diff options
Diffstat (limited to 'sys/gnu/i386/fpemul/reg_norm.s')
| -rw-r--r-- | sys/gnu/i386/fpemul/reg_norm.s | 176 |
1 files changed, 0 insertions, 176 deletions
diff --git a/sys/gnu/i386/fpemul/reg_norm.s b/sys/gnu/i386/fpemul/reg_norm.s deleted file mode 100644 index f940327..0000000 --- a/sys/gnu/i386/fpemul/reg_norm.s +++ /dev/null @@ -1,176 +0,0 @@ -/* - * reg_norm.s - * - * Normalize the value in a FPU_REG. - * - * Call from C as: - * void normalize(FPU_REG *n) - * - * void normalize_nuo(FPU_REG *n) - * - * - * Copyright (C) 1992,1993,1994 - * W. Metzenthen, 22 Parker St, Ormond, Vic 3163, - * Australia. E-mail billm@vaxc.cc.monash.edu.au - * All rights reserved. - * - * This copyright notice covers the redistribution and use of the - * FPU emulator developed by W. Metzenthen. It covers only its use - * in the 386BSD, FreeBSD and NetBSD operating systems. Any other - * use is not permitted under this copyright. - * - * 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 include information specifying - * that source code for the emulator is freely available and include - * either: - * a) an offer to provide the source code for a nominal distribution - * fee, or - * b) list at least two alternative methods whereby the source - * can be obtained, e.g. a publically accessible bulletin board - * and an anonymous ftp site from which the software can be - * downloaded. - * 3. All advertising materials specifically mentioning features or use of - * this emulator must acknowledge that it was developed by W. Metzenthen. - * 4. The name of W. Metzenthen may not be used to endorse or promote - * products derived from this software without specific prior written - * permission. - * - * THIS SOFTWARE IS PROVIDED ``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 - * W. METZENTHEN 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. - * - * - * The purpose of this copyright, based upon the Berkeley copyright, is to - * ensure that the covered software remains freely available to everyone. - * - * The software (with necessary differences) is also available, but under - * the terms of the GNU copyleft, for the Linux operating system and for - * the djgpp ms-dos extender. - * - * W. Metzenthen June 1994. - * - * - * $FreeBSD$ - * - */ - - -#include <gnu/i386/fpemul/fpu_asm.h> - - -.text - -ENTRY(normalize) - pushl %ebp - movl %esp,%ebp - pushl %ebx - - movl PARAM1,%ebx - - movl SIGH(%ebx),%edx - movl SIGL(%ebx),%eax - - orl %edx,%edx /* ms bits */ - js L_done /* Already normalized */ - jnz L_shift_1 /* Shift left 1 - 31 bits */ - - orl %eax,%eax - jz L_zero /* The contents are zero */ - -/* L_shift_32: */ - movl %eax,%edx - xorl %eax,%eax - subl $32,EXP(%ebx) /* This can cause an underflow */ - -/* We need to shift left by 1 - 31 bits */ -L_shift_1: - bsrl %edx,%ecx /* get the required shift in %ecx */ - subl $31,%ecx - negl %ecx - shld %cl,%eax,%edx - shl %cl,%eax - subl %ecx,EXP(%ebx) /* This can cause an underflow */ - - movl %edx,SIGH(%ebx) - movl %eax,SIGL(%ebx) - -L_done: - cmpl EXP_OVER,EXP(%ebx) - jge L_overflow - - cmpl EXP_UNDER,EXP(%ebx) - jle L_underflow - -L_exit: - popl %ebx - leave - ret - - -L_zero: - movl EXP_UNDER,EXP(%ebx) - movb TW_Zero,TAG(%ebx) - jmp L_exit - -L_underflow: - push %ebx - call arith_underflow - pop %ebx - jmp L_exit - -L_overflow: - push %ebx - call arith_overflow - pop %ebx - jmp L_exit - - - -/* Normalise without reporting underflow or overflow */ -ENTRY(normalize_nuo) - pushl %ebp - movl %esp,%ebp - pushl %ebx - - movl PARAM1,%ebx - - movl SIGH(%ebx),%edx - movl SIGL(%ebx),%eax - - orl %edx,%edx /* ms bits */ - js L_exit /* Already normalized */ - jnz L_nuo_shift_1 /* Shift left 1 - 31 bits */ - - orl %eax,%eax - jz L_zero /* The contents are zero */ - -/* L_nuo_shift_32: */ - movl %eax,%edx - xorl %eax,%eax - subl $32,EXP(%ebx) /* This can cause an underflow */ - -/* We need to shift left by 1 - 31 bits */ -L_nuo_shift_1: - bsrl %edx,%ecx /* get the required shift in %ecx */ - subl $31,%ecx - negl %ecx - shld %cl,%eax,%edx - shl %cl,%eax - subl %ecx,EXP(%ebx) /* This can cause an underflow */ - - movl %edx,SIGH(%ebx) - movl %eax,SIGL(%ebx) - jmp L_exit - - |
