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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.
#include "go_asm.h"
#include "textflag.h"
TEXT ·Compare(SB),NOSPLIT|NOFRAME,$0-56
MOVD a_base+0(FP), R3
MOVD a_len+8(FP), R4
MOVD b_base+24(FP), R5
MOVD b_len+32(FP), R6
LA ret+48(FP), R7
BR cmpbody<>(SB)
TEXT runtime·cmpstring(SB),NOSPLIT|NOFRAME,$0-40
MOVD a_base+0(FP), R3
MOVD a_len+8(FP), R4
MOVD b_base+16(FP), R5
MOVD b_len+24(FP), R6
LA ret+32(FP), R7
BR cmpbody<>(SB)
// input:
// R3 = a
// R4 = alen
// R5 = b
// R6 = blen
// R7 = address of output word (stores -1/0/1 here)
TEXT cmpbody<>(SB),NOSPLIT|NOFRAME,$0-0
CMPBEQ R3, R5, cmplengths
MOVD R4, R8
CMPBLE R4, R6, amin
MOVD R6, R8
amin:
CMPBEQ R8, $0, cmplengths
CMP R8, $256
BLE tail
loop:
CLC $256, 0(R3), 0(R5)
BGT gt
BLT lt
SUB $256, R8
MOVD $256(R3), R3
MOVD $256(R5), R5
CMP R8, $256
BGT loop
tail:
SUB $1, R8
EXRL $cmpbodyclc<>(SB), R8
BGT gt
BLT lt
cmplengths:
CMP R4, R6
BEQ eq
BLT lt
gt:
MOVD $1, 0(R7)
RET
lt:
MOVD $-1, 0(R7)
RET
eq:
MOVD $0, 0(R7)
RET
TEXT cmpbodyclc<>(SB),NOSPLIT|NOFRAME,$0-0
CLC $1, 0(R3), 0(R5)
RET
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