5261 libm should stop using synonyms.h
5298 fabs is 0-sized, confuses dis(1) and others
Reviewed by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
Approved by: Gordon Ross <gwr@nexenta.com>

          --- old/usr/src/lib/libm/i386/src/ilogbl.s
          +++ new/usr/src/lib/libm/i386/src/ilogbl.s

   1    1  /*
   2    2   * CDDL HEADER START
   3    3   *
   4    4   * The contents of this file are subject to the terms of the
   5    5   * Common Development and Distribution License (the "License").
   6    6   * You may not use this file except in compliance with the License.
   7    7   *
   8    8   * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9    9   * or http://www.opensolaris.org/os/licensing.
  10   10   * See the License for the specific language governing permissions
  11   11   * and limitations under the License.
  12   12   *
  13   13   * When distributing Covered Code, include this CDDL HEADER in each
  14   14   * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15   15   * If applicable, add the following below this CDDL HEADER, with the
  16   16   * fields enclosed by brackets "[]" replaced with your own identifying
  17   17   * information: Portions Copyright [yyyy] [name of copyright owner]
  18   18   *
  19   19   * CDDL HEADER END
  20   20   */
  21   21  /*
  22   22   * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.

  23   23   */
  24   24  /*
  25   25   * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
  26   26   * Use is subject to license terms.
  27   27   */
  28   28  
  29   29          .file "ilogbl.s"
  30   30  
  31   31  #include "libm.h"
  32   32  LIBM_ANSI_PRAGMA_WEAK(ilogbl,function)
  33      -#include "libm_synonyms.h"
  34   33  #include "xpg6.h"
  35   34  
  36   35          .data
  37   36          .align  8
  38   37  two63:  .long   0x0,0x43d00000          / 2**63
  39   38  
  40   39          ENTRY(ilogbl)
  41   40          movl    12(%esp),%eax           / eax <-- sign and bexp of x
  42   41          andl    $0x00007fff,%eax        / eax <-- bexp(x)
  43   42          jz      .bexp_0                 / jump iff x is 0 or subnormal

  44   43                                          / here, biased exponent is non-zero
  45   44          testl   $0x80000000,8(%esp)     / test msb of hi_32(sgnfcnd(x))
  46   45          jz      .ilogbl_not_finite      / jump if unsupported format
  47   46          cmpl    $0x00007fff,%eax
  48   47          je      .ilogbl_not_finite
  49   48          subl    $16383,%eax             / unbias exponent by 16383 = 0x3fff
  50   49          ret
  51   50  
  52   51  .ilogbl_not_finite:
  53   52          movl    $0x7fffffff,%eax        / x is NaN/inf/unsup
  54   53          jmp     0f
  55   54  
  56   55  .bexp_0:
  57   56          movl    8(%esp),%eax            / eax <-- hi_32(sgnfcnd(x))
  58   57          orl     4(%esp),%eax            / test whether x is 0
  59   58          jnz     .ilogbl_subnorm         / jump iff x is subnormal
  60   59          movl    $0x80000001,%eax        / x is +/-0, so return 0x80000001
  61   60  0:
  62   61          PIC_SETUP(0)
  63   62          PIC_G_LOAD(movzwl,__xpg6,ecx)
  64   63          PIC_WRAPUP
  65   64          andl    $_C99SUSv3_ilogb_0InfNaN_raises_invalid,%ecx
  66   65          cmpl    $0,%ecx
  67   66          je      1f
  68   67          fldz
  69   68          fdivp   %st,%st(0)              / raise invalid as per SUSv3
  70   69  1:
  71   70          ret
  72   71  
  73   72  
  74   73  .ilogbl_subnorm:                        / subnormal or pseudo-denormal input
  75   74          fldt    4(%esp)                 / push x, setting D-flag
  76   75          PIC_SETUP(1)
  77   76          fmull   PIC_L(two63)            / x*2**63
  78   77          PIC_WRAPUP
  79   78          subl    $12,%esp
  80   79          fstpt   (%esp)
  81   80          movl    $0x00007fff,%eax
  82   81          andl    8(%esp),%eax            / eax <-- sign and bexp of x*2**63
  83   82          subl    $16445,%eax             / unbias it by (16,383 + 63)
  84   83          addl    $12,%esp
  85   84          ret
  86   85          .align  4
  87   86          SET_SIZE(ilogbl)

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