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Diffstat (limited to '')
| -rw-r--r-- | src/internal/bytealg/index_s390x.s | 216 |
1 files changed, 216 insertions, 0 deletions
diff --git a/src/internal/bytealg/index_s390x.s b/src/internal/bytealg/index_s390x.s new file mode 100644 index 0000000..491d5bc --- /dev/null +++ b/src/internal/bytealg/index_s390x.s @@ -0,0 +1,216 @@ +// Copyright 2018 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +#include "go_asm.h" +#include "textflag.h" + +// Caller must confirm availability of vx facility before calling. +TEXT ·Index(SB),NOSPLIT|NOFRAME,$0-56 + LMG a_base+0(FP), R1, R2 // R1=&s[0], R2=len(s) + LMG b_base+24(FP), R3, R4 // R3=&sep[0], R4=len(sep) + MOVD $ret+48(FP), R5 + BR indexbody<>(SB) + +// Caller must confirm availability of vx facility before calling. +TEXT ·IndexString(SB),NOSPLIT|NOFRAME,$0-40 + LMG a_base+0(FP), R1, R2 // R1=&s[0], R2=len(s) + LMG b_base+16(FP), R3, R4 // R3=&sep[0], R4=len(sep) + MOVD $ret+32(FP), R5 + BR indexbody<>(SB) + +// s: string we are searching +// sep: string to search for +// R1=&s[0], R2=len(s) +// R3=&sep[0], R4=len(sep) +// R5=&ret (int) +// Caller must confirm availability of vx facility before calling. +TEXT indexbody<>(SB),NOSPLIT|NOFRAME,$0 + CMPBGT R4, R2, notfound + ADD R1, R2 + SUB R4, R2 // R2=&s[len(s)-len(sep)] (last valid index) + CMPBEQ R4, $0, notfound + SUB $1, R4 // R4=len(sep)-1 for use as VLL index + VLL R4, (R3), V0 // contains first 16 bytes of sep + MOVD R1, R7 +index2plus: + CMPBNE R4, $1, index3plus + MOVD $15(R7), R9 + CMPBGE R9, R2, index2to16 + VGBM $0xaaaa, V31 // 0xff00ff00ff00ff00... + VONE V16 + VREPH $0, V0, V1 + CMPBGE R9, R2, index2to16 +index2loop: + VL 0(R7), V2 // 16 bytes, even indices + VL 1(R7), V4 // 16 bytes, odd indices + VCEQH V1, V2, V5 // compare even indices + VCEQH V1, V4, V6 // compare odd indices + VSEL V5, V6, V31, V7 // merge even and odd indices + VFEEBS V16, V7, V17 // find leftmost index, set condition to 1 if found + BLT foundV17 + MOVD $16(R7), R7 // R7+=16 + ADD $15, R7, R9 + CMPBLE R9, R2, index2loop // continue if (R7+15) <= R2 (last index to search) + CMPBLE R7, R2, index2to16 + BR notfound + +index3plus: + CMPBNE R4, $2, index4plus + ADD $15, R7, R9 + CMPBGE R9, R2, index2to16 + MOVD $1, R0 + VGBM $0xaaaa, V31 // 0xff00ff00ff00ff00... + VONE V16 + VREPH $0, V0, V1 + VREPB $2, V0, V8 +index3loop: + VL (R7), V2 // load 16-bytes into V2 + VLL R0, 16(R7), V3 // load 2-bytes into V3 + VSLDB $1, V2, V3, V4 // V4=(V2:V3)<<1 + VSLDB $2, V2, V3, V9 // V9=(V2:V3)<<2 + VCEQH V1, V2, V5 // compare 2-byte even indices + VCEQH V1, V4, V6 // compare 2-byte odd indices + VCEQB V8, V9, V10 // compare last bytes + VSEL V5, V6, V31, V7 // merge even and odd indices + VN V7, V10, V7 // AND indices with last byte + VFEEBS V16, V7, V17 // find leftmost index, set condition to 1 if found + BLT foundV17 + MOVD $16(R7), R7 // R7+=16 + ADD $15, R7, R9 + CMPBLE R9, R2, index3loop // continue if (R7+15) <= R2 (last index to search) + CMPBLE R7, R2, index2to16 + BR notfound + +index4plus: + CMPBNE R4, $3, index5plus + ADD $15, R7, R9 + CMPBGE R9, R2, index2to16 + MOVD $2, R0 + VGBM $0x8888, V29 // 0xff000000ff000000... + VGBM $0x2222, V30 // 0x0000ff000000ff00... + VGBM $0xcccc, V31 // 0xffff0000ffff0000... + VONE V16 + VREPF $0, V0, V1 +index4loop: + VL (R7), V2 // load 16-bytes into V2 + VLL R0, 16(R7), V3 // load 3-bytes into V3 + VSLDB $1, V2, V3, V4 // V4=(V2:V3)<<1 + VSLDB $2, V2, V3, V9 // V9=(V2:V3)<<1 + VSLDB $3, V2, V3, V10 // V10=(V2:V3)<<1 + VCEQF V1, V2, V5 // compare index 0, 4, ... + VCEQF V1, V4, V6 // compare index 1, 5, ... + VCEQF V1, V9, V11 // compare index 2, 6, ... + VCEQF V1, V10, V12 // compare index 3, 7, ... + VSEL V5, V6, V29, V13 // merge index 0, 1, 4, 5, ... + VSEL V11, V12, V30, V14 // merge index 2, 3, 6, 7, ... + VSEL V13, V14, V31, V7 // final merge + VFEEBS V16, V7, V17 // find leftmost index, set condition to 1 if found + BLT foundV17 + MOVD $16(R7), R7 // R7+=16 + ADD $15, R7, R9 + CMPBLE R9, R2, index4loop // continue if (R7+15) <= R2 (last index to search) + CMPBLE R7, R2, index2to16 + BR notfound + +index5plus: + CMPBGT R4, $15, index17plus +index2to16: + CMPBGT R7, R2, notfound + MOVD $1(R7), R8 + CMPBGT R8, R2, index2to16tail +index2to16loop: + // unrolled 2x + VLL R4, (R7), V1 + VLL R4, 1(R7), V2 + VCEQGS V0, V1, V3 + BEQ found + MOVD $1(R7), R7 + VCEQGS V0, V2, V4 + BEQ found + MOVD $1(R7), R7 + CMPBLT R7, R2, index2to16loop + CMPBGT R7, R2, notfound +index2to16tail: + VLL R4, (R7), V1 + VCEQGS V0, V1, V2 + BEQ found + BR notfound + +index17plus: + CMPBGT R4, $31, index33plus + SUB $16, R4, R0 + VLL R0, 16(R3), V1 + VONE V7 +index17to32loop: + VL (R7), V2 + VLL R0, 16(R7), V3 + VCEQG V0, V2, V4 + VCEQG V1, V3, V5 + VN V4, V5, V6 + VCEQGS V6, V7, V8 + BEQ found + MOVD $1(R7), R7 + CMPBLE R7, R2, index17to32loop + BR notfound + +index33plus: + CMPBGT R4, $47, index49plus + SUB $32, R4, R0 + VL 16(R3), V1 + VLL R0, 32(R3), V2 + VONE V11 +index33to48loop: + VL (R7), V3 + VL 16(R7), V4 + VLL R0, 32(R7), V5 + VCEQG V0, V3, V6 + VCEQG V1, V4, V7 + VCEQG V2, V5, V8 + VN V6, V7, V9 + VN V8, V9, V10 + VCEQGS V10, V11, V12 + BEQ found + MOVD $1(R7), R7 + CMPBLE R7, R2, index33to48loop + BR notfound + +index49plus: + CMPBGT R4, $63, index65plus + SUB $48, R4, R0 + VL 16(R3), V1 + VL 32(R3), V2 + VLL R0, 48(R3), V3 + VONE V15 +index49to64loop: + VL (R7), V4 + VL 16(R7), V5 + VL 32(R7), V6 + VLL R0, 48(R7), V7 + VCEQG V0, V4, V8 + VCEQG V1, V5, V9 + VCEQG V2, V6, V10 + VCEQG V3, V7, V11 + VN V8, V9, V12 + VN V10, V11, V13 + VN V12, V13, V14 + VCEQGS V14, V15, V16 + BEQ found + MOVD $1(R7), R7 + CMPBLE R7, R2, index49to64loop +notfound: + MOVD $-1, (R5) + RET + +index65plus: + // not implemented + MOVD $0, (R0) + RET + +foundV17: // index is in doubleword V17[0] + VLGVG $0, V17, R8 + ADD R8, R7 +found: + SUB R1, R7 + MOVD R7, (R5) + RET |