Text file src/runtime/vlop_386.s

     1	// Inferno's libkern/vlop-386.s
     2	// https://bitbucket.org/inferno-os/inferno-os/src/default/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.
    34	TEXT 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	
    49	TEXT 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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