| | 1 | /* $NetBSD: s_modf.S,v 1.1 2006/03/22 20:45:58 drochner Exp $ */ |
| | 2 | |
| | 3 | /*- |
| | 4 | * Copyright (c) 1990 The Regents of the University of California. |
| | 5 | * All rights reserved. |
| | 6 | * |
| | 7 | * This code is derived from software contributed to Berkeley by |
| | 8 | * Sean Eric Fagan. |
| | 9 | * |
| | 10 | * Redistribution and use in source and binary forms, with or without |
| | 11 | * modification, are permitted provided that the following conditions |
| | 12 | * are met: |
| | 13 | * 1. Redistributions of source code must retain the above copyright |
| | 14 | * notice, this list of conditions and the following disclaimer. |
| | 15 | * 2. Redistributions in binary form must reproduce the above copyright |
| | 16 | * notice, this list of conditions and the following disclaimer in the |
| | 17 | * documentation and/or other materials provided with the distribution. |
| | 18 | * 3. Neither the name of the University nor the names of its contributors |
| | 19 | * may be used to endorse or promote products derived from this software |
| | 20 | * without specific prior written permission. |
| | 21 | * |
| | 22 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| | 23 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| | 24 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| | 25 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| | 26 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| | 27 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| | 28 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| | 29 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| | 30 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| | 31 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| | 32 | * SUCH DAMAGE. |
| | 33 | * |
| | 34 | * from: @(#)modf.s 5.5 (Berkeley) 3/18/91 |
| | 35 | */ |
| | 36 | |
| | 37 | #include <machine/asm.h> |
| | 38 | |
| | 39 | /* |
| | 40 | * modf(value, iptr): return fractional part of value, and stores the |
| | 41 | * integral part into iptr (a pointer to double). |
| | 42 | * |
| | 43 | * Written by Sean Eric Fagan (sef@kithrup.COM) |
| | 44 | * Sun Mar 11 20:27:30 PST 1990 |
| | 45 | */ |
| | 46 | |
| | 47 | /* With CHOP mode on, frndint behaves as TRUNC does. Useful. */ |
| | 48 | ENTRY(modf) |
| | 49 | #ifdef __x86_64__ |
| | 50 | pushq %rbp |
| | 51 | movq %rsp,%rbp |
| | 52 | subq $24,%rsp |
| | 53 | |
| | 54 | /* Set chop mode. */ |
| | 55 | fnstcw -12(%rbp) |
| | 56 | movw -12(%rbp),%dx |
| | 57 | orw $3072,%dx |
| | 58 | movw %dx,-16(%rbp) |
| | 59 | fldcw -16(%rbp) |
| | 60 | |
| | 61 | /* Get integral part. */ |
| | 62 | movsd %xmm0,-24(%rbp) |
| | 63 | fldl -24(%rbp) |
| | 64 | frndint |
| | 65 | fstpl -8(%rbp) |
| | 66 | |
| | 67 | /* Restore control word. */ |
| | 68 | fldcw -12(%rbp) |
| | 69 | |
| | 70 | /* Store integral part. */ |
| | 71 | movsd -8(%rbp),%xmm0 |
| | 72 | movsd %xmm0,(%rdi) |
| | 73 | |
| | 74 | /* Get fractional part and return it. */ |
| | 75 | fldl -24(%rbp) |
| | 76 | fsubl -8(%rbp) |
| | 77 | fstpl -24(%rbp) |
| | 78 | movsd -24(%rbp),%xmm0 |
| | 79 | #else |
| | 80 | pushl %ebp |
| | 81 | movl %esp,%ebp |
| | 82 | subl $16,%esp |
| | 83 | fnstcw -12(%ebp) |
| | 84 | movw -12(%ebp),%dx |
| | 85 | orw $3072,%dx |
| | 86 | movw %dx,-16(%ebp) |
| | 87 | fldcw -16(%ebp) |
| | 88 | fldl 8(%ebp) |
| | 89 | frndint |
| | 90 | fstpl -8(%ebp) |
| | 91 | fldcw -12(%ebp) |
| | 92 | movl 16(%ebp),%eax |
| | 93 | movl -8(%ebp),%edx |
| | 94 | movl -4(%ebp),%ecx |
| | 95 | movl %edx,(%eax) |
| | 96 | movl %ecx,4(%eax) |
| | 97 | fldl 8(%ebp) |
| | 98 | fsubl -8(%ebp) |
| | 99 | jmp L1 |
| | 100 | L1: |
| | 101 | #endif |
| | 102 | leave |
| | 103 | ret |
| | 104 | END(modf) |
| | 105 | |
| | 106 | .section .note.GNU-stack,"",%progbits |
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