vlop_386.s

Documentation: runtime

     1// Inferno's libkern/vlop-386.s
     2// https://bitbucket.org/inferno-os/inferno-os/src/master/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#include "textflag.h"
    27
    28/*
    29 * C runtime for 64-bit divide.
    30 */
    31
    32// runtime·_mul64x32(lo64 *uint64, a uint64, b uint32) (hi32 uint32)
    33// sets *lo64 = low 64 bits of 96-bit product a*b; returns high 32 bits.
    34TEXT runtime·_mul64by32(SB), NOSPLIT, $0
    35	MOVL	lo64+0(FP), CX
    36	MOVL	a_lo+4(FP), AX
    37	MULL	b+12(FP)
    38	MOVL	AX, 0(CX)
    39	MOVL	DX, BX
    40	MOVL	a_hi+8(FP), AX
    41	MULL	b+12(FP)
    42	ADDL	AX, BX
    43	ADCL	$0, DX
    44	MOVL	BX, 4(CX)
    45	MOVL	DX, AX
    46	MOVL	AX, hi32+16(FP)
    47	RET
    48
    49TEXT runtime·_div64by32(SB), NOSPLIT, $0
    50	MOVL	r+12(FP), CX
    51	MOVL	a_lo+0(FP), AX
    52	MOVL	a_hi+4(FP), DX
    53	DIVL	b+8(FP)
    54	MOVL	DX, 0(CX)
    55	MOVL	AX, q+16(FP)
    56	RET
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