| // Inferno's libkern/vlop-386.s |
| // https://bitbucket.org/inferno-os/inferno-os/src/master/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 |
