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 57
