPWconst [0] boolval))
(CondSelect x y boolval) && flagArg(boolval) != nil => (CSEL {boolval.Op} x y flagArg(boolval))
(CondSelect x y boolval) && flagArg(boolval) == nil => (CSEL {OpARM64NotEqual} x y (CMPWconst [0] boolval))

(OffPtr [off] ptr:(SP)) && is32Bit(off) => (MOVDaddr [int32(off)] ptr)
(OffPtr [off] ptr) => (ADDconst [off] ptr)
Expand Down
2 changes: 2 additions & 0 deletions src/cmd/compile/internal/ssa/gen/rulegen.go
Original file line number Diff line number Diff line change
Expand Up @@ -1784,6 +1784,8 @@ func (op opData) auxType() string {
return "s390x.CCMask"
case "S390XRotateParams":
return "s390x.RotateParams"
case "CCop":
return "CCop"
default:
return "invalid"
}
Expand Down
4 changes: 4 additions & 0 deletions src/cmd/compile/internal/ssa/rewrite.go
Original file line number Diff line number Diff line change
Expand Up @@ -688,6 +688,10 @@ func s390xRotateParamsToAux(r s390x.RotateParams) interface{} {
return r
}

func cCopToAux(o Op) interface{} {
return o
}

// uaddOvf reports whether unsigned a+b would overflow.
func uaddOvf(a, b int64) bool {
return uint64(a)+uint64(b) < uint64(a)
Expand Down
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