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Since the implementation is identical, I believe it wouldn't make sense = to use up another instruction with the same implementation. =20 Table 6 in section 4.2 uses the direction-agnostic description for TO_BE = of "convert between host byte order and big endian" which I think is good. But then it says: > {END, TO_BE, ALU} with 'imm' =3D 16/32/64 means: > > dst =3D htobe16(dst) > dst =3D htobe32(dst) > dst =3D htobe64(dst) Where section 2.2 confusingly defines it as direction-specific as you = noted: > htobe16: Takes an unsigned 16-bit number in host-endian format and > returns the equivalent number as an unsigned 16-bit number in = big-endian format. Whereas bswap16 is direction agnostic: > bswap16: Takes an unsigned 16-bit number in either big- or = little-endian format > and returns the equivalent number with the same bit width but opposite = endianness. I think the right way to address your comment is to change 2.2 and = perhaps the function name to be direction agnostic and match the description in = table 6. For example: * bebswap16: Takes an unsigned 16-bit number and converts it between = host byte order and big endian. That is, on a big-endian platform the value is = left unchanged and on a little-endian platform the behavior is the same as bswap16. 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no-senders; approved; emergency; loop; banned-address; member-moderation; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header CC: draft-ietf-bpf-isa@ietf.org, bpf-chairs@ietf.org, bpf@ietf.org, void@manifault.com, bpf@vger.kernel.org X-Mailman-Version: 3.3.9rc4 Precedence: list Subject: =?utf-8?q?=5BBpf=5D_=C3=89ric_Vyncke=27s_feedback_on_byteswap_functions?= Archived-At: List-Archive: List-Help: List-Owner: List-Post: X-Mailman-Copy: yes Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 X-Original-From: Dave Thaler From: Dave Thaler Message-ID: <20240620195937.Rt-U3dq1XfxxZ4ZlKDzjYJsg6T-yBt7wIiudqqEj-Yg@z> w4lyaWMgVnluY2tlIHdyb3RlOiANCj4gMikgSSBmaW5kIHB1enpsaW5nIHRoZSBhYnNlbmNlIG9m IGJldG9oMTYoKSBpbiB0aGUgcHJlc2VuY2Ugb2YgaHRvYmUxNigpDQo+IGZ1bmN0aW9ucy4NCg0K U2luY2UgdGhlIGltcGxlbWVudGF0aW9uIGlzIGlkZW50aWNhbCwgSSBiZWxpZXZlIGl0IHdvdWxk bid0IG1ha2Ugc2Vuc2UgdG8NCnVzZSB1cCBhbm90aGVyIGluc3RydWN0aW9uIHdpdGggdGhlIHNh bWUgaW1wbGVtZW50YXRpb24uICANCg0KVGFibGUgNiBpbiBzZWN0aW9uIDQuMiB1c2VzIHRoZSBk aXJlY3Rpb24tYWdub3N0aWMgZGVzY3JpcHRpb24gZm9yIFRPX0JFIG9mDQoiY29udmVydCBiZXR3 ZWVuIGhvc3QgYnl0ZSBvcmRlciBhbmQgYmlnIGVuZGlhbiIgd2hpY2ggSSB0aGluayBpcyBnb29k Lg0KQnV0IHRoZW4gaXQgc2F5czoNCg0KPiB7RU5ELCBUT19CRSwgQUxVfSB3aXRoICdpbW0nID0g MTYvMzIvNjQgbWVhbnM6DQo+DQo+IGRzdCA9IGh0b2JlMTYoZHN0KQ0KPiBkc3QgPSBodG9iZTMy KGRzdCkNCj4gZHN0ID0gaHRvYmU2NChkc3QpDQoNCldoZXJlIHNlY3Rpb24gMi4yIGNvbmZ1c2lu Z2x5IGRlZmluZXMgaXQgYXMgZGlyZWN0aW9uLXNwZWNpZmljIGFzIHlvdSBub3RlZDoNCg0KPiBo dG9iZTE2OiBUYWtlcyBhbiB1bnNpZ25lZCAxNi1iaXQgbnVtYmVyIGluIGhvc3QtZW5kaWFuIGZv cm1hdCBhbmQNCj4gcmV0dXJucyB0aGUgZXF1aXZhbGVudCBudW1iZXIgYXMgYW4gdW5zaWduZWQg MTYtYml0IG51bWJlciBpbiBiaWctZW5kaWFuIGZvcm1hdC4NCg0KV2hlcmVhcyBic3dhcDE2IGlz IGRpcmVjdGlvbiBhZ25vc3RpYzoNCj4gYnN3YXAxNjogVGFrZXMgYW4gdW5zaWduZWQgMTYtYml0 IG51bWJlciBpbiBlaXRoZXIgYmlnLSBvciBsaXR0bGUtZW5kaWFuIGZvcm1hdA0KPiBhbmQgcmV0 dXJucyB0aGUgZXF1aXZhbGVudCBudW1iZXIgd2l0aCB0aGUgc2FtZSBiaXQgd2lkdGggYnV0IG9w cG9zaXRlIGVuZGlhbm5lc3MuDQoNCkkgdGhpbmsgdGhlIHJpZ2h0IHdheSB0byBhZGRyZXNzIHlv dXIgY29tbWVudCBpcyB0byBjaGFuZ2UgMi4yIGFuZCBwZXJoYXBzDQp0aGUgZnVuY3Rpb24gbmFt ZSB0byBiZSBkaXJlY3Rpb24gYWdub3N0aWMgYW5kIG1hdGNoIHRoZSBkZXNjcmlwdGlvbiBpbiB0 YWJsZSA2Lg0KRm9yIGV4YW1wbGU6DQoNCiogYmVic3dhcDE2OiBUYWtlcyBhbiB1bnNpZ25lZCAx Ni1iaXQgbnVtYmVyIGFuZCBjb252ZXJ0cyBpdCBiZXR3ZWVuIGhvc3QgYnl0ZQ0Kb3JkZXIgYW5k IGJpZyBlbmRpYW4uICBUaGF0IGlzLCBvbiBhIGJpZy1lbmRpYW4gcGxhdGZvcm0gdGhlIHZhbHVl IGlzIGxlZnQgdW5jaGFuZ2VkDQphbmQgb24gYSBsaXR0bGUtZW5kaWFuIHBsYXRmb3JtIHRoZSBi ZWhhdmlvciBpcyB0aGUgc2FtZSBhcyBic3dhcDE2Lg0KDQpEYXZlDQoNCi0tIApCcGYgbWFpbGlu ZyBsaXN0IC0tIGJwZkBpZXRmLm9yZwpUbyB1bnN1YnNjcmliZSBzZW5kIGFuIGVtYWlsIHRvIGJw Zi1sZWF2ZUBpZXRmLm9yZwo=