Text file src/internal/bytealg/compare_s390x.s

     1	// Copyright 2018 The Go Authors. All rights reserved.
     2	// Use of this source code is governed by a BSD-style
     3	// license that can be found in the LICENSE file.
     4	
     5	#include "go_asm.h"
     6	#include "textflag.h"
     7	
     8	TEXT ·Compare(SB),NOSPLIT|NOFRAME,$0-56
     9		MOVD	a_base+0(FP), R3
    10		MOVD	a_len+8(FP), R4
    11		MOVD	b_base+24(FP), R5
    12		MOVD	b_len+32(FP), R6
    13		LA	ret+48(FP), R7
    14		BR	cmpbody<>(SB)
    15	
    16	TEXT runtime·cmpstring(SB),NOSPLIT|NOFRAME,$0-40
    17		MOVD	a_base+0(FP), R3
    18		MOVD	a_len+8(FP), R4
    19		MOVD	b_base+16(FP), R5
    20		MOVD	b_len+24(FP), R6
    21		LA	ret+32(FP), R7
    22		BR	cmpbody<>(SB)
    23	
    24	// input:
    25	//   R3 = a
    26	//   R4 = alen
    27	//   R5 = b
    28	//   R6 = blen
    29	//   R7 = address of output word (stores -1/0/1 here)
    30	TEXT cmpbody<>(SB),NOSPLIT|NOFRAME,$0-0
    31		CMPBEQ	R3, R5, cmplengths
    32		MOVD	R4, R8
    33		CMPBLE	R4, R6, amin
    34		MOVD	R6, R8
    35	amin:
    36		CMPBEQ	R8, $0, cmplengths
    37		CMP	R8, $256
    38		BLE	tail
    39	loop:
    40		CLC	$256, 0(R3), 0(R5)
    41		BGT	gt
    42		BLT	lt
    43		SUB	$256, R8
    44		MOVD	$256(R3), R3
    45		MOVD	$256(R5), R5
    46		CMP	R8, $256
    47		BGT	loop
    48	tail:
    49		SUB	$1, R8
    50		EXRL	$cmpbodyclc<>(SB), R8
    51		BGT	gt
    52		BLT	lt
    53	cmplengths:
    54		CMP	R4, R6
    55		BEQ	eq
    56		BLT	lt
    57	gt:
    58		MOVD	$1, 0(R7)
    59		RET
    60	lt:
    61		MOVD	$-1, 0(R7)
    62		RET
    63	eq:
    64		MOVD	$0, 0(R7)
    65		RET
    66	
    67	TEXT cmpbodyclc<>(SB),NOSPLIT|NOFRAME,$0-0
    68		CLC	$1, 0(R3), 0(R5)
    69		RET

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