github.com/xushiwei/go@v0.0.0-20130601165731-2b9d83f45bc9/src/pkg/runtime/vlop_386.s (about)

     1  // Inferno's libkern/vlop-386.s
     2  // http://code.google.com/p/inferno-os/source/browse/libkern/vlop-386.s
     3  //
     4  //         Copyright © 1994-1999 Lucent Technologies Inc.  All rights reserved.
     5  //         Revisions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com).  All rights reserved.
     6  //         Portions Copyright 2009 The Go Authors. All rights reserved.
     7  //
     8  // Permission is hereby granted, free of charge, to any person obtaining a copy
     9  // of this software and associated documentation files (the "Software"), to deal
    10  // in the Software without restriction, including without limitation the rights
    11  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    12  // copies of the Software, and to permit persons to whom the Software is
    13  // furnished to do so, subject to the following conditions:
    14  //
    15  // The above copyright notice and this permission notice shall be included in
    16  // all copies or substantial portions of the Software.
    17  //
    18  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    19  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    20  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
    21  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    22  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    23  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    24  // THE SOFTWARE.
    25  
    26  /*
    27   * C runtime for 64-bit divide.
    28   */
    29  
    30  TEXT _mul64by32(SB), 7, $0
    31  	MOVL	r+0(FP), CX
    32  	MOVL	a+4(FP), AX
    33  	MULL	b+12(FP)
    34  	MOVL	AX, 0(CX)
    35  	MOVL	DX, BX
    36  	MOVL	a+8(FP), AX
    37  	MULL	b+12(FP)
    38  	ADDL	AX, BX
    39  	MOVL	BX, 4(CX)
    40  	RET
    41  
    42  TEXT _div64by32(SB), 7, $0
    43  	MOVL	r+12(FP), CX
    44  	MOVL	a+0(FP), AX
    45  	MOVL	a+4(FP), DX
    46  	DIVL	b+8(FP)
    47  	MOVL	DX, 0(CX)
    48  	RET