Text file src/pkg/internal/bytealg/compare_mipsx.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	// +build mips mipsle
     6	
     7	#include "go_asm.h"
     8	#include "textflag.h"
     9	
    10	TEXT ·Compare(SB),NOSPLIT,$0-28
    11		MOVW	a_base+0(FP), R3
    12		MOVW	b_base+12(FP), R4
    13		MOVW	a_len+4(FP), R1
    14		MOVW	b_len+16(FP), R2
    15		BEQ	R3, R4, samebytes
    16		SGTU	R1, R2, R7
    17		MOVW	R1, R8
    18		CMOVN	R7, R2, R8	// R8 is min(R1, R2)
    19	
    20		ADDU	R3, R8	// R3 is current byte in a, R8 is last byte in a to compare
    21	loop:
    22		BEQ	R3, R8, samebytes
    23	
    24		MOVBU	(R3), R6
    25		ADDU	$1, R3
    26		MOVBU	(R4), R7
    27		ADDU	$1, R4
    28		BEQ	R6, R7 , loop
    29	
    30		SGTU	R6, R7, R8
    31		MOVW	$-1, R6
    32		CMOVZ	R8, R6, R8
    33		JMP	cmp_ret
    34	samebytes:
    35		SGTU	R1, R2, R6
    36		SGTU	R2, R1, R7
    37		SUBU	R7, R6, R8
    38	cmp_ret:
    39		MOVW	R8, ret+24(FP)
    40		RET
    41	
    42	TEXT runtime·cmpstring(SB),NOSPLIT,$0-20
    43		MOVW	a_base+0(FP), R3
    44		MOVW	a_len+4(FP), R1
    45		MOVW	b_base+8(FP), R4
    46		MOVW	b_len+12(FP), R2
    47		BEQ	R3, R4, samebytes
    48		SGTU	R1, R2, R7
    49		MOVW	R1, R8
    50		CMOVN	R7, R2, R8	// R8 is min(R1, R2)
    51	
    52		ADDU	R3, R8	// R3 is current byte in a, R8 is last byte in a to compare
    53	loop:
    54		BEQ	R3, R8, samebytes	// all compared bytes were the same; compare lengths
    55	
    56		MOVBU	(R3), R6
    57		ADDU	$1, R3
    58		MOVBU	(R4), R7
    59		ADDU	$1, R4
    60		BEQ	R6, R7 , loop
    61		// bytes differed
    62		SGTU	R6, R7, R8
    63		MOVW	$-1, R6
    64		CMOVZ	R8, R6, R8
    65		JMP	cmp_ret
    66	samebytes:
    67		SGTU	R1, R2, R6
    68		SGTU	R2, R1, R7
    69		SUBU	R7, R6, R8
    70	cmp_ret:
    71		MOVW	R8, ret+16(FP)
    72		RET

View as plain text