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Diffstat (limited to 'src/bytes/bytes_arm64.s')
| -rw-r--r-- | src/bytes/bytes_arm64.s | 197 |
1 files changed, 0 insertions, 197 deletions
diff --git a/src/bytes/bytes_arm64.s b/src/bytes/bytes_arm64.s deleted file mode 100644 index 84e96d52ce..0000000000 --- a/src/bytes/bytes_arm64.s +++ /dev/null @@ -1,197 +0,0 @@ -// Copyright 2017 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 "textflag.h" - -// countByte(s []byte, c byte) int -TEXT bytes·countByte(SB),NOSPLIT,$0-40 - MOVD s_base+0(FP), R0 - MOVD s_len+8(FP), R2 - MOVBU c+24(FP), R1 - // R11 = count of byte to search - MOVD $0, R11 - // short path to handle 0-byte case - CBZ R2, done - CMP $0x20, R2 - // jump directly to tail if length < 32 - BLO tail - ANDS $0x1f, R0, R9 - BEQ chunk - // Work with not 32-byte aligned head - BIC $0x1f, R0, R3 - ADD $0x20, R3 -head_loop: - MOVBU.P 1(R0), R5 - CMP R5, R1 - CINC EQ, R11, R11 - SUB $1, R2, R2 - CMP R0, R3 - BNE head_loop - // Work with 32-byte aligned chunks -chunk: - BIC $0x1f, R2, R9 - // The first chunk can also be the last - CBZ R9, tail - // R3 = end of 32-byte chunks - ADD R0, R9, R3 - MOVD $1, R5 - VMOV R5, V5.B16 - // R2 = length of tail - SUB R9, R2, R2 - // Duplicate R1 (byte to search) to 16 1-byte elements of V0 - VMOV R1, V0.B16 - // Clear the low 64-bit element of V7 and V8 - VEOR V7.B8, V7.B8, V7.B8 - VEOR V8.B8, V8.B8, V8.B8 - // Count the target byte in 32-byte chunk -chunk_loop: - VLD1.P (R0), [V1.B16, V2.B16] - CMP R0, R3 - VCMEQ V0.B16, V1.B16, V3.B16 - VCMEQ V0.B16, V2.B16, V4.B16 - // Clear the higher 7 bits - VAND V5.B16, V3.B16, V3.B16 - VAND V5.B16, V4.B16, V4.B16 - // Count lanes match the requested byte - VADDP V4.B16, V3.B16, V6.B16 // 32B->16B - VUADDLV V6.B16, V7 - // Accumulate the count in low 64-bit element of V8 when inside the loop - VADD V7, V8 - BNE chunk_loop - VMOV V8.D[0], R6 - ADD R6, R11, R11 - CBZ R2, done -tail: - // Work with tail shorter than 32 bytes - MOVBU.P 1(R0), R5 - SUB $1, R2, R2 - CMP R5, R1 - CINC EQ, R11, R11 - CBNZ R2, tail -done: - MOVD R11, ret+32(FP) - RET - -// indexShortStr(s, sep []byte) int -// precondition: 2 <= len(sep) <= 8 -TEXT bytes·indexShortStr(SB),NOSPLIT,$0-56 - // main idea is to load 'sep' into separate register(s) - // to avoid repeatedly re-load it again and again - // for sebsequent substring comparisons - MOVD s+0(FP), R0 - MOVD s_len+8(FP), R1 - MOVD sep+24(FP), R2 - MOVD sep_len+32(FP), R3 - SUB R3, R1, R4 - // R4 contains the start of last substring for comparsion - ADD R0, R4, R4 - ADD $1, R0, R8 - TBZ $3, R3, len_2_7 -len_8: - // R5 contains 8-byte sep - MOVD (R2), R5 -loop_8: - // R6 contains substring for comparison - MOVD.P 1(R0), R6 - CMP R5, R6 - BEQ found - CMP R4, R0 - BLS loop_8 - JMP not_found -len_2_7: - TBZ $2, R3, len_2_3 - TBZ $1, R3, len_4_5 - TBZ $0, R3, len_6 -len_7: - // R5 and R6 contain 7-byte sep - MOVWU (R2), R5 - // 1-byte overlap with R5 - MOVWU 3(R2), R6 -loop_7: - MOVWU.P 1(R0), R3 - CMP R5, R3 - BNE not_equal_7 - MOVWU 2(R0), R3 - CMP R6, R3 - BEQ found -not_equal_7: - CMP R4, R0 - BLS loop_7 - JMP not_found -len_6: - // R5 and R6 contain 6-byte sep - MOVWU (R2), R5 - MOVHU 4(R2), R6 -loop_6: - MOVWU.P 1(R0), R3 - CMP R5, R3 - BNE not_equal_6 - MOVHU 3(R0), R3 - CMP R6, R3 - BEQ found -not_equal_6: - CMP R4, R0 - BLS loop_6 - JMP not_found -len_4_5: - TBZ $0, R3, len_4 -len_5: - // R5 and R7 contain 5-byte sep - MOVWU (R2), R5 - MOVBU 4(R2), R7 -loop_5: - MOVWU.P 1(R0), R3 - CMP R5, R3 - BNE not_equal_5 - MOVBU 3(R0), R3 - CMP R7, R3 - BEQ found -not_equal_5: - CMP R4, R0 - BLS loop_5 - JMP not_found -len_4: - // R5 contains 4-byte sep - MOVWU (R2), R5 -loop_4: - MOVWU.P 1(R0), R6 - CMP R5, R6 - BEQ found - CMP R4, R0 - BLS loop_4 - JMP not_found -len_2_3: - TBZ $0, R3, len_2 -len_3: - // R6 and R7 contain 3-byte sep - MOVHU (R2), R6 - MOVBU 2(R2), R7 -loop_3: - MOVHU.P 1(R0), R3 - CMP R6, R3 - BNE not_equal_3 - MOVBU 1(R0), R3 - CMP R7, R3 - BEQ found -not_equal_3: - CMP R4, R0 - BLS loop_3 - JMP not_found -len_2: - // R5 contains 2-byte sep - MOVHU (R2), R5 -loop_2: - MOVHU.P 1(R0), R6 - CMP R5, R6 - BEQ found - CMP R4, R0 - BLS loop_2 -not_found: - MOVD $-1, R0 - MOVD R0, ret+48(FP) - RET -found: - SUB R8, R0, R0 - MOVD R0, ret+48(FP) - RET |