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| // Inferno's libkern/vlop-386.s
| // https://bitbucket.org/inferno-os/inferno-os/src/default/libkern/vlop-386.s
| //
| // Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved.
| // Revisions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com). All rights reserved.
| // Portions Copyright 2009 The Go Authors. All rights reserved.
| //
| // Permission is hereby granted, free of charge, to any person obtaining a copy
| // of this software and associated documentation files (the "Software"), to deal
| // in the Software without restriction, including without limitation the rights
| // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
| // copies of the Software, and to permit persons to whom the Software is
| // furnished to do so, subject to the following conditions:
| //
| // The above copyright notice and this permission notice shall be included in
| // all copies or substantial portions of the Software.
| //
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
| // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
| // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
| // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
| // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
| // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
| // THE SOFTWARE.
|
| #include "textflag.h"
|
| /*
| * C runtime for 64-bit divide.
| */
|
| // runtime·_mul64x32(lo64 *uint64, a uint64, b uint32) (hi32 uint32)
| // sets *lo64 = low 64 bits of 96-bit product a*b; returns high 32 bits.
| TEXT runtime·_mul64by32(SB), NOSPLIT, $0
| MOVL lo64+0(FP), CX
| MOVL a_lo+4(FP), AX
| MULL b+12(FP)
| MOVL AX, 0(CX)
| MOVL DX, BX
| MOVL a_hi+8(FP), AX
| MULL b+12(FP)
| ADDL AX, BX
| ADCL $0, DX
| MOVL BX, 4(CX)
| MOVL DX, AX
| MOVL AX, hi32+16(FP)
| RET
|
| TEXT runtime·_div64by32(SB), NOSPLIT, $0
| MOVL r+12(FP), CX
| MOVL a_lo+0(FP), AX
| MOVL a_hi+4(FP), DX
| DIVL b+8(FP)
| MOVL DX, 0(CX)
| MOVL AX, q+16(FP)
| RET
|
|
