| // Code generated by command: go run gen_fse.go -out ../fse_decoder.s -arch amd64,arm64 -pkg=zstd. DO NOT EDIT. |
| // EXPERIMENTAL arm64 output lowered from an amd64 avo program. |
| |
| //go:build arm64 && (!appengine && !noasm && gc && !noasm) |
| |
| // func buildDtable_asm(s *fseDecoder, ctx *buildDtableAsmContext) int |
| TEXT ·buildDtable_asm(SB), $0-24 |
| MOVD ctx+8(FP), R1 |
| MOVD s+0(FP), R6 |
| |
| // Load values |
| MOVBU 4098(R6), R2 |
| MOVD $0, R0 |
| MOVD $1, R16 |
| LSL R2, R16, R16 |
| ORR R16, R0, R0 |
| MOVD (R1), R3 |
| MOVD 16(R1), R5 |
| SUB $1, R0, R7 |
| MOVD 8(R1), R1 |
| MOVHU 4096(R6), R6 |
| |
| // End load values |
| // Init, lay down lowprob symbols |
| MOVD $0, R8 |
| JMP init_main_loop_condition |
| |
| init_main_loop: |
| MOVH (R1)(R8<<1), R9 |
| MOVD $-1, R16 |
| AND $0xffff, R16, R16 |
| AND $0xffff, R9, R15 |
| CMP R16, R15 |
| BNE do_not_update_high_threshold |
| ADD R7<<3, R5, R15 |
| MOVB R8, 1(R15) |
| SUB $1, R7, R7 |
| MOVD $0x0000000000000001, R9 |
| |
| do_not_update_high_threshold: |
| MOVH R9, (R3)(R8<<1) |
| ADD $1, R8, R8 |
| |
| init_main_loop_condition: |
| CMP R6, R8 |
| BLT init_main_loop |
| |
| // Spread symbols |
| // Calculate table step |
| MOVD R0, R8 |
| LSR $0x01, R8, R8 |
| MOVD R0, R9 |
| LSR $0x03, R9, R9 |
| ADD R9, R8, R8 |
| ADD $3, R8, R8 |
| |
| // Fill add bits values |
| SUB $1, R0, R9 |
| MOVD $0, R10 |
| MOVD $0, R11 |
| JMP spread_main_loop_condition |
| |
| spread_main_loop: |
| MOVD $0, R12 |
| MOVH (R1)(R11<<1), R13 |
| JMP spread_inner_loop_condition |
| |
| spread_inner_loop: |
| ADD R10<<3, R5, R15 |
| MOVB R11, 1(R15) |
| |
| adjust_position: |
| ADD R8, R10, R10 |
| AND R9, R10, R10 |
| CMP R7, R10 |
| BGT adjust_position |
| ADD $1, R12, R12 |
| |
| spread_inner_loop_condition: |
| CMP R13, R12 |
| BLT spread_inner_loop |
| ADD $1, R11, R11 |
| |
| spread_main_loop_condition: |
| CMP R6, R11 |
| BLT spread_main_loop |
| TST R10, R10 |
| BEQ spread_check_ok |
| MOVD ctx+8(FP), R0 |
| MOVD R10, 24(R0) |
| MOVD $+1, R16 |
| MOVD R16, ret+16(FP) |
| RET |
| |
| spread_check_ok: |
| // Build Decoding table |
| MOVD $0, R6 |
| |
| build_table_main_table: |
| ADD R6<<3, R5, R15 |
| MOVBU 1(R15), R1 |
| MOVHU (R3)(R1<<1), R7 |
| ADD $1, R7, R8 |
| MOVH R8, (R3)(R1<<1) |
| MOVD R7, R8 |
| CLZ R8, R16 |
| MOVD $63, R8 |
| SUB R16, R8, R8 |
| MOVD R2, R1 |
| SUB R8, R1, R1 |
| LSL R1, R7, R7 |
| SUB R0, R7, R7 |
| ADD R6<<3, R5, R15 |
| MOVB R1, (R15) |
| ADD R6<<3, R5, R15 |
| MOVH R7, 2(R15) |
| CMP R0, R7 |
| BLE build_table_check1_ok |
| MOVD ctx+8(FP), R1 |
| MOVD R7, 24(R1) |
| MOVD R0, 32(R1) |
| MOVD $+2, R16 |
| MOVD R16, ret+16(FP) |
| RET |
| |
| build_table_check1_ok: |
| TST $0xff, R1 |
| BNE build_table_check2_ok |
| AND $0xffff, R6, R16 |
| AND $0xffff, R7, R15 |
| CMP R16, R15 |
| BNE build_table_check2_ok |
| MOVD ctx+8(FP), R0 |
| MOVD R7, 24(R0) |
| MOVD R6, 32(R0) |
| MOVD $+3, R16 |
| MOVD R16, ret+16(FP) |
| RET |
| |
| build_table_check2_ok: |
| ADD $1, R6, R6 |
| CMP R0, R6 |
| BLT build_table_main_table |
| MOVD $+0, R16 |
| MOVD R16, ret+16(FP) |
| RET |
