[{"id":3676857,"web_url":"http://patchwork.ozlabs.org/comment/3676857/","msgid":"","list_archive_url":null,"date":"2026-04-13T17:11:10","subject":"Re: [PATCH] aarch64: Optimize memcmp for Kunpeng 950 with SVE","submitter":{"id":67598,"url":"http://patchwork.ozlabs.org/api/people/67598/","name":"Wilco Dijkstra","email":"Wilco.Dijkstra@arm.com"},"content":"Hi Weihong,\n\nA few comments/questions:\n\n+ENTRY (__memcmp_kunpeng950)\n+    whilelo p0.b, xzr, cnt\n+    b.none  L(equal)\n+    rdvl    off_vl, #1\n\nWhy use RDVL rather than CNTB? CNTB is faster for simple cases on various\nSVE implementations. And if needed you can compute 2x/3x/4x using simple\nshifts/adds.\n\n+    ld1b    z0.b, p0/z, [src1]\n+    ld1b    z1.b, p0/z, [src2]\n+    cmpne   p1.b, p0/z, z0.b, z1.b\n+    b.any   L(mismatch0)\n+\n+    whilelo p2.b, off_vl, cnt\n+    b.none  L(equal)\n+    rdvl    off_vlx2, #2\n+    ld1b    z2.b, p2/z, [src1, off_vl]\n+    ld1b    z3.b, p2/z, [src2, off_vl]\n\nIs there a reason not to use [src1, 1, mul vl] here? It should be cheap.\n\n+    cmpne   p3.b, p2/z, z2.b, z3.b\n+    b.any   L(mismatch1)\n\nWhy not reuse z0.b/z1.b/p1.b and branch to mismatch0 rather than repeat the code?\n\n+    whilelo p4.b, off_vlx2, cnt\n+    b.none  L(equal)\n+    rdvl    off_vlx3, #3\n+    ld1b    z6.b, p4/z, [src1, off_vlx2]\n+    ld1b    z7.b, p4/z, [src2, off_vlx2]\n+    cmpne   p5.b, p4/z, z6.b, z7.b\n+    b.any   L(mismatch2)\n+\n+    whilelo p6.b, off_vlx3, cnt\n+    b.none  L(equal)\n+    rdvl    current, #4\n+    ld1b    z16.b, p6/z, [src1, off_vlx3]\n+    ld1b    z17.b, p6/z, [src2, off_vlx3]\n+    cmpne   p7.b, p6/z, z16.b, z17.b\n+    b.any   L(mismatch3)\n\nIs it really worth doing 4x unrolling here?\n\n+    subs    safe_limit, cnt, current\n+    csel    safe_limit, safe_limit, xzr, hs // Saturate to 0 if cnt < 4VL to prevent unsigned underflow\n\nRather than use CSEL, we can just do b.lo L(equal) and skip all the tail code.\n\n+    cmp     current, safe_limit\n+    b.hi    L(tail_4xvl)\n+\n+    ptrue   p0.b\n\nNo need for this - the first WHILELO p0.b ensures we have all true in p0.\n\n+    .p2align 4\n+L(loop_full):\n+    addvl   off_vl, current, #1\n+    addvl   off_vlx2, current, #2\n+    addvl   off_vlx3, current, #3\n\nThat's a lot of unnecessary ADDVL - it would be better to increment src1/src2 and\nuse 1/2/3, mul vl as offset. Or just reuse off_vl, off_vlx2, off_vlx3.\n\n+    ld1b    z0.b, p0/z, [src1, current]\n+    ld1b    z1.b, p0/z, [src2, current]\n+    cmpne   p1.b, p0/z, z0.b, z1.b\n+    b.any   L(mismatch0)\n+\n+    ld1b    z2.b, p0/z, [src1, off_vl]\n+    ld1b    z3.b, p0/z, [src2, off_vl]\n+    cmpne   p3.b, p0/z, z2.b, z3.b\n+    b.any   L(mismatch1_full)\n\nIt's likely better to compute 2 vectors at a time similar to current memcmp.\n\nAlso it's not clear to me why 4x unrolling is used, if we avoid the 3 ADDVL,\nis it really faster than 2x unrolling?\n\n+    ld1b    z6.b, p0/z, [src1, off_vlx2]\n+    ld1b    z7.b, p0/z, [src2, off_vlx2]\n+    cmpne   p5.b, p0/z, z6.b, z7.b\n+    b.any   L(mismatch2_full)\n+\n+    ld1b    z16.b, p0/z, [src1, off_vlx3]\n+    ld1b    z17.b, p0/z, [src2, off_vlx3]\n+    cmpne   p7.b, p0/z, z16.b, z17.b\n+    b.any   L(mismatch3_full)\n+\n+    addvl   current, current, #4\n+    cmp     current, safe_limit\n+    b.le    L(loop_full)\n+\n+L(tail_4xvl):\n+    whilelo p0.b, current, cnt\n+    b.none  L(equal)\n+    addvl   off_vl, current, #1\n+    ld1b    z0.b, p0/z, [src1, current]\n+    ld1b    z1.b, p0/z, [src2, current]\n+    cmpne   p1.b, p0/z, z0.b, z1.b\n+    b.any   L(mismatch0)\n+\n+    whilelo p2.b, off_vl, cnt\n+    b.none  L(equal)\n+    addvl   off_vlx2, current, #2\n+    ld1b    z2.b, p2/z, [src1, off_vl]\n+    ld1b    z3.b, p2/z, [src2, off_vl]\n+    cmpne   p3.b, p2/z, z2.b, z3.b\n+    b.any   L(mismatch1)\n+\n+    whilelo p4.b, off_vlx2, cnt\n+    b.none  L(equal)\n+    addvl   off_vlx3, current, #3\n+    ld1b    z6.b, p4/z, [src1, off_vlx2]\n+    ld1b    z7.b, p4/z, [src2, off_vlx2]\n+    cmpne   p5.b, p4/z, z6.b, z7.b\n+    b.any   L(mismatch2)\n+\n+    whilelo p6.b, off_vlx3, cnt\n+    b.none  L(equal)\n+    ld1b    z16.b, p6/z, [src1, off_vlx3]\n+    ld1b    z17.b, p6/z, [src2, off_vlx3]\n+    cmpne   p7.b, p6/z, z16.b, z17.b\n+    b.any   L(mismatch3)\n+\n+    b   L(equal)\n\nDoes 4x unrolling the tail code really help performance?\n\n+L(mismatch1_full):\n+    brkb    p2.b, p0/z, p3.b\n+    lasta   w0, p2, z2.b\n+    lasta   w1, p2, z3.b\n+    sub     x0, x0, x1\n+    ret\n+\n+L(mismatch2_full):\n+    brkb    p2.b, p0/z, p5.b\n+    lasta   w0, p2, z6.b\n+    lasta   w1, p2, z7.b\n+    sub     x0, x0, x1\n+    ret\n+\n+L(mismatch3_full):\n+    brkb    p2.b, p0/z, p7.b\n+    lasta   w0, p2, z16.b\n+    lasta   w1, p2, z17.b\n+    sub     x0, x0, x1\n+    ret\n+\n+L(mismatch0):\n+    brkb    p2.b, p0/z, p1.b\n+    lasta   w0, p2, z0.b\n+    lasta   w1, p2, z1.b\n+    sub     x0, x0, x1\n+    ret\n+\n+L(mismatch1):\n+    brkb    p0.b, p2/z, p3.b\n+    lasta   w0, p0, z2.b\n+    lasta   w1, p0, z3.b\n+    sub     x0, x0, x1\n+    ret\n+\n+L(mismatch2):\n+    brkb    p6.b, p4/z, p5.b\n+    lasta   w0, p6, z6.b\n+    lasta   w1, p6, z7.b\n+    sub     x0, x0, x1\n+    ret\n+\n+L(mismatch3):\n+    brkb    p4.b, p6/z, p7.b\n+    lasta   w0, p4, z16.b\n+    lasta   w1, p4, z17.b\n+    sub     x0, x0, x1\n+    ret\n\nThat's 7 copies of the same sequence - by using the same register/predicates it should\nbe feasible to use just 1 copy.\n\n+L(equal):\n+    mov x0, #0\n+    ret\n+END (__memcmp_kunpeng950)\n\nCheers,\nWilco","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","libc-alpha@sourceware.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","libc-alpha@sourceware.org"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=arm.com header.i=@arm.com header.a=rsa-sha256\n header.s=selector1 header.b=sKpUv8gb;\n\tdkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com\n header.a=rsa-sha256 header.s=selector1 header.b=sKpUv8gb;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=sourceware.org\n (client-ip=2620:52:6:3111::32; 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