diff options
Diffstat (limited to 'lib/libc/i386/gen/fixunsdfsi.S')
| -rw-r--r-- | lib/libc/i386/gen/fixunsdfsi.S | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/lib/libc/i386/gen/fixunsdfsi.S b/lib/libc/i386/gen/fixunsdfsi.S new file mode 100644 index 0000000..f61daee --- /dev/null +++ b/lib/libc/i386/gen/fixunsdfsi.S @@ -0,0 +1,82 @@ +/*- + * Copyright (c) 1990 The Regents of the University of California. + * All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * William Jolitz. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * from: @(#)fixunsdfsi.s 5.1 12/17/90 + * $Id: fixunsdfsi.S,v 1.1 1993/12/05 13:01:03 ats Exp $ + */ + +#if defined(LIBC_SCCS) + .text + .asciz "$Id: fixunsdfsi.S,v 1.1 1993/12/05 13:01:03 ats Exp $" +#endif + +#include "DEFS.h" +#include "SYS.h" + +ENTRY(__fixunsdfsi) + fldl 4(%esp) /* argument double to accum stack */ + frndint /* create integer */ +#ifdef PIC + PIC_PROLOGUE + leal PIC_GOTOFF(fbiggestsigned),%eax + PIC_EPILOGUE + fcoml (%eax) +#else + fcoml PIC_GOTOFF(fbiggestsigned) /* bigger than biggest signed? */ +#endif + fstsw %ax + sahf + jnb 1f + + fistpl 4(%esp) + movl 4(%esp),%eax + ret + +1: +#ifdef PIC + PIC_PROLOGUE + leal PIC_GOTOFF(fbiggestsigned),%eax + PIC_EPILOGUE + fsubl (%eax) +#else + fsubl PIC_GOTOFF(fbiggestsigned) /* reduce for proper conversion */ +#endif + fistpl 4(%esp) /* convert */ + movl 4(%esp),%eax + orl $0x80000000,%eax /* restore bias */ + PIC_EPILOGUE + ret + +fbiggestsigned: .double 0r2147483648.0 |
