summaryrefslogtreecommitdiffstats
path: root/src/internal/bytealg/index_s390x.s
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--src/internal/bytealg/index_s390x.s216
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