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cmd/compile: Add shiftIsBounded check for logic shifts of arm64
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This CL adds shiftIsBounded checks for the Lsh* and Rsh* rules in arm64.
There is no need to check the shift value again with CMP + CSEL when the
shift value is valid.

Change-Id: I54620de64f02a1b5a11089add237248ae2de01b4
Reviewed-on: https://go-review.googlesource.com/c/go/+/417714
Reviewed-by: Keith Randall <[email protected]>
Reviewed-by: Keith Randall <[email protected]>
Reviewed-by: Heschi Kreinick <[email protected]>
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@RuinanSun @randall77
RuinanSun authored and randall77 committed Sep 7, 2022
1 parent e828fbd commit 454a058
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140 changes: 81 additions & 59 deletions src/cmd/compile/internal/ssa/gen/ARM64.rules
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Expand Up @@ -138,65 +138,87 @@
// 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))))

// check shiftIsBounded first, if shift value is proved to be valid then we
// can do the shift directly.
// left shift
(Lsh(64|32|16|8)x64 <t> x y) && shiftIsBounded(v) => (SLL <t> x y)
(Lsh(64|32|16|8)x32 <t> x y) && shiftIsBounded(v) => (SLL <t> x y)
(Lsh(64|32|16|8)x16 <t> x y) && shiftIsBounded(v) => (SLL <t> x y)
(Lsh(64|32|16|8)x8 <t> x y) && shiftIsBounded(v) => (SLL <t> x y)

// signed right shift
(Rsh64x(64|32|16|8) <t> x y) && shiftIsBounded(v) => (SRA <t> x y)
(Rsh32x(64|32|16|8) <t> x y) && shiftIsBounded(v) => (SRA <t> (SignExt32to64 x) y)
(Rsh16x(64|32|16|8) <t> x y) && shiftIsBounded(v) => (SRA <t> (SignExt16to64 x) y)
(Rsh8x(64|32|16|8) <t> x y) && shiftIsBounded(v) => (SRA <t> (SignExt8to64 x) y)

// unsigned right shift
(Rsh64Ux(64|32|16|8) <t> x y) && shiftIsBounded(v) => (SRL <t> x y)
(Rsh32Ux(64|32|16|8) <t> x y) && shiftIsBounded(v) => (SRL <t> (ZeroExt32to64 x) y)
(Rsh16Ux(64|32|16|8) <t> x y) && shiftIsBounded(v) => (SRL <t> (ZeroExt16to64 x) y)
(Rsh8Ux(64|32|16|8) <t> x y) && shiftIsBounded(v) => (SRL <t> (ZeroExt8to64 x) y)

// shift value may be out of range, use CMP + CSEL instead
(Lsh64x64 <t> x y) && !shiftIsBounded(v) => (CSEL [OpARM64LessThanU] (SLL <t> x y) (Const64 <t> [0]) (CMPconst [64] y))
(Lsh64x32 <t> x y) && !shiftIsBounded(v) => (CSEL [OpARM64LessThanU] (SLL <t> x y) (Const64 <t> [0]) (CMPconst [64] (ZeroExt32to64 y)))
(Lsh64x16 <t> x y) && !shiftIsBounded(v) => (CSEL [OpARM64LessThanU] (SLL <t> x y) (Const64 <t> [0]) (CMPconst [64] (ZeroExt16to64 y)))
(Lsh64x8 <t> x y) && !shiftIsBounded(v) => (CSEL [OpARM64LessThanU] (SLL <t> x y) (Const64 <t> [0]) (CMPconst [64] (ZeroExt8to64 y)))

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

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

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

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

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

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

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

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

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

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

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

// constants
(Const(64|32|16|8) [val]) => (MOVDconst [int64(val)])
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