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Rev Author Line No. Line
2 - 1 
TEXT ptclbsum(SB), $0
2 
	MOVL	addr+0(FP), SI
3 
	MOVL	len+4(FP), CX
4 
 
5 
	XORL	AX, AX			/* sum */
6 
 
7 
	TESTL	$1, SI			/* byte aligned? */
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	MOVL	SI, DI
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	JEQ	_2align
10 
 
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	DECL	CX
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	JLT	_return
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14 
	MOVB	0x00(SI), AH
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	INCL	SI
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17 
_2align:
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	TESTL	$2, SI			/* word aligned? */
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	JEQ	_32loop
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	CMPL	CX, $2			/* less than 2 bytes? */
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	JLT	_1dreg
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	SUBL	$2, CX
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	XORL	BX, BX
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	MOVW	0x00(SI), BX
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	ADDL	BX, AX
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	ADCL	$0, AX
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	LEAL	2(SI), SI
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_32loop:
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	CMPL	CX, $0x20
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	JLT	_8loop
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	MOVL	CX, BP
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	SHRL	$5, BP
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	ANDL	$0x1F, CX
38 
 
39 
_32loopx:
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	MOVL	0x00(SI), BX
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	MOVL	0x1C(SI), DX
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	ADCL	BX, AX
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	MOVL	0x04(SI), BX
44 
	ADCL	DX, AX
45 
	MOVL	0x10(SI), DX
46 
	ADCL	BX, AX
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	MOVL	0x08(SI), BX
48 
	ADCL	DX, AX
49 
	MOVL	0x14(SI), DX
50 
	ADCL	BX, AX
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	MOVL	0x0C(SI), BX
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	ADCL	DX, AX
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	MOVL	0x18(SI), DX
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	ADCL	BX, AX
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	LEAL	0x20(SI), SI
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	ADCL	DX, AX
57 
 
58 
	DECL	BP
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	JNE	_32loopx
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61 
	ADCL	$0, AX
62 
 
63 
_8loop:
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	CMPL	CX, $0x08
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	JLT	_2loop
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	MOVL	CX, BP
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	SHRL	$3, BP
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	ANDL	$0x07, CX
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71 
_8loopx:
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	MOVL	0x00(SI), BX
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	ADCL	BX, AX
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	MOVL	0x04(SI), DX
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	ADCL	DX, AX
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	LEAL	0x08(SI), SI
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	DECL	BP
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	JNE	_8loopx
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81 
	ADCL	$0, AX
82 
 
83 
_2loop:
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	CMPL	CX, $0x02
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	JLT	_1dreg
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	MOVL	CX, BP
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	SHRL	$1, BP
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	ANDL	$0x01, CX
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91 
_2loopx:
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	MOVWLZX	0x00(SI), BX
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	ADCL	BX, AX
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95 
	LEAL	0x02(SI), SI
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	DECL	BP
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	JNE	_2loopx
98 
 
99 
	ADCL	$0, AX
100 
 
101 
_1dreg:
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	TESTL	$1, CX			/* 1 byte left? */
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	JEQ	_fold
104 
 
105 
	XORL	BX, BX
106 
	MOVB	0x00(SI), BX
107 
	ADDL	BX, AX
108 
	ADCL	$0, AX
109 
 
110 
_fold:
111 
	MOVL	AX, BX
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	SHRL	$16, BX
113 
	JEQ	_swab
114 
 
115 
	ANDL	$0xFFFF, AX
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	ADDL	BX, AX
117 
	JMP	_fold
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_swab:
120 
	TESTL	$1, addr+0(FP)
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	/*TESTL	$1, DI*/
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	JNE	_return
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	XCHGB	AH, AL
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_return:
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	RET