github.com/bir3/gocompiler@v0.9.2202/src/internal/bytealg/indexbyte_riscv64.s (about)

     1  // Copyright 2019 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 ·IndexByte<ABIInternal>(SB),NOSPLIT,$0-40
     9  	// X10 = b_base
    10  	// X11 = b_len
    11  	// X12 = b_cap (unused)
    12  	// X13 = byte to find
    13  	AND	$0xff, X13
    14  	MOV	X10, X12		// store base for later
    15  	ADD	X10, X11		// end
    16  	SUB	$1, X10
    17  
    18  loop:
    19  	ADD	$1, X10
    20  	BEQ	X10, X11, notfound
    21  	MOVBU	(X10), X14
    22  	BNE	X13, X14, loop
    23  
    24  	SUB	X12, X10		// remove base
    25  	RET
    26  
    27  notfound:
    28  	MOV	$-1, X10
    29  	RET
    30  
    31  TEXT ·IndexByteString<ABIInternal>(SB),NOSPLIT,$0-32
    32  	// X10 = b_base
    33  	// X11 = b_len
    34  	// X12 = byte to find
    35  	AND	$0xff, X12
    36  	MOV	X10, X13		// store base for later
    37  	ADD	X10, X11		// end
    38  	SUB	$1, X10
    39  
    40  loop:
    41  	ADD	$1, X10
    42  	BEQ	X10, X11, notfound
    43  	MOVBU	(X10), X14
    44  	BNE	X12, X14, loop
    45  
    46  	SUB	X13, X10		// remove base
    47  	RET
    48  
    49  notfound:
    50  	MOV	$-1, X10
    51  	RET