mirror of https://github.com/golang/go.git
119 lines
2.0 KiB
ArmAsm
119 lines
2.0 KiB
ArmAsm
// Copyright 2018 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build mips64 mips64le
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#include "go_asm.h"
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#include "textflag.h"
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#define REGCTXT R22
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// memequal(a, b unsafe.Pointer, size uintptr) bool
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TEXT runtime·memequal(SB),NOSPLIT|NOFRAME,$0-25
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MOVV a+0(FP), R1
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MOVV b+8(FP), R2
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BEQ R1, R2, eq
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MOVV size+16(FP), R3
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ADDV R1, R3, R4
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// chunk size is 16
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SGTU $16, R3, R8
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BEQ R0, R8, chunk_entry
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byte_loop:
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BNE R1, R4, byte_test
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MOVV $1, R1
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MOVB R1, ret+24(FP)
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RET
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byte_test:
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MOVBU (R1), R6
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ADDV $1, R1
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MOVBU (R2), R7
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ADDV $1, R2
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BEQ R6, R7, byte_loop
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JMP not_eq
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chunk_entry:
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// make sure both a and b are aligned
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OR R1, R2, R9
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AND $0x7, R9
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BNE R0, R9, byte_loop
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JMP chunk_loop_1
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chunk_loop:
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// chunk size is 16
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SGTU $16, R3, R8
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BNE R0, R8, chunk_tail_8
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chunk_loop_1:
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MOVV (R1), R6
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MOVV (R2), R7
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BNE R6, R7, not_eq
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MOVV 8(R1), R12
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MOVV 8(R2), R13
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ADDV $16, R1
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ADDV $16, R2
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SUBV $16, R3
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BEQ R12, R13, chunk_loop
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JMP not_eq
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chunk_tail_8:
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AND $8, R3, R14
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BEQ R0, R14, chunk_tail_4
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MOVV (R1), R6
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MOVV (R2), R7
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BNE R6, R7, not_eq
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ADDV $8, R1
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ADDV $8, R2
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chunk_tail_4:
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AND $4, R3, R14
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BEQ R0, R14, chunk_tail_2
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MOVWU (R1), R6
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MOVWU (R2), R7
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BNE R6, R7, not_eq
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ADDV $4, R1
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ADDV $4, R2
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chunk_tail_2:
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AND $2, R3, R14
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BEQ R0, R14, chunk_tail_1
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MOVHU (R1), R6
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MOVHU (R2), R7
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BNE R6, R7, not_eq
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ADDV $2, R1
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ADDV $2, R2
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chunk_tail_1:
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AND $1, R3, R14
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BEQ R0, R14, eq
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MOVBU (R1), R6
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MOVBU (R2), R7
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BEQ R6, R7, eq
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not_eq:
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MOVB R0, ret+24(FP)
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RET
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eq:
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MOVV $1, R1
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MOVB R1, ret+24(FP)
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RET
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// memequal_varlen(a, b unsafe.Pointer) bool
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TEXT runtime·memequal_varlen(SB),NOSPLIT,$40-17
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MOVV a+0(FP), R1
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MOVV b+8(FP), R2
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BEQ R1, R2, eq
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MOVV 8(REGCTXT), R3 // compiler stores size at offset 8 in the closure
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MOVV R1, 8(R29)
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MOVV R2, 16(R29)
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MOVV R3, 24(R29)
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JAL runtime·memequal(SB)
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MOVBU 32(R29), R1
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MOVB R1, ret+16(FP)
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RET
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eq:
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MOVV $1, R1
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MOVB R1, ret+16(FP)
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RET
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