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add arm64 version of polyMulBy2toD #565

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Merged
bwesterb merged 1 commit into from
Aug 17, 2025
+26 −1
Merged

add arm64 version of polyMulBy2toD #565

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5 changes: 4 additions & 1 deletion sign/internal/dilithium/arm64.go
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Original file line number Diff line number Diff line change
Expand Up @@ -81,7 +81,7 @@ func (p *Poly) Exceeds(bound uint32) bool {
//
// So it requires the coefficients of p to be less than 2³²⁻ᴰ.
func (p *Poly) MulBy2toD(q *Poly) {
p.mulBy2toDGeneric(q)
polyMulBy2toDARM64(p, q)
}

// Splits p into p1 and p0 such that [i]p1 * 2ᴰ + [i]p0 = [i]p
Expand All @@ -98,3 +98,6 @@ func polyAddARM64(p, a, b *Poly)

//go:noescape
func polyPackLe16ARM64(p *Poly, buf *byte)

//go:noescape
func polyMulBy2toDARM64(p, q *Poly)
22 changes: 22 additions & 0 deletions sign/internal/dilithium/arm64.s
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Expand Up @@ -69,3 +69,25 @@ loop:
BGT loop

RET

// func polyMulBy2toDARM64(p, q *Poly)
TEXT ·polyMulBy2toDARM64(SB), NOSPLIT|NOFRAME, $0-16
MOVD p+0(FP), R0
MOVD q+8(FP), R1

MOVW $(const_N / 16), R2

loop:
VLD1.P (64)(R1), [V0.S4, V1.S4, V2.S4, V3.S4]

VSHL $(const_D), V0.S4, V0.S4
VSHL $(const_D), V1.S4, V1.S4
VSHL $(const_D), V2.S4, V2.S4
VSHL $(const_D), V3.S4, V3.S4

VST1.P [V0.S4, V1.S4, V2.S4, V3.S4], (64)(R0)

SUBS $1, R2, R2
BGT loop

RET
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