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equal_mips64x.s
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// 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.
//go:build mips64 || mips64le
#include "go_asm.h"
#include "textflag.h"
#define REGCTXT R22
// memequal(a, b unsafe.Pointer, size uintptr) bool
TEXT runtime·memequal(SB),NOSPLIT|NOFRAME,$0-25
MOVV a+0(FP), R1
MOVV b+8(FP), R2
BEQ R1, R2, eq
MOVV size+16(FP), R3
ADDV R1, R3, R4
// chunk size is 16
SGTU $16, R3, R8
BEQ R0, R8, chunk_entry
byte_loop:
BNE R1, R4, byte_test
MOVV $1, R1
MOVB R1, ret+24(FP)
RET
byte_test:
MOVBU (R1), R6
ADDV $1, R1
MOVBU (R2), R7
ADDV $1, R2
BEQ R6, R7, byte_loop
JMP not_eq
chunk_entry:
// make sure both a and b are aligned
OR R1, R2, R9
AND $0x7, R9
BNE R0, R9, byte_loop
JMP chunk_loop_1
chunk_loop:
// chunk size is 16
SGTU $16, R3, R8
BNE R0, R8, chunk_tail_8
chunk_loop_1:
MOVV (R1), R6
MOVV (R2), R7
BNE R6, R7, not_eq
MOVV 8(R1), R12
MOVV 8(R2), R13
ADDV $16, R1
ADDV $16, R2
SUBV $16, R3
BEQ R12, R13, chunk_loop
JMP not_eq
chunk_tail_8:
AND $8, R3, R14
BEQ R0, R14, chunk_tail_4
MOVV (R1), R6
MOVV (R2), R7
BNE R6, R7, not_eq
ADDV $8, R1
ADDV $8, R2
chunk_tail_4:
AND $4, R3, R14
BEQ R0, R14, chunk_tail_2
MOVWU (R1), R6
MOVWU (R2), R7
BNE R6, R7, not_eq
ADDV $4, R1
ADDV $4, R2
chunk_tail_2:
AND $2, R3, R14
BEQ R0, R14, chunk_tail_1
MOVHU (R1), R6
MOVHU (R2), R7
BNE R6, R7, not_eq
ADDV $2, R1
ADDV $2, R2
chunk_tail_1:
AND $1, R3, R14
BEQ R0, R14, eq
MOVBU (R1), R6
MOVBU (R2), R7
BEQ R6, R7, eq
not_eq:
MOVB R0, ret+24(FP)
RET
eq:
MOVV $1, R1
MOVB R1, ret+24(FP)
RET
// memequal_varlen(a, b unsafe.Pointer) bool
TEXT runtime·memequal_varlen(SB),NOSPLIT,$40-17
MOVV a+0(FP), R1
MOVV b+8(FP), R2
BEQ R1, R2, eq
MOVV 8(REGCTXT), R3 // compiler stores size at offset 8 in the closure
MOVV R1, 8(R29)
MOVV R2, 16(R29)
MOVV R3, 24(R29)
JAL runtime·memequal(SB)
MOVBU 32(R29), R1
MOVB R1, ret+16(FP)
RET
eq:
MOVV $1, R1
MOVB R1, ret+16(FP)
RET