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core/vm: reduce allocations in precompiled contracts

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BZO95 2026-01-11 12:32:41 +08:00
parent 127d1f42bb
commit 950a4e3ac9
1 changed files with 8 additions and 8 deletions
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16
core/vm/contracts.go
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@ -898,12 +898,12 @@ func (c *blake2F) Run(input []byte) ([]byte, error) {
// Execute the compression function, extract and return the result // Execute the compression function, extract and return the result
blake2b.F(&h, m, t, final, rounds) blake2b.F(&h, m, t, final, rounds)
output := make([]byte, 64) var output [64]byte
for i := 0; i < 8; i++ { for i := 0; i < 8; i++ {
offset := i * 8 offset := i * 8
binary.LittleEndian.PutUint64(output[offset:offset+8], h[i]) binary.LittleEndian.PutUint64(output[offset:offset+8], h[i])
} }
return output, nil return output[:], nil
} }
func (c *blake2F) Name() string { func (c *blake2F) Name() string {
@ -1179,14 +1179,14 @@ func (c *bls12381Pairing) Run(input []byte) ([]byte, error) {
q = append(q, *p2) q = append(q, *p2)
} }
// Prepare 32 byte output // Prepare 32 byte output
out := make([]byte, 32) var out [32]byte
// Compute pairing and set the result // Compute pairing and set the result
ok, err := bls12381.PairingCheck(p, q) ok, err := bls12381.PairingCheck(p, q)
if err == nil && ok { if err == nil && ok {
out[31] = 1 out[31] = 1
} }
return out, nil return out[:], nil
} }
func (c *bls12381Pairing) Name() string { func (c *bls12381Pairing) Name() string {
@ -1264,22 +1264,22 @@ func decodeBLS12381FieldElement(in []byte) (fp.Element, error) {
// encodePointG1 encodes a point into 128 bytes. // encodePointG1 encodes a point into 128 bytes.
func encodePointG1(p *bls12381.G1Affine) []byte { func encodePointG1(p *bls12381.G1Affine) []byte {
out := make([]byte, 128) var out [128]byte
fp.BigEndian.PutElement((*[fp.Bytes]byte)(out[16:]), p.X) fp.BigEndian.PutElement((*[fp.Bytes]byte)(out[16:]), p.X)
fp.BigEndian.PutElement((*[fp.Bytes]byte)(out[64+16:]), p.Y) fp.BigEndian.PutElement((*[fp.Bytes]byte)(out[64+16:]), p.Y)
return out return out[:]
} }
// encodePointG2 encodes a point into 256 bytes. // encodePointG2 encodes a point into 256 bytes.
func encodePointG2(p *bls12381.G2Affine) []byte { func encodePointG2(p *bls12381.G2Affine) []byte {
out := make([]byte, 256) var out [256]byte
// encode x // encode x
fp.BigEndian.PutElement((*[fp.Bytes]byte)(out[16:16+48]), p.X.A0) fp.BigEndian.PutElement((*[fp.Bytes]byte)(out[16:16+48]), p.X.A0)
fp.BigEndian.PutElement((*[fp.Bytes]byte)(out[80:80+48]), p.X.A1) fp.BigEndian.PutElement((*[fp.Bytes]byte)(out[80:80+48]), p.X.A1)
// encode y // encode y
fp.BigEndian.PutElement((*[fp.Bytes]byte)(out[144:144+48]), p.Y.A0) fp.BigEndian.PutElement((*[fp.Bytes]byte)(out[144:144+48]), p.Y.A0)
fp.BigEndian.PutElement((*[fp.Bytes]byte)(out[208:208+48]), p.Y.A1) fp.BigEndian.PutElement((*[fp.Bytes]byte)(out[208:208+48]), p.Y.A1)
return out return out[:]
} }
// bls12381MapG1 implements EIP-2537 MapG1 precompile. // bls12381MapG1 implements EIP-2537 MapG1 precompile.